Average failure rate of various contraceptive techniques (Sherwood, 2012, p. 780).
Contraceptive Method | Average Failure Rate (Annual Pregnancies/ 100 Women) | |
---|---|---|
1 | None | 90 |
2 | Natural (rhythm) methods | 20–30 |
3 | Coitus interruptus | 23 |
4 | Chemical contraceptives | 20 |
5 | Barrier methods | 10–20 |
6 | Intrauterine device | 4 |
7 | Oral contraceptives | 2–2.5 |
8 | Implanted contraceptives | 1 |