Adjusted and unadjusted hazard ratios of pregnancy
| Contraceptive method | Crude pregnancy incidence (95% CI) | Unadjusted HR (95% CI) | p | Adjusted HR (95% CI) | p |
|---|---|---|---|---|---|
| Injectable | 4.4 (3.3–5.9) | 0.38 (0.23–0.64) | <0.001 | 0.27 (0.16–0.47) | <0.001 |
| Pills | 19.3 (13.3–28.0) | 1.67 (0.95–2.95) | 0.075 | 1.29 (0.72–2.31) | 0.394 |
| Condoms | 19.7 (16.3–23.6) | 1.70 (1.07–2.72) | 0.024 | 1.40 (0.85–2.32) | 0.179 |
| Other | 11.5 (7.5–17.6) | 1.00 | 1.00 |
The overall crude pregnancy incidence was 10.8 per 100 woman-years (95% CI 9.4–12.4).
Adjusted for age, religion, number of sexual acts in the past week and condom use at last sexual act.
95% CI, 95% confidence interval; HR, hazard ratio.