The impact of non-response bias due to sampling in public health studies:A comparison of voluntary versus mandatory recruitment in a Dutch national survey on adolescent health

Background: In public health monitoring of young people it is critical to understand the effects of selective nonresponse, in particular when a controversial topic is involved like substance abuse or sexual behaviour. Research that is dependent upon voluntary subject participation is particularly vulnerable to sampling bias. As respondents whose participation is hardest to elicit on a voluntary basis are also more likely to report risk behaviour, this potentially leads to underestimation of risk factor prevalence. Inviting adolescents to participate in a home-sent postal survey is a typical vo... Mehr ...