J. Med. Internet Res. - Nonprobability Web surveys to measure sexual behaviors and attitudes in the general population: a comparison with a probability sample interview survey.

Tópicos

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Resumo

CKGROUND: Nonprobability Web surveys using volunteer panels can provide a relatively cheap and quick alternative to traditional health and epidemiological surveys. However, concerns have been raised about their representativeness.OBJECTIVE: The aim was to compare results from different Web panels with a population-based probability sample survey (n=8969 aged 18-44 years) that used computer-assisted self-interview (CASI) for sensitive behaviors, the third British National Survey of Sexual Attitudes and Lifestyles (Natsal-3).METHODS: Natsal-3 questions were included on 4 nonprobability Web panel surveys (n=2000 to 2099), 2 using basic quotas based on age and sex, and 2 using modified quotas based on additional variables related to key estimates. Results for sociodemographic characteristics were compared with external benchmarks and for sexual behaviors and opinions with Natsal-3. Odds ratios (ORs) were used to express differences between the benchmark data and each survey for each variable of interest. A summary measure of survey performance was the average absolute OR across variables. Another summary measure was the number of key estimates for which the survey differed significantly (at the 5% level) from the benchmarks.RESULTS: For sociodemographic variables, the Web surveys were less representative of the general population than Natsal-3. For example, for men, the average absolute OR for Natsal-3 was 1.14, whereas for the Web surveys the average absolute ORs ranged from 1.86 to 2.30. For all Web surveys, approximately two-thirds of the key estimates of sexual behaviors were different from Natsal-3 and the average absolute ORs ranged from 1.32 to 1.98. Differences were appreciable even for questions asked by CASI in Natsal-3. No single Web survey performed consistently better than any other did. Modified quotas slightly improved results for men, but not for women.CONCLUSIONS: Consistent with studies from other countries on less sensitive topics, volunteer Web panels provided appreciably biased estimates. The differences seen with Natsal-3 CASI questions, where mode effects may be similar, suggest a selection bias in the Web surveys. The use of more complex quotas may lead to some improvement, but many estimates are still likely to differ. Volunteer Web panels are not recommended if accurate prevalence estimates for the general population are a key objective.

Resumo Limpo

ckground nonprob web survey use volunt panel can provid relat cheap quick altern tradit health epidemiolog survey howev concern rais representativenessobject aim compar result differ web panel populationbas probabl sampl survey n age year use computerassist selfinterview casi sensit behavior third british nation survey sexual attitud lifestyl natsalmethod natsal question includ nonprob web panel survey n use basic quota base age sex use modifi quota base addit variabl relat key estim result sociodemograph characterist compar extern benchmark sexual behavior opinion natsal odd ratio or use express differ benchmark data survey variabl interest summari measur survey perform averag absolut across variabl anoth summari measur number key estim survey differ signific level benchmarksresult sociodemograph variabl web survey less repres general popul natsal exampl men averag absolut natsal wherea web survey averag absolut or rang web survey approxim twothird key estim sexual behavior differ natsal averag absolut or rang differ appreci even question ask casi natsal singl web survey perform consist better modifi quota slight improv result men womenconclus consist studi countri less sensit topic volunt web panel provid appreci bias estim differ seen natsal casi question mode effect may similar suggest select bias web survey use complex quota may lead improv mani estim still like differ volunt web panel recommend accur preval estim general popul key object

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