title: Men who have sex with men in Great Britain: comparison of a self-selected internet sample with a national probability sample.
abstract: OBJECTIVE
  To compare the characteristics of a self-selected, convenience sample of men who have sex with men (MSM) recruited through the internet with MSM drawn from a national probability survey in Great Britain.
  
  
  METHODS
  The internet sample (n = 2065) was recruited through two popular websites for homosexual men in Great Britain in May and June 2003. This sample was compared with MSM (n = 117) from the National Survey of Sexual Attitudes and Lifestyles (Natsal), a probability sample survey of adults resident in Great Britain conducted between May 1999 and February 2001.
  
  
  RESULTS
  No significant differences were observed between the samples on a range of sociodemographic and behavioural variables (p>0.05). However, men from the internet sample were younger (p<0.001) and more likely to be students (p = 0.001), but less likely to live in London (p = 0.001) or report good health (p = 0.014). Although both samples were equally likely to report testing for HIV, men from the internet sample were more likely to report a sexually transmitted infection in the past year (16.9% v 4.8%, adjusted odds ratio 4.14, 95% CI 1.76 to 9.74; p = 0.001), anal intercourse (76.9% v 63.3%; p = 0.001) and unprotected anal intercourse in the past 3 months (45% v 36.6%; p = 0.064).
  
  
  CONCLUSIONS
  The internet provides a means of recruiting a self-selected, convenience sample of MSM whose social and demographic characteristics are broadly similar to those of MSM drawn from a national probability survey. However, estimates of high-risk sexual behaviour based on internet convenience samples are likely to overestimate levels of sexual risk behaviour in the wider MSM population.
authors.affiliation: City University, School of Social Sciences and Institute of Health Sciences, London, UK. alison.evans.1@city.ac.uk
authors.forename: Alison Ruth
authors.initials: AR
authors.lastname: Evans
authors.forename: Richard D
authors.initials: RD
authors.lastname: Wiggins
authors.forename: Catherine H
authors.initials: CH
authors.lastname: Mercer
authors.forename: Graham J
authors.initials: GJ
authors.lastname: Bolding
authors.forename: Jonathan
authors.initials: J
authors.lastname: Elford
mesh_terms: D000293:Adolescent; D000328:Adult; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D020407:Internet; D008297:Male; D012494:Sampling Studies; D012747:Sexual Partners; D011795:Surveys and Questionnaires; D006113:United Kingdom / Q000453:epidemiology