evaluation of insulin resistance and metabolic syndrome in patients with polycystic ovary syndrome
TRANSCRIPT
REVIEW PAPER
Evaluation of insulin resistance and metabolic syndrome in patientswith polycystic ovary syndrome
MAHNAZ LANKARANI1 NEDA VALIZADEH1 RAMIN HESHMAT1
MARYAM PEIMANI1 amp FARNAZ SOHRABVAND2
1Endocrinology and metabolism Research Center Tehran University of Medical Sciences Tehran Iran and 2Obstetrics and
Gynecology Department Vallie-Asr Hospital Imam Khomeini Medical Center Tehran Iran
(Received 14 December 2008 revised 31 March 2009 accepted 6 April 2009)
AbstractAim Polycystic ovary syndrome (PCOS) is associated with the clustering of states including insulin resistance (IR) obesityelevated blood pressure and dyslipidemia that are termed as metabolic syndrome (MBS) This study was designed to assessthe differences between homeostatic model assessment (HOMA) values in PCOS and healthy womenMethods In a casendashcontrol study 55 women with PCOS and 59 women with normal cycles (control group) aged 15ndash40years old were evaluated In all the subjects (after obtaining written informed consent) blood pressure body weight heightbody mass index (BMI) waist hip ratio(WHR) and fasting blood glucose (FBG) triglycerides (TG) HDL C-peptideinsulin HOMA Index and FGIR (fasting glucose to insulin ratio) were measuredResults In this study the prevalence of MBS was significantly higher in PCOS group compared with the control group(pfrac14 0028) There were no significant differences in age waisthip ratio fasting glucose insulin and C-peptide levelsbetween patients with PCOS and control group Furthermore the prevalence of impaired fasting glucose (IFG) and themean of HOMA and FGIR did not differ significantly between PCOS and control groupConclusion Criteria of MBS are frequently present in young women with PCOS and may be more useful as a prognosticfactor than IR indexes in this age group We suggest evaluation of IR in older age women with PCOS
Keywords Polycystic ovary syndrome insulin resistance HOMA index metabolic syndrome
Introduction
Polycystic ovary syndrome (PCOS) is a common
medical condition that is manifested by oligoanovou-
lation and hyperandrogenemia The exact pathogen-
esis of this heterogenous disorder has not yet been
clarified The condition is usually associated with
insulin resistance (IR) reflected by hyperinsulinemia
Subjects with PCOS have androgen excess secondary
to the insulin influences in diminishing sex hormone
binding globulin (SHBG) synthesis and also enhance-
ment of androgen production by ovarian tissue [1] IR
is a main factor in the pathogenesis of metabolic
syndrome (MBS) [2] PCOS is associated with the
clustering of states [including IR obesity elevated
blood pressure (BP) and unfavorable lipid profile]
that is termed MBS [3] Hyperinsulinemia as a
consequence of severe IR aggravates the reproductive
disorders in PCOS [4] It has been described that
IR promotes PCOS elevated BP and dyslipidemia
[5] Currently homeostatic model assessment
(HOMA) score that applies fasting glucose and
insulin levels has been used by investigators to
determine IR [6] Detection of IR in women with
PCOS may be beneficial for management by insulin
sensitizer agents such as metformin to decrease
insulin levels [4] This study was designed to
determine the differences between HOMA values
in women with PCOS and healthy women without
PCOS We also investigated the differences between
FGIRs in these two groups
Subjects and methods
In a casendashcontrol study 55 women with PCOS from
the endocrine and gynecology clinics of Shariati
Correspondence Neda Valizadeh Endocrinology and Metabolism Research Center 5th floor Shariati Hospital North Kargar Avenue Tehran Iran
Tel thorn9821-88026902 Fax thorn9821-88029399 E-mail neda_valizadeh2003yahoocom
Gynecological Endocrinology August 2009 25(8) 504ndash507
ISSN 0951-3590 printISSN 1473-0766 online ordf 2009 Informa UK Ltd
DOI 10108009513590902972083
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Hospital and 59 women with normal cycles (control
group) aged 15ndash40 year old were evaluated Diag-
nosis of PCOS was based on the criteria adopted at
the 1990 National Institute of Child Health and
Human Development conference on PCOS [7]
PCOS was defined as having oligoanovoulation with
hyperandrogenism Other causes of hyperandrogen-
ism such as adult onset congenital adrenal hyperpla-
sia hyperprolactinemia and androgen secreting
tumors were ruled out Control healthy women were
selected among the patientsrsquo visitors medical stu-
dents and hospital workers Subjects that were
taking any agents that influence on hormonal profile
or glucose metabolism (oral contraceptive agents
glucocorticoids thiazides and metformin) in the last
3 months before beginning of the study were
excluded Written informed consent was obtained
from all participants before beginning the study
protocol Control women were matched for age to
the women with PCOS We measured body
weight height body mass index (BMI) waisthip
ratio (WHR) and blood pressure in all subjects
Samples of venous blood were obtained in the
morning after 12 h of fasting for measuring fasting
blood glucose (FBG) triglycerides (TG) HDL
C-peptide and insulin The concentrations of
FBG TG and HDL were analyzed by enzymatic
assay and radioimmunoassay (RIA) was used for
insulin and C-peptide
MBS was defined (based on the guidelines from
the 2005 National Cholesterol Education program
[Adult Treatment Panel ATP III]) as the presence of
at least three of the following criteria
Abdominal obesity (a waist circumference greater
than 88 cm in women)
Serum TG 150 mgdl or taking any medication
for hypertriglyceridemia
Serum HDL5 50 mgdl or taking any medica-
tion for reduced HDL level
BP 130 85 mmHg or taking any medication
for hypertension
Fasting blood glucose100 mgdl or taking any
medication for hyperglycemia [8]
We use HOMA and FGIR for comparing of IR
between PCOS and control women [9]
The FGIR was calculated with fasting glucose (in
milligrams per deciliter) divided by fasting insulin (in
micro units per milliliter)
HOMA was assessed using the following formula
[9]
HOMA frac14 frac12Fasting insulin ethmU=mlTHORN Fasting glucoseethmmol=literTHORN=225
Impaired fasting glucose was defined as FBS100 mgdl but125 mgdl and the diagnosis of
diabetes mellitus (DM) was made as FBS126 mg
dl [10]
Data were analyzed by MannndashWhitney U-test T-
test Fisherrsquos exact test and w2 test using the
