Selection Bias in Occupational Sperm Studies
Open Access
- 1 April 1998
- journal article
- research article
- Published by Oxford University Press (OUP) in American Journal of Epidemiology
- Vol. 147 (7) , 681-685
- https://doi.org/10.1093/oxfordjournals.aje.a009509
Abstract
Participation rates in sperm studies are typically 25–50%, and therefore it is a matter of concern whether the men who provide semen samples truly reflect the parent population. The authors analyzed data from three Danish occupational sperm studies and evaluated the relation between age and occurrence of subfertility to participation and provision of semen samples. Age and subfertility were found to be rather strong determinants of participation. Willingness to provide semen samples was greater among men aged Am J Epidemiol 1998; 147: 681–5.Keywords
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