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 |