statistical package SPSS version 115 The level of
statistical significance was considered as p5 005
Results
The demographic characteristics and biochemical
parameters of the PCOS and control women are
demonstrated in Table I
Intentionally there was no significant difference in
age between two groups WHRs and BMIs were
significantly higher in the women with PCOS than in
the control women (Table I)
There were no statistically significant differences in
fasting glucose insulin and C-peptide levels be-
tween patients with PCOS and healthy women
(Table I) The prevalence of IFG was 55 and
68 in PCOS and healthy women respectively
(pfrac14 100) The prevalence of the IFG did not differ
significantly between the two groups None of the
subjects had the diabetes mellitus
The mean HOMA Index did not differ signifi-
cantly between PCOS and control women
294+ 125 vs 298+ 110 respectively (Values
are mean+SD pfrac14 0569)
The mean of FGIR did not differ significantly
between the PCOS and the control women
691+ 449 vs 619+ 295 respectively (Values
are mean+SD pfrac14 0213)
Prevalence of the NCEP ATP III-defined MBS
was 127 in women with PCOS (7 of 55 patients)
in comparison with 17 (1 of 59) in control women
(Table II) The prevalence of MBS was significantly
higher in the PCOS group compared to the control
group (pfrac14 0028)
Discussion
PCOS is the most frequent endocrinopathy in
childbearing females Many of these patients tend
to have high insulin levels due to IR Affected
Table I Demographic characteristics and biochemical parameters
of subjects
Parameter PCOS (nfrac1455) Controls (nfrac1459) p-value
Age(years) 2375+ 526 2449+540 0457
BMI (kgm2) 2493+ 532 2156+256 0001
Waisthip ratio 079+ 007 076+004 0007
Fasting glucose
(mgdl)
8166+ 1153 7971+915 0318
Fasting insulin
(ngdl)
058+ 022 060+021 0577
C-peptide (ngdl) 281+ 161 294+163 0611
Values are means+SD
Insulin resistance in PCOS 505
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patients also have higher prevalence of glucose
intolerance type II DM and MBS contributing to
greater risk for cardiovascular complications in these
patients [23]
On the basis of our findings although fasting
insulin in PCOS was higher than in control group
there were no statistically significant differences in
fasting glucose and fasting insulin In the study by
Legro et al fasting glucose levels did not differ
between PCOS and control women but women with
PCOS had significantly higher fasting insulin levels
than control group [4]
Robinson et al reported that fasting glucose values
did not differ between PCOS and weight-matched
controls but the plasma glucose area that was
assessed by applying oral glucose (75 g) was greater
in the lean and obese women with PCOS than in the
controls [11]
In the study by Vrbıkova et al both lean and obese
European women with PCOS had significantly
greater levels of basal glucose and fasting insulin in
comparison with the control group [12]
In our study the prevalence of MBS was 127 in
women with PCOS and low HDL cholesterol were
the most frequent criteria of MBS (818 )
Apridonize et al [2] reported that in 106 women
with PCOS the prevalence of MBS was 43 and
low HDL cholesterol had higher frequency than
other criteria of MBS (68) [13] Park et al referred
in their article to a German study by Hahn et al that
have shown 31 of patients with PCOS had MBS
and the most common component of MBS was high
waist circumference [13] Apridonize et al in their
study demonstrated that in PCOS subjects MBS
rate was approximately two times greater than in age-
matched controls They also demonstrated that
higher rate of the MBS in women with PCOS is
independent of age and BMI [2] In our patients the
prevalence of MBS is less common but significantly
higher than in the healthy women
Some investigators have pointed out that the
greater rates of the MBS in PCOS may be linked to
the greater rates of obesity in them [14] Some
studies have obtained the same results but others
have reported that higher rates of MBS in women
with PCOS are independent of age and obesity [2]
Based on the present study HOMA did not differ
between PCOS and control women In the study by
Kurioka et al (2007) there were not significant
differences in HOMA values between Japanese
PCOS and controls Moreover HOMA values
differed significantly between obese and normal
body-weighted patients but in the normal body-
weighted subjects HOMA tests did not differ in
PCOS women and controls [15] However
DeUgarte et al study showed that the mean adjusted
HOMA (with the race age and BMI) was higher in
women with PCOS compared with control women
In their study 644 of patients with PCOS had a
HOMA value above the normal ranges [16] Despite
the fact that in our study the patients with PCOS had
higher BMIs than controls the mean of HOMA or
FGIR were similar in these two groups
In the study by Kauffman et al the means of BMI
fasting insulin and HOMA were significantly higher
in Mexican American women with PCOS in com-
parison with white women but the former group had
significantly lower mean FGIRs than the later group
Kauffman et al considered HOMA value greater
than 38 and 45 in white women and Mexican
American women respectively for detecting IR in
their patients They pointed that cut off values for
detecting of IR in the PCOS is influenced by the race
and ethnicity [17]
In the study by DeUgarte et al in patients with
PCOS HOMA has a positive correlation with BMI
but did not significantly depend on race or age
Within controls HOMA depended significantly on
age BMI and race (black patients had more IR than
whites) [16] Fulghesu et al showed the failure of the
HOMA score for exhibiting metabolic abnormalities
in young adolescent patients with PCOS They
described that a normal HOMA score is not
sufficient to exclude early metabolic abnormalities
such as hyperinsulinemia in young normal-weight
patients with PCOS On the other hand HOMA
values cannot detect the prevalence of hyperinsuli-
nemia in young normal-weight patients with PCOS
In their study 18 of patients had IR by applying
HOMA test but 44 of patients were hyperinsuli-
nemic based on the assessment by euglycemic
glucose clamp test [6] Like in the study of Fulghesu
and coworkers in our study women with PCOS
were young and the failure of present study in
detection of difference in HOMA values between
PCOS and controls may be due to the young age of
patients However Bahrami reported that the pre-
valences of IGT and type 2 DM were significantly
