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 |