The effectiveness of IVF over expectant management has been proven only for bilateral tubal occlusion. We aimed to estimate the chance of pregnancy without treatment for IVF patients, using data on the waiting period before the start of IVF.
Department of Public Health, Erasmus MC, University Medical Center, Dr Molewaterplein 40, PO Box 1738, 3000 DR Rotterdam, The Netherlands. m.eijkemans@erasmusmc.nl