higher in both obese and non-obese young women
with PCOS (mean age 24+ 6 years) He recom-
mended screening of all patients with PCOS for IGT
and DM [18] In a study by Sheikholeslami et al in
Table II The prevalence for each component of metabolic
syndrome
Parameter
in PCOS
(nfrac1455)
in
Controls
(nfrac1459) p-value
Waist4 88( cm) 255 (14) 51 (3) 0002
TG150 (mgdl) 309 (17) 68 (4) 0001
HDL5 50 (mgdl) 818 (45) 797 (47) 0771
BP 13085 (mmHg) 73 (4) 0 0051
Sys BP130 (mmHg) 36 (2) 0 0231
Dia BP 85 (mmHg) 36 (2) 0 0231
Fasting Glu 100 (mgdl) 55 (3) 68(4) 100
Metabolic syn 127 (7) 17 (1) 0028
506 M Lankarani et al
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Iran women with PCOS (mean age 312+ 37
years) had higher basal insulin HOMA scores and
FBS in comparison with women with idiopathic
hirsutism [19]
Several studies have failed in documentation of the
link between IR and PCOS particularly in lean
subjects Cibula has explained that it may be arising
from different ethnicity andor lifestyle modifications
in women with PCOS [20]
Previous studies have exhibited that patients with
PCOS have a detrimental lipid profile including high
LDL and TG and low HDL levels [3] Insulin excess
inhibits lipolysis and leads to elevation of non-
esterified fatty acids levels that in turn contributes
to hypertriglyceridemia and decreased HDL levels
[3] In our study the prevalence of TG4 150 mgdl
was significantly higher in PCOS than in the control
group but there was no significant difference in the
occurrence of HDL5 50 between two groups
Small sample size is one of the limitations of this
study Another limitation is focusing the study on
young patients with PCOS Future studies with
larger sample size and older age group of PCOS
women seem reasonable
Conclusions
In our study HOMA and FGIR were not signifi-
cantly different in young PCOS and healthy women
but MBS was significantly more common in women
with PCOS The conflicts between different studies
in regard to IR in PCOS may be related to different
age groups ethnicity and lifestyle modifications in
various geographic regions Criteria of MBS are
frequently seen in Iranian young women with PCOS
MBS might be more useful as a prognostic factor
than IR indexes in this young age group Further
surveillance of MBS in women with PCOS will be
required We also suggest evaluation of IR by using
HOMA and FGIR tests in older age group of patients
with PCOS
Acknowledgements
This study was supported by Endocrinology and
Metabolism Research Center of Tehran University of
Medical Science in Iran
References
1 Legro RS Azziz R Ehrmann D Fereshetian AG Orsquokeefe M
Ghazzi MN Minimal response of circulating lipids in women
with polycystic ovary syndrome to improvement in insulin
sensitivity with troglitazone J Clin Endocr Metab 2003
885137ndash5144
2 Apridonidze T Essah PA Iuorno MJ Nestler JE Prevalence
and characteristics of the metabolic syndrome in women with
polycystic ovary syndrome J Clin Endocr Metab 200590
1929ndash1935
3 Leo VD Marca AL Petraglia F Insulin ndash lowering Agents in
the management of polycystic overy syndrome Endocr Rev
200324633ndash667
4 Legro RS Finegood D Dunaif A A fasting glucose to insulin
ratio is a useful measure of insulin sensitivity in women with
polycystic ovary syndrome J Clin Endocr Metab 199883
2694ndash2698
5 Flier JS Insulin resistance the metabolic syndrome X New
Engl J Med 19993411402
6 Fulghesu AM Angioni S Portoghese E Milano F Batetta B
Paoletti AM Melis GB Failures of the homeostatic model
assessment calculation score for detecting metabolic deteriora-
tion in young patients with polycystic ovary syndrome Fertil
Steril 200686398ndash404
7 Zawadzki JK Dunaif A Diagnostic criteria for polycystic
ovary syndrome towards a rational approach In Dunaif A
Givens JR Haseltine F Merriam GM editors Polycystic
ovary syndrome Boston Black well scientific 1992 pp 377ndash
384
8 Grundy SM Cleeman JI Daniels SR Donato KA Eckel RH
Franklin BA Gordon DJ Krauss RM Savage PJ Smith SC Jr
et al Diagnosis and management of the metabolic syndrome
an American Heart AssociationNational Heart Lung and
Blood Institute Scientific Statement Circulation 2005112
2735
9 Lergo RS Castracane VD Kauffman RP Detecting insulin
resistance in polycystic ovary syndrome purposes and pitfalls
Obstet Gynecol Surv 200459141ndash154
10 Genuth S Alberti KG Bennett P Follow-up report on the
diagnosis of diabetes mellitus Diabetes care 2003263160
11 Robinson S Henderson AD Gelding SV Kiddy D
Niththyananthan R Bush A Richmond W Johnston DG
Franks S Dyslipidemia is associated with insulin resistance in
women polycystic ovaries Clin Endocrinol 199644277ndash284
12 Vrbikova J Cibula D Dvorakova K Stanicka S Sindelka G
Hill M Fanta M Vondra K Skrha J Insulin Sensitivity in
women with polycystic ovary syndrome J Clin Endocr Metab
2004892942ndash2945
13 Park HR Choi Y Lee HJ Oh JY Hong YS Sung YA The
metabolic syndrome in young Korean women with polycystic
ovary syndrome Diabetes Res Clin PR 200777SS243ndashS246
Available online at wwwsciencedirectcom
14 Cussons AJ Stuckey BGA watts GF Metabolic and
cardiovascular risk in the polycystic ovary syndrome Pract
Diabetes Int 200522261ndash265
15 Kurioka H Takahashi K Miyazaki K Glucose intolerance in
japanese patients with polycystic ovary syndrome Arch
Gynecol Obstet 2007275169ndash173
16 DeUgarte CM Bartolucci AA Azziz R Prevalence of
insulin resistance in the polycystic ovary syndrome using the
homeostasis model assessment Fertil Steril 2005831454ndash
1460
17 Kauffman RP Baker VM DiMarino P Gimpel T castracane
VD Polycystic ovarian syndrome and insulin resistance in
white and Mexican American women a comparison of two
distinct populations Am J Obstet Gynecol 20021871362ndash
1369
18 Bahrami A Evaluation of impaired glucose tolerance and type
2 diabetes mellitus prevalence in PCOS and necessity for
screening in patients with PCOS Iran J Diabetes Lipid
Disord Spring Summer 20043141ndash148
19 Sheikholeslami H Mirdamadi M Ziaee A Kani C Insulin
resistance in patients with polycystic ovary syndrome In
European congress of endocrinology 2008 May 3ndash7 Berlin
Germany Bioscientifica publishers Endocrine Abstracts
(2008) 16 P648
20 Cibula D Is insulin resistance an essential component of
PCOS The influence of confounding factors Hum Reprod
200419757ndash759
Insulin resistance in PCOS 507
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Hospital and 59 women with normal cycles (control
