“…However, this study may not have had sufficient power to prove or disprove the hypothesis. 2 In another study, Kovacs et al 3 evaluated the use of the POP as a precoital contraceptive in 16 women whose husbands were known to be azoospermic. These women were randomised to receive one tablet of a POP, containing either levonorgestrel or norethisterone, 2-3 days prior to estimated ovulation.…”