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Description:Although survey non-response does not necessarily imply non-response bias, 45 it is useful to identify any major imbalances in key demographics across our data and the sampling frame. Indeed, upwards of 90 per cent of individuals who make initial contact with a sperm bank in the U. Cohen and Coan make a similar argument when using a convenience sample of males in the USA, most of which have never donated sperm in the past. Donors are protected from any kind of parental responsibility by state and federal law. More specifically, we were able to obtain aggregate information on the age, race percent white , religion percent Christian , and marital status at the time of donation percent married for individuals contacted as part of our study. In particular, one might worry about preexisting secular time trends in donor participation in the countries that adopted donor identification laws and also the possibility of reverse causation in that adoption of these laws may be driven by these trends in donation and not vice versa.
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