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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)
Janusz Sierosławski
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
Janusz Sierosławski
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
Janusz Sierosławski
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)
Janusz Sierosławski
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
Janusz Sierosławski
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
Janusz Sierosławski
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)
Janusz Sierosławski
WeightingWeighting
Weighting procedure to reduce bias related to:
overrepresentations
nonresponses gender
age groups
rural – urban areas
Weighting lead to sample size reduction
Janusz Sierosławski
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
Janusz Sierosławski
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
Janusz Sierosławski
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
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