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Table 5 Pearl Index at different follow-up periods

From: Efficacy of a combined contraceptive regimen consisting of condoms and emergency contraception pills

Month Intervention group Control group Total
Person-month No. of preg. Pearl Index Person-month No. of preg. Pearl Index Person-month No. of preg. Pearl Index
0 ~ 2 2383.2 7 3.52 2479.7 2 0.97 4862.9 9 2.22
3 ~ 5 2307.6 4 2.08 2060.8 3 1.75 4368.4 7 1.92
6 ~ 8 2275.2 2 1.05 2036.9 2 1.18 4312.1 4 1.11
9 ~ 11 2256.8 4 2.13 2019.5 2 1.19 4276.3 6 1.12
0 ~ 11 9222.8 17 2.21 8596.9 9 1.26 17819.7 26 1.75
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