group) aged 15ndash40 year old were evaluated Diag-
nosis of PCOS was based on the criteria adopted at
the 1990 National Institute of Child Health and
Human Development conference on PCOS [7]
PCOS was defined as having oligoanovoulation with
hyperandrogenism Other causes of hyperandrogen-
ism such as adult onset congenital adrenal hyperpla-
sia hyperprolactinemia and androgen secreting
tumors were ruled out Control healthy women were
selected among the patientsrsquo visitors medical stu-
dents and hospital workers Subjects that were
taking any agents that influence on hormonal profile
or glucose metabolism (oral contraceptive agents
glucocorticoids thiazides and metformin) in the last
3 months before beginning of the study were
excluded Written informed consent was obtained
from all participants before beginning the study
protocol Control women were matched for age to
the women with PCOS We measured body
weight height body mass index (BMI) waisthip
ratio (WHR) and blood pressure in all subjects
Samples of venous blood were obtained in the
morning after 12 h of fasting for measuring fasting
blood glucose (FBG) triglycerides (TG) HDL
C-peptide and insulin The concentrations of
FBG TG and HDL were analyzed by enzymatic
assay and radioimmunoassay (RIA) was used for
insulin and C-peptide
MBS was defined (based on the guidelines from
the 2005 National Cholesterol Education program
[Adult Treatment Panel ATP III]) as the presence of
at least three of the following criteria
Abdominal obesity (a waist circumference greater
than 88 cm in women)
Serum TG 150 mgdl or taking any medication
for hypertriglyceridemia
Serum HDL5 50 mgdl or taking any medica-
tion for reduced HDL level
BP 130 85 mmHg or taking any medication
for hypertension
Fasting blood glucose100 mgdl or taking any
medication for hyperglycemia [8]
We use HOMA and FGIR for comparing of IR
between PCOS and control women [9]
The FGIR was calculated with fasting glucose (in
milligrams per deciliter) divided by fasting insulin (in
micro units per milliliter)
HOMA was assessed using the following formula
[9]
HOMA frac14 frac12Fasting insulin ethmU=mlTHORN Fasting glucoseethmmol=literTHORN=225
Impaired fasting glucose was defined as FBS100 mgdl but125 mgdl and the diagnosis of
diabetes mellitus (DM) was made as FBS126 mg
dl [10]
Data were analyzed by MannndashWhitney U-test T-
test Fisherrsquos exact test and w2 test using the
statistical package SPSS version 115 The level of
statistical significance was considered as p5 005
Results
The demographic characteristics and biochemical
parameters of the PCOS and control women are
demonstrated in Table I
Intentionally there was no significant difference in
age between two groups WHRs and BMIs were
significantly higher in the women with PCOS than in
the control women (Table I)
There were no statistically significant differences in
fasting glucose insulin and C-peptide levels be-
tween patients with PCOS and healthy women
(Table I) The prevalence of IFG was 55 and
68 in PCOS and healthy women respectively
(pfrac14 100) The prevalence of the IFG did not differ
significantly between the two groups None of the
subjects had the diabetes mellitus
The mean HOMA Index did not differ signifi-
cantly between PCOS and control women
294+ 125 vs 298+ 110 respectively (Values
are mean+SD pfrac14 0569)
The mean of FGIR did not differ significantly
between the PCOS and the control women
691+ 449 vs 619+ 295 respectively (Values
are mean+SD pfrac14 0213)
Prevalence of the NCEP ATP III-defined MBS
was 127 in women with PCOS (7 of 55 patients)
in comparison with 17 (1 of 59) in control women
(Table II) The prevalence of MBS was significantly
higher in the PCOS group compared to the control
group (pfrac14 0028)
Discussion
PCOS is the most frequent endocrinopathy in
childbearing females Many of these patients tend
to have high insulin levels due to IR Affected
Table I Demographic characteristics and biochemical parameters
of subjects
Parameter PCOS (nfrac1455) Controls (nfrac1459) p-value
Age(years) 2375+ 526 2449+540 0457
BMI (kgm2) 2493+ 532 2156+256 0001
Waisthip ratio 079+ 007 076+004 0007
Fasting glucose
(mgdl)
8166+ 1153 7971+915 0318
Fasting insulin
(ngdl)
058+ 022 060+021 0577
C-peptide (ngdl) 281+ 161 294+163 0611
Values are means+SD
Insulin resistance in PCOS 505
Gyn
ecol
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patients also have higher prevalence of glucose
intolerance type II DM and MBS contributing to
greater risk for cardiovascular complications in these
patients [23]
On the basis of our findings although fasting
insulin in PCOS was higher than in control group
there were no statistically significant differences in
fasting glucose and fasting insulin In the study by
Legro et al fasting glucose levels did not differ
between PCOS and control women but women with
PCOS had significantly higher fasting insulin levels
than control group [4]
Robinson et al reported that fasting glucose values
did not differ between PCOS and weight-matched
controls but the plasma glucose area that was
assessed by applying oral glucose (75 g) was greater
in the lean and obese women with PCOS than in the
controls [11]
In the study by Vrbıkova et al both lean and obese
European women with PCOS had significantly
greater levels of basal glucose and fasting insulin in
comparison with the control group [12]
In our study the prevalence of MBS was 127 in
women with PCOS and low HDL cholesterol were
the most frequent criteria of MBS (818 )
Apridonize et al [2] reported that in 106 women
with PCOS the prevalence of MBS was 43 and
low HDL cholesterol had higher frequency than
other criteria of MBS (68) [13] Park et al referred
in their article to a German study by Hahn et al that
have shown 31 of patients with PCOS had MBS
and the most common component of MBS was high
waist circumference [13] Apridonize et al in their
study demonstrated that in PCOS subjects MBS
rate was approximately two times greater than in age-
matched controls They also demonstrated that
higher rate of the MBS in women with PCOS is
independent of age and BMI [2] In our patients the
prevalence of MBS is less common but significantly
higher than in the healthy women
Some investigators have pointed out that the
greater rates of the MBS in PCOS may be linked to
the greater rates of obesity in them [14] Some
studies have obtained the same results but others
have reported that higher rates of MBS in women
with PCOS are independent of age and obesity [2]
