Table 3.
Total Unintended Pregnancy Rates per 100 Women Over Twelve Months of Use according to the Kaplan–Meier Approach for the Different Reproductive Groups.
| User Characteristics | Regular Cycles (n = 402) | Postpartum/Breastfeeding (n = 741) | Irregular Cycles (n = 68) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Women Exposed | Pregnancies | Rate | SE | Women Exposed | Pregnancies | Rate | SE | Women Exposed | Pregnancies | Rate | SE | |
| Three months | 286 | 3 | 0.9 | .01 | 609 | 5 | 0.8 | .00 | 51 | 0 | 0 | 0 |
| Six months | 172 | 2 | 2.0 | .01 | 578 | 3 | 1.3 | .00 | 35 | 0 | 0 | 0 |
| Nine months | 125 | 1 | 2.8 | .01 | 403 | 3 | 2.0 | .01 | 27 | 0 | 0 | 0 |
| Twelve months | 113 | 0 | 2.8 | 0 | 373 | 23 | 7.9 | .01 | 22 | 1 | 4.3 | .04 |
| Total | 6 | 34 | 1 | |||||||||
Note: N = 1,221; n = 1,211 due to missing data. SE = standard error.