Table 4.
Total Unintended Pregnancy Rates Per 100 Women Over Twelve Months of Use according to the Kaplan–Meier Approach for Fertility Monitoring Types.
| User Characteristics | CMM Only (n = 114) | EHFM Only (n = 332) | CMM + EHFM (n = 283) | LH Plusa (n = 471) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Women Exposed | Pregnancies | Rate | SE | Women Exposed | Pregnancies | Rate | SE | Women Exposed | Pregnancies | Rate | SE | Women Exposed | Pregnancies | Rate | SE | |
| Three months | 92 | 0 | 0 | 0 | 253 | 2 | 0.7 | .01 | 168 | 3 | 1.2 | .01 | 423 | 3 | 0.7 | .0 |
| Six months | 16 | 0 | 0 | 0 | 231 | 1 | 1.1 | .01 | 123 | 4 | 4.4 | .02 | 406 | 0 | 0 | .0 |
| Nine months | 12 | 1 | 7.1 | .07 | 126 | 1 | 1.8 | .01 | 85 | 1 | 5.5 | .02 | 325 | 2 | 1.3 | .01 |
| Twelve months | 10 | 1 | 15.6 | .10 | 109 | 7 | 8.1 | .03 | 76 | 7 | 14.1 | .04 | 306 | 9 | 4.1 | .01 |
| Total | 2 | 11 | 15 | 14 | ||||||||||||
Note: N = 1,221; n = 1,200 due to missing data. CMM = cervical mucus monitoring; EHFM = electronic hormonal fertility monitor; LH = luteinizing hormone; SE = standard error.
a Includes use of LH as a second check for Peak fertility with either CMM or EHFM.