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Time related pregnancy rates Normally fertile Moderately subfertile Severely subfertile 6 mths 74% 26% 6% 12 mths 93% 46% 11% 24 mths 100% 71% 21% Evers & te Velde 2002 Infertility: estimating prevalence Numerator Denominator • Entire eligible population • Only those who wish to have a child • Only those not using contraception • Time to pregnancy = 12/24 months • Time spent trying = 12/24 months •Time of exposure = 12/24 months • and / or medical contact 6 PRECONGRESS COURSE 09 I VIENNA, AUSTRIA – 23 JUNE 2019 09
