Typical use life-table pregnancy rates by the study they participated in before continuing to the longer-term follow-up study
| From efficacy study | From method introduction studies | |||
|---|---|---|---|---|
| (n=478) | (n=1181) | |||
| Period | Pregnancy rate (%) | 95% CI | Pregnancy rate (%) | 95% CI |
| Year 1* | 12.0 | 8.5–15.3 | 14.1 | 11.8–16.4 |
| Year 2 | 5.2 | 1.8–8.5 | 3.7 | 1.9–5.6 |
| Year 3 | 3.4 | 0.4–6.3 | 5.9 | 3.0–8.8 |
* Year 1 rates from the efficacy study were calculated per 13 cycles; all other rates were calculated using calendar quarters.
CI, confidence interval.