Table 4 Relative risk of contraceptive failure according to survey year and type of pre-pregnancy contraceptive method
Contraceptive failure | ||||||
|---|---|---|---|---|---|---|
Crude RR | 95% CI | Model A | Model B | |||
aRRa | 95% CI | aRRb | 95% CI | |||
Year | ||||||
2010 | 1 | Ref | 1 | Ref | 1 | Ref |
2016 | 1.28 | 1.17–1.39 | 1.34 | 1.23–1.47 | 1.35 | 1.25–1.49 |
Last contraceptive method used | ||||||
Pill | – | – | – | – | 1 | Ref |
IUD/patch/implant/vaginal ring | – | – | – | – | 0.45 | 0.37–0.54 |
Male condom | – | – | – | – | 1.61 | 1.42–1.83 |
Withdrawal, periodic abstinence or other method | _ | _ | _ | _ | 2.56 | 2.14–3.07 |