Table 4.
Survival Rates per One Hundred Women Pregnant by Typical and Correct Months of Use (N = 216).
| Months | Typical | Correct | ||||||
|---|---|---|---|---|---|---|---|---|
| (1,660 months of use) | (1,558 months of use) | |||||||
| SR | SE | Preg. | N | SR | SE | Preg. | n | |
| 1 | 1.00 | .000 | 0 | 216 | 1.00 | .000 | 0 | 215 |
| 3 | 1.00 | .000 | 0 | 169 | 1.00 | .000 | 0 | 168 |
| 6 | .993 | .007 | 1 | 152 | .993 | .007 | 1 | 152 |
| 9 | .975 | .014 | 2 | 101 | .985 | .011 | 1 | 115 |
| 12 | .965 | .018 | 1 | 77 | .985 | .011 | 0 | 76 |
Note: SR = survival rate per one hundred women per twelve months of use, SE = standard error, Preg. = number of pregnancies per three cycles of use, and N = total number of women exposed.