Based on the present study HOMA did not differ
between PCOS and control women In the study by
Kurioka et al (2007) there were not significant
differences in HOMA values between Japanese
PCOS and controls Moreover HOMA values
differed significantly between obese and normal
body-weighted patients but in the normal body-
weighted subjects HOMA tests did not differ in
PCOS women and controls [15] However
DeUgarte et al study showed that the mean adjusted
HOMA (with the race age and BMI) was higher in
women with PCOS compared with control women
In their study 644 of patients with PCOS had a
HOMA value above the normal ranges [16] Despite
the fact that in our study the patients with PCOS had
higher BMIs than controls the mean of HOMA or
FGIR were similar in these two groups
In the study by Kauffman et al the means of BMI
fasting insulin and HOMA were significantly higher
in Mexican American women with PCOS in com-
parison with white women but the former group had
significantly lower mean FGIRs than the later group
Kauffman et al considered HOMA value greater
than 38 and 45 in white women and Mexican
American women respectively for detecting IR in
their patients They pointed that cut off values for
detecting of IR in the PCOS is influenced by the race
and ethnicity [17]
In the study by DeUgarte et al in patients with
PCOS HOMA has a positive correlation with BMI
but did not significantly depend on race or age
Within controls HOMA depended significantly on
age BMI and race (black patients had more IR than
whites) [16] Fulghesu et al showed the failure of the
HOMA score for exhibiting metabolic abnormalities
in young adolescent patients with PCOS They
described that a normal HOMA score is not
sufficient to exclude early metabolic abnormalities
such as hyperinsulinemia in young normal-weight
patients with PCOS On the other hand HOMA
values cannot detect the prevalence of hyperinsuli-
nemia in young normal-weight patients with PCOS
In their study 18 of patients had IR by applying
HOMA test but 44 of patients were hyperinsuli-
nemic based on the assessment by euglycemic
glucose clamp test [6] Like in the study of Fulghesu
and coworkers in our study women with PCOS
were young and the failure of present study in
detection of difference in HOMA values between
PCOS and controls may be due to the young age of
patients However Bahrami reported that the pre-
valences of IGT and type 2 DM were significantly
higher in both obese and non-obese young women
with PCOS (mean age 24+ 6 years) He recom-
mended screening of all patients with PCOS for IGT
and DM [18] In a study by Sheikholeslami et al in
Table II The prevalence for each component of metabolic
syndrome
Parameter
in PCOS
(nfrac1455)
in
Controls
(nfrac1459) p-value
Waist4 88( cm) 255 (14) 51 (3) 0002
TG150 (mgdl) 309 (17) 68 (4) 0001
HDL5 50 (mgdl) 818 (45) 797 (47) 0771
BP 13085 (mmHg) 73 (4) 0 0051
Sys BP130 (mmHg) 36 (2) 0 0231
Dia BP 85 (mmHg) 36 (2) 0 0231
Fasting Glu 100 (mgdl) 55 (3) 68(4) 100
Metabolic syn 127 (7) 17 (1) 0028
506 M Lankarani et al
Gyn
ecol
End
ocri
nol D
ownl
oade
d fr
om in
form
ahea
lthca
rec
om b
y Fr
eie
Uni
vers
itaet
Ber
lin o
n 11
05
14Fo
r pe
rson
al u
se o
nly
Iran women with PCOS (mean age 312+ 37
years) had higher basal insulin HOMA scores and
FBS in comparison with women with idiopathic
hirsutism [19]
Several studies have failed in documentation of the
link between IR and PCOS particularly in lean
subjects Cibula has explained that it may be arising
from different ethnicity andor lifestyle modifications
in women with PCOS [20]
Previous studies have exhibited that patients with
PCOS have a detrimental lipid profile including high
LDL and TG and low HDL levels [3] Insulin excess
inhibits lipolysis and leads to elevation of non-
esterified fatty acids levels that in turn contributes
to hypertriglyceridemia and decreased HDL levels
[3] In our study the prevalence of TG4 150 mgdl
was significantly higher in PCOS than in the control
group but there was no significant difference in the
occurrence of HDL5 50 between two groups
Small sample size is one of the limitations of this
study Another limitation is focusing the study on
young patients with PCOS Future studies with
larger sample size and older age group of PCOS
women seem reasonable
Conclusions
In our study HOMA and FGIR were not signifi-
cantly different in young PCOS and healthy women
but MBS was significantly more common in women
with PCOS The conflicts between different studies
in regard to IR in PCOS may be related to different
age groups ethnicity and lifestyle modifications in
various geographic regions Criteria of MBS are
frequently seen in Iranian young women with PCOS
MBS might be more useful as a prognostic factor
than IR indexes in this young age group Further
surveillance of MBS in women with PCOS will be
required We also suggest evaluation of IR by using
HOMA and FGIR tests in older age group of patients
with PCOS
Acknowledgements
This study was supported by Endocrinology and
Metabolism Research Center of Tehran University of
Medical Science in Iran
References
1 Legro RS Azziz R Ehrmann D Fereshetian AG Orsquokeefe M
Ghazzi MN Minimal response of circulating lipids in women
with polycystic ovary syndrome to improvement in insulin
sensitivity with troglitazone J Clin Endocr Metab 2003
885137ndash5144
2 Apridonidze T Essah PA Iuorno MJ Nestler JE Prevalence
and characteristics of the metabolic syndrome in women with
polycystic ovary syndrome J Clin Endocr Metab 200590
1929ndash1935
3 Leo VD Marca AL Petraglia F Insulin ndash lowering Agents in
the management of polycystic overy syndrome Endocr Rev
200324633ndash667
4 Legro RS Finegood D Dunaif A A fasting glucose to insulin
ratio is a useful measure of insulin sensitivity in women with
polycystic ovary syndrome J Clin Endocr Metab 199883
2694ndash2698
5 Flier JS Insulin resistance the metabolic syndrome X New
Engl J Med 19993411402
6 Fulghesu AM Angioni S Portoghese E Milano F Batetta B
Paoletti AM Melis GB Failures of the homeostatic model
assessment calculation score for detecting metabolic deteriora-
tion in young patients with polycystic ovary syndrome Fertil
Steril 200686398ndash404
7 Zawadzki JK Dunaif A Diagnostic criteria for polycystic
ovary syndrome towards a rational approach In Dunaif A
Givens JR Haseltine F Merriam GM editors Polycystic
ovary syndrome Boston Black well scientific 1992 pp 377ndash
384
8 Grundy SM Cleeman JI Daniels SR Donato KA Eckel RH
Franklin BA Gordon DJ Krauss RM Savage PJ Smith SC Jr
