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. 2017 Jan;95(1):50–54. doi: 10.1016/j.contraception.2016.08.001

Table 4a.

Analyses of combined of three WHO HRP studies looking at number of pregnancies, pregnancy rates (excluding data from Nigeria)

Variables (excluding data from Nigeria) Number of pregnancies Number of women Pregnancy rate (%) Odds ratio (95% CI)
BMI (<25) kg/m2 62 3668 1.69 Eliminated
[25–30) kg/m2 2 341 0.59 Eliminated
[30 ++) kg/m2 0 65 0.00

Note.

Other factors that were shown to significantly affect pregnancy rates include delay in treatment more than 48 h, further acts of pregnancy and timing of drug intake in relation to time of ovulation (at day 0 and later).