general population survey methodology janusz sieroslawski institute of psychiatry and neurology...

GENERAL POPULATION SURVEY GENERAL POPULATION SURVEY METHODOLOGY METHODOLOGY

Janusz SieroslawskiInstitute of Psychiatry and Neurology

Warsaw

General population survey (GPS) on prevalence and consumption of drugs, opinion, knowledge about drugs and risk

Belgrad, 25th of February – 1st of March 2013

Janusz Sierosławski

Population surveys in PolandPopulation surveys in Poland

Quite long tradition of the countrywide general population surveys focused on alcohol consumption (1962, 1968, 1976, 1984, 1989, 1993, 1995, 1998, 2002, 2006, 2010)Questions on drug use in 1984 and 1989 included – only a few cases of illicit drug use foundIn 1997 first general population survey on drug use covering Warsaw onlySince 2002 country wide population surveys each 4 years (2006, 2010)


Aims and objectives of the studiesAims and objectives of the studies

Monitoring of drug use and alcohol consumption and exploring of attitudes toward drug and alcohol problem as a aim of the study

Objectives of the study related to the drugsto assess prevalence of occasional drug use in general population

to identify factors of occasional drug use

to explore attitudes toward drug addiction and various approaches to drug policy


Study designStudy design

Studies commissioned by National Bureau for Drug Prevention

Field work conducted by contracted agency

Target population – Poland’s inhabitants age 15-64

Respondents selection: random sample

Data collection technique – face-to-face interview (pen and paper)

Data processing using SPSS PC


QuestionnaireQuestionnaire -1 -1

Questionaire developed on the basis of EMQ

Questions with predefined answers

Drugs, alcohol, tobacco, prescribed drugs under study

Particular drugs use explored in life-time, last 12 months and last 30 days time frame (number of times, age of onset)


Questionnaire -Questionnaire -22

Indicators of drugs availability (perceived availability, exposer to drug offers)

Alcohol consumption measurement in 12 months time frame

Beverage Specific Quantity Frequency method

Screening instruments (AUDIT)

Nominations for „benchmark” estimation

Opinions on drug problem and different approaches to the problem


PopulationPopulation

Territorial (geographical) coverageCountrywide

Overrepresentations of some regions

Age coverage15-64

Overrepresentations of 15-34

Inhabitants of Poland regardless nationalityStay as a criterion instead of registration

People living in institutions (prison, shelter, military barracks) excluded


SamplingSampling

Sampling method – multistage stratified random sample with overrepresentations of some subpopulations

First stage – small geographical areas

Second stage – households

Third stage - respondents

Sampling frame – electronic data base of haushold addresses

Sampling output – houshold addresses

Weighting procedure to reduce bias (gender, age and education level)


WeightingWeighting

Weighting procedure to reduce bias related to:

overrepresentations

nonresponses gender

age groups

rural – urban areas

Weighting lead to sample size reduction


Data Data collectioncollection – field work procedure – field work procedure

Pilot study – to test questionnaire and fieldwork proceduresSpecial training procedure for interviewers:

practical exercise interviewinginstruction for interviewers in the written formprobation interview to test interviewers’ skills

Field control of the interviewers’ jobThe letter explaining study and announcing interviewers’ visit sent before field work phaseInterview duration: 45-60 minutes


Interviewer biasInterviewer bias

Substance use very sensitive issue

Interviewer could influence respondents answers by manifesting own attitudes

Interviewer have to establish confidence and provide a sense of security

Selection of interviewers

Interviewers training focus on:how to establish confidence and provide a sense of security

how to avoid manifestation of own attitudes


Ethical issueEthical issuess

Anonymity of respondents as the crucial factor of the data reliabilityData protection mechanisms applied:

interviewers obliged to keep secret of information collected and to protect datarespondents’ names always separated from the fulfilled questionnairesface-to-face interview always without presence of other persons data base without names

Agreement of respondent for giving interview requested

general population survey methodology janusz sieroslawski institute of psychiatry and neurology...

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