et al Diagnosis and management of the metabolic syndrome
an American Heart AssociationNational Heart Lung and
Blood Institute Scientific Statement Circulation 2005112
2735
9 Lergo RS Castracane VD Kauffman RP Detecting insulin
resistance in polycystic ovary syndrome purposes and pitfalls
Obstet Gynecol Surv 200459141ndash154
10 Genuth S Alberti KG Bennett P Follow-up report on the
diagnosis of diabetes mellitus Diabetes care 2003263160
11 Robinson S Henderson AD Gelding SV Kiddy D
Niththyananthan R Bush A Richmond W Johnston DG
Franks S Dyslipidemia is associated with insulin resistance in
women polycystic ovaries Clin Endocrinol 199644277ndash284
12 Vrbikova J Cibula D Dvorakova K Stanicka S Sindelka G
Hill M Fanta M Vondra K Skrha J Insulin Sensitivity in
women with polycystic ovary syndrome J Clin Endocr Metab
2004892942ndash2945
13 Park HR Choi Y Lee HJ Oh JY Hong YS Sung YA The
metabolic syndrome in young Korean women with polycystic
ovary syndrome Diabetes Res Clin PR 200777SS243ndashS246
Available online at wwwsciencedirectcom
14 Cussons AJ Stuckey BGA watts GF Metabolic and
cardiovascular risk in the polycystic ovary syndrome Pract
Diabetes Int 200522261ndash265
15 Kurioka H Takahashi K Miyazaki K Glucose intolerance in
japanese patients with polycystic ovary syndrome Arch
Gynecol Obstet 2007275169ndash173
16 DeUgarte CM Bartolucci AA Azziz R Prevalence of
insulin resistance in the polycystic ovary syndrome using the
homeostasis model assessment Fertil Steril 2005831454ndash
1460
17 Kauffman RP Baker VM DiMarino P Gimpel T castracane
VD Polycystic ovarian syndrome and insulin resistance in
white and Mexican American women a comparison of two
distinct populations Am J Obstet Gynecol 20021871362ndash
1369
18 Bahrami A Evaluation of impaired glucose tolerance and type
2 diabetes mellitus prevalence in PCOS and necessity for
screening in patients with PCOS Iran J Diabetes Lipid
Disord Spring Summer 20043141ndash148
19 Sheikholeslami H Mirdamadi M Ziaee A Kani C Insulin
resistance in patients with polycystic ovary syndrome In
European congress of endocrinology 2008 May 3ndash7 Berlin
Germany Bioscientifica publishers Endocrine Abstracts
(2008) 16 P648
20 Cibula D Is insulin resistance an essential component of
PCOS The influence of confounding factors Hum Reprod
200419757ndash759
Insulin resistance in PCOS 507
Gyn
ecol
End
ocri
nol D
ownl
oade
d fr
om in
form
ahea
lthca
rec
om b
y Fr
eie
Uni
vers
itaet
Ber
lin o
n 11
05
14Fo
r pe
rson
al u
se o
nly
patients also have higher prevalence of glucose
intolerance type II DM and MBS contributing to
greater risk for cardiovascular complications in these
patients [23]
On the basis of our findings although fasting
insulin in PCOS was higher than in control group
there were no statistically significant differences in
fasting glucose and fasting insulin In the study by
Legro et al fasting glucose levels did not differ
between PCOS and control women but women with
PCOS had significantly higher fasting insulin levels
than control group [4]
Robinson et al reported that fasting glucose values
did not differ between PCOS and weight-matched
controls but the plasma glucose area that was
assessed by applying oral glucose (75 g) was greater
in the lean and obese women with PCOS than in the
controls [11]
In the study by Vrbıkova et al both lean and obese
European women with PCOS had significantly
greater levels of basal glucose and fasting insulin in
comparison with the control group [12]
In our study the prevalence of MBS was 127 in
women with PCOS and low HDL cholesterol were
the most frequent criteria of MBS (818 )
Apridonize et al [2] reported that in 106 women
with PCOS the prevalence of MBS was 43 and
low HDL cholesterol had higher frequency than
other criteria of MBS (68) [13] Park et al referred
in their article to a German study by Hahn et al that
have shown 31 of patients with PCOS had MBS
and the most common component of MBS was high
waist circumference [13] Apridonize et al in their
study demonstrated that in PCOS subjects MBS
rate was approximately two times greater than in age-
matched controls They also demonstrated that
higher rate of the MBS in women with PCOS is
independent of age and BMI [2] In our patients the
prevalence of MBS is less common but significantly
higher than in the healthy women
Some investigators have pointed out that the
greater rates of the MBS in PCOS may be linked to
the greater rates of obesity in them [14] Some
studies have obtained the same results but others
have reported that higher rates of MBS in women
with PCOS are independent of age and obesity [2]
Based on the present study HOMA did not differ
between PCOS and control women In the study by
Kurioka et al (2007) there were not significant
differences in HOMA values between Japanese
PCOS and controls Moreover HOMA values
differed significantly between obese and normal
body-weighted patients but in the normal body-
weighted subjects HOMA tests did not differ in
PCOS women and controls [15] However
DeUgarte et al study showed that the mean adjusted
HOMA (with the race age and BMI) was higher in
women with PCOS compared with control women
In their study 644 of patients with PCOS had a
HOMA value above the normal ranges [16] Despite
the fact that in our study the patients with PCOS had
higher BMIs than controls the mean of HOMA or
FGIR were similar in these two groups
In the study by Kauffman et al the means of BMI
fasting insulin and HOMA were significantly higher
in Mexican American women with PCOS in com-
parison with white women but the former group had
significantly lower mean FGIRs than the later group
Kauffman et al considered HOMA value greater
than 38 and 45 in white women and Mexican
American women respectively for detecting IR in
their patients They pointed that cut off values for
detecting of IR in the PCOS is influenced by the race
and ethnicity [17]
In the study by DeUgarte et al in patients with
PCOS HOMA has a positive correlation with BMI
but did not significantly depend on race or age
Within controls HOMA depended significantly on
age BMI and race (black patients had more IR than
whites) [16] Fulghesu et al showed the failure of the
HOMA score for exhibiting metabolic abnormalities
in young adolescent patients with PCOS They
described that a normal HOMA score is not
sufficient to exclude early metabolic abnormalities
such as hyperinsulinemia in young normal-weight
patients with PCOS On the other hand HOMA
