Downloading the PowerPoint slide may take up to 30 seconds. If the slide opens in your browser, select File -> Save As to save it.
Copyright restrictions may apply. Please see our Conditions of Use.
 Article Links
 •Return to Article



Figure 1. Observed (open circle) and expected (closed circle) numbers of pregnancies by timing of coitus in relation to predicted ovulation, by treatment group. Reprinted with permission from Lancet (1998;352:428-433). Copyright 1998, the Lancet Publishing Group, London, England, a division of Elsevier Science Ltd.