values cannot detect the prevalence of hyperinsuli-
nemia in young normal-weight patients with PCOS
In their study 18 of patients had IR by applying
HOMA test but 44 of patients were hyperinsuli-
nemic based on the assessment by euglycemic
glucose clamp test [6] Like in the study of Fulghesu
and coworkers in our study women with PCOS
were young and the failure of present study in
detection of difference in HOMA values between
PCOS and controls may be due to the young age of
patients However Bahrami reported that the pre-
valences of IGT and type 2 DM were significantly
higher in both obese and non-obese young women
with PCOS (mean age 24+ 6 years) He recom-
mended screening of all patients with PCOS for IGT
and DM [18] In a study by Sheikholeslami et al in
Table II The prevalence for each component of metabolic
syndrome
Parameter
in PCOS
(nfrac1455)
in
Controls
(nfrac1459) p-value
Waist4 88( cm) 255 (14) 51 (3) 0002
TG150 (mgdl) 309 (17) 68 (4) 0001
HDL5 50 (mgdl) 818 (45) 797 (47) 0771
BP 13085 (mmHg) 73 (4) 0 0051
Sys BP130 (mmHg) 36 (2) 0 0231
Dia BP 85 (mmHg) 36 (2) 0 0231
Fasting Glu 100 (mgdl) 55 (3) 68(4) 100
Metabolic syn 127 (7) 17 (1) 0028
506 M Lankarani et al
Gyn
ecol
End
ocri
nol D
ownl
oade
d fr
om in
form
ahea
lthca
rec
om b
y Fr
eie
Uni
vers
itaet
Ber
lin o
n 11
05
14Fo
r pe
rson
al u
se o
nly
Iran women with PCOS (mean age 312+ 37
years) had higher basal insulin HOMA scores and
FBS in comparison with women with idiopathic
hirsutism [19]
Several studies have failed in documentation of the
link between IR and PCOS particularly in lean
subjects Cibula has explained that it may be arising
from different ethnicity andor lifestyle modifications
in women with PCOS [20]
Previous studies have exhibited that patients with
PCOS have a detrimental lipid profile including high
LDL and TG and low HDL levels [3] Insulin excess
inhibits lipolysis and leads to elevation of non-
esterified fatty acids levels that in turn contributes
to hypertriglyceridemia and decreased HDL levels
[3] In our study the prevalence of TG4 150 mgdl
was significantly higher in PCOS than in the control
group but there was no significant difference in the
occurrence of HDL5 50 between two groups
Small sample size is one of the limitations of this
study Another limitation is focusing the study on
young patients with PCOS Future studies with
larger sample size and older age group of PCOS
women seem reasonable
Conclusions
In our study HOMA and FGIR were not signifi-
cantly different in young PCOS and healthy women
but MBS was significantly more common in women
with PCOS The conflicts between different studies
in regard to IR in PCOS may be related to different
age groups ethnicity and lifestyle modifications in
various geographic regions Criteria of MBS are
frequently seen in Iranian young women with PCOS
MBS might be more useful as a prognostic factor
than IR indexes in this young age group Further
surveillance of MBS in women with PCOS will be
required We also suggest evaluation of IR by using
HOMA and FGIR tests in older age group of patients
with PCOS
Acknowledgements
This study was supported by Endocrinology and
Metabolism Research Center of Tehran University of
Medical Science in Iran
References
1 Legro RS Azziz R Ehrmann D Fereshetian AG Orsquokeefe M
Ghazzi MN Minimal response of circulating lipids in women
with polycystic ovary syndrome to improvement in insulin
sensitivity with troglitazone J Clin Endocr Metab 2003
885137ndash5144
2 Apridonidze T Essah PA Iuorno MJ Nestler JE Prevalence
and characteristics of the metabolic syndrome in women with
polycystic ovary syndrome J Clin Endocr Metab 200590
1929ndash1935
3 Leo VD Marca AL Petraglia F Insulin ndash lowering Agents in
the management of polycystic overy syndrome Endocr Rev
200324633ndash667
4 Legro RS Finegood D Dunaif A A fasting glucose to insulin
ratio is a useful measure of insulin sensitivity in women with
polycystic ovary syndrome J Clin Endocr Metab 199883
2694ndash2698
5 Flier JS Insulin resistance the metabolic syndrome X New
Engl J Med 19993411402
6 Fulghesu AM Angioni S Portoghese E Milano F Batetta B
Paoletti AM Melis GB Failures of the homeostatic model
assessment calculation score for detecting metabolic deteriora-
tion in young patients with polycystic ovary syndrome Fertil
Steril 200686398ndash404
7 Zawadzki JK Dunaif A Diagnostic criteria for polycystic
ovary syndrome towards a rational approach In Dunaif A
Givens JR Haseltine F Merriam GM editors Polycystic
ovary syndrome Boston Black well scientific 1992 pp 377ndash
384
8 Grundy SM Cleeman JI Daniels SR Donato KA Eckel RH
Franklin BA Gordon DJ Krauss RM Savage PJ Smith SC Jr
et al Diagnosis and management of the metabolic syndrome
an American Heart AssociationNational Heart Lung and
Blood Institute Scientific Statement Circulation 2005112
2735
9 Lergo RS Castracane VD Kauffman RP Detecting insulin
resistance in polycystic ovary syndrome purposes and pitfalls
Obstet Gynecol Surv 200459141ndash154
10 Genuth S Alberti KG Bennett P Follow-up report on the
diagnosis of diabetes mellitus Diabetes care 2003263160
11 Robinson S Henderson AD Gelding SV Kiddy D
Niththyananthan R Bush A Richmond W Johnston DG
Franks S Dyslipidemia is associated with insulin resistance in
women polycystic ovaries Clin Endocrinol 199644277ndash284
12 Vrbikova J Cibula D Dvorakova K Stanicka S Sindelka G
Hill M Fanta M Vondra K Skrha J Insulin Sensitivity in
women with polycystic ovary syndrome J Clin Endocr Metab
2004892942ndash2945
13 Park HR Choi Y Lee HJ Oh JY Hong YS Sung YA The
metabolic syndrome in young Korean women with polycystic
ovary syndrome Diabetes Res Clin PR 200777SS243ndashS246
Available online at wwwsciencedirectcom
14 Cussons AJ Stuckey BGA watts GF Metabolic and
cardiovascular risk in the polycystic ovary syndrome Pract
Diabetes Int 200522261ndash265
15 Kurioka H Takahashi K Miyazaki K Glucose intolerance in
japanese patients with polycystic ovary syndrome Arch
Gynecol Obstet 2007275169ndash173
16 DeUgarte CM Bartolucci AA Azziz R Prevalence of
insulin resistance in the polycystic ovary syndrome using the
homeostasis model assessment Fertil Steril 2005831454ndash
1460
17 Kauffman RP Baker VM DiMarino P Gimpel T castracane
VD Polycystic ovarian syndrome and insulin resistance in
white and Mexican American women a comparison of two
distinct populations Am J Obstet Gynecol 20021871362ndash
1369
18 Bahrami A Evaluation of impaired glucose tolerance and type
2 diabetes mellitus prevalence in PCOS and necessity for
screening in patients with PCOS Iran J Diabetes Lipid
Disord Spring Summer 20043141ndash148
19 Sheikholeslami H Mirdamadi M Ziaee A Kani C Insulin
resistance in patients with polycystic ovary syndrome In
European congress of endocrinology 2008 May 3ndash7 Berlin
Germany Bioscientifica publishers Endocrine Abstracts
(2008) 16 P648
20 Cibula D Is insulin resistance an essential component of
PCOS The influence of confounding factors Hum Reprod
200419757ndash759
Insulin resistance in PCOS 507
Gyn
ecol
End
ocri
nol D
ownl
oade
d fr
om in
form
ahea
lthca
rec
om b
y Fr
eie
Uni
vers
itaet
Ber
lin o
n 11
05
14Fo
r pe
rson
al u
se o
nly
Iran women with PCOS (mean age 312+ 37
years) had higher basal insulin HOMA scores and
FBS in comparison with women with idiopathic
hirsutism [19]
Several studies have failed in documentation of the
link between IR and PCOS particularly in lean
subjects Cibula has explained that it may be arising
from different ethnicity andor lifestyle modifications
in women with PCOS [20]
Previous studies have exhibited that patients with
PCOS have a detrimental lipid profile including high
LDL and TG and low HDL levels [3] Insulin excess
inhibits lipolysis and leads to elevation of non-
esterified fatty acids levels that in turn contributes
to hypertriglyceridemia and decreased HDL levels
[3] In our study the prevalence of TG4 150 mgdl
was significantly higher in PCOS than in the control
group but there was no significant difference in the
occurrence of HDL5 50 between two groups
Small sample size is one of the limitations of this
study Another limitation is focusing the study on
young patients with PCOS Future studies with
larger sample size and older age group of PCOS
women seem reasonable
Conclusions
In our study HOMA and FGIR were not signifi-
cantly different in young PCOS and healthy women
but MBS was significantly more common in women
with PCOS The conflicts between different studies
in regard to IR in PCOS may be related to different
age groups ethnicity and lifestyle modifications in
various geographic regions Criteria of MBS are
frequently seen in Iranian young women with PCOS
MBS might be more useful as a prognostic factor
than IR indexes in this young age group Further
surveillance of MBS in women with PCOS will be
required We also suggest evaluation of IR by using
HOMA and FGIR tests in older age group of patients
with PCOS
Acknowledgements
This study was supported by Endocrinology and
Metabolism Research Center of Tehran University of
Medical Science in Iran
References
1 Legro RS Azziz R Ehrmann D Fereshetian AG Orsquokeefe M
Ghazzi MN Minimal response of circulating lipids in women
with polycystic ovary syndrome to improvement in insulin
sensitivity with troglitazone J Clin Endocr Metab 2003
885137ndash5144
2 Apridonidze T Essah PA Iuorno MJ Nestler JE Prevalence
and characteristics of the metabolic syndrome in women with
polycystic ovary syndrome J Clin Endocr Metab 200590
1929ndash1935
3 Leo VD Marca AL Petraglia F Insulin ndash lowering Agents in
the management of polycystic overy syndrome Endocr Rev
200324633ndash667
4 Legro RS Finegood D Dunaif A A fasting glucose to insulin
ratio is a useful measure of insulin sensitivity in women with
polycystic ovary syndrome J Clin Endocr Metab 199883
2694ndash2698
5 Flier JS Insulin resistance the metabolic syndrome X New
Engl J Med 19993411402
6 Fulghesu AM Angioni S Portoghese E Milano F Batetta B
Paoletti AM Melis GB Failures of the homeostatic model
assessment calculation score for detecting metabolic deteriora-
tion in young patients with polycystic ovary syndrome Fertil
Steril 200686398ndash404
7 Zawadzki JK Dunaif A Diagnostic criteria for polycystic
ovary syndrome towards a rational approach In Dunaif A
Givens JR Haseltine F Merriam GM editors Polycystic
ovary syndrome Boston Black well scientific 1992 pp 377ndash
384
8 Grundy SM Cleeman JI Daniels SR Donato KA Eckel RH
Franklin BA Gordon DJ Krauss RM Savage PJ Smith SC Jr
et al Diagnosis and management of the metabolic syndrome
an American Heart AssociationNational Heart Lung and
Blood Institute Scientific Statement Circulation 2005112
2735
9 Lergo RS Castracane VD Kauffman RP Detecting insulin
resistance in polycystic ovary syndrome purposes and pitfalls
Obstet Gynecol Surv 200459141ndash154
10 Genuth S Alberti KG Bennett P Follow-up report on the
diagnosis of diabetes mellitus Diabetes care 2003263160
11 Robinson S Henderson AD Gelding SV Kiddy D
Niththyananthan R Bush A Richmond W Johnston DG
Franks S Dyslipidemia is associated with insulin resistance in
women polycystic ovaries Clin Endocrinol 199644277ndash284
12 Vrbikova J Cibula D Dvorakova K Stanicka S Sindelka G
Hill M Fanta M Vondra K Skrha J Insulin Sensitivity in
women with polycystic ovary syndrome J Clin Endocr Metab
2004892942ndash2945
13 Park HR Choi Y Lee HJ Oh JY Hong YS Sung YA The
metabolic syndrome in young Korean women with polycystic
ovary syndrome Diabetes Res Clin PR 200777SS243ndashS246
Available online at wwwsciencedirectcom
14 Cussons AJ Stuckey BGA watts GF Metabolic and
cardiovascular risk in the polycystic ovary syndrome Pract
Diabetes Int 200522261ndash265
15 Kurioka H Takahashi K Miyazaki K Glucose intolerance in
japanese patients with polycystic ovary syndrome Arch
Gynecol Obstet 2007275169ndash173
16 DeUgarte CM Bartolucci AA Azziz R Prevalence of
insulin resistance in the polycystic ovary syndrome using the
homeostasis model assessment Fertil Steril 2005831454ndash
1460
17 Kauffman RP Baker VM DiMarino P Gimpel T castracane
VD Polycystic ovarian syndrome and insulin resistance in
white and Mexican American women a comparison of two
distinct populations Am J Obstet Gynecol 20021871362ndash
1369
18 Bahrami A Evaluation of impaired glucose tolerance and type
2 diabetes mellitus prevalence in PCOS and necessity for
screening in patients with PCOS Iran J Diabetes Lipid
Disord Spring Summer 20043141ndash148
19 Sheikholeslami H Mirdamadi M Ziaee A Kani C Insulin
resistance in patients with polycystic ovary syndrome In
European congress of endocrinology 2008 May 3ndash7 Berlin
Germany Bioscientifica publishers Endocrine Abstracts
(2008) 16 P648
20 Cibula D Is insulin resistance an essential component of
PCOS The influence of confounding factors Hum Reprod
200419757ndash759
Insulin resistance in PCOS 507
Gyn
ecol
End
ocri
nol D
ownl
oade
d fr
om in
form
ahea
lthca
rec
om b
y Fr
eie
Uni
vers
itaet
Ber
lin o
n 11
05
14Fo
r pe
rson
al u
se o
nly