Table 2.
Adjusted hazard ratios of multivariable risk score models on contraceptive discontinuation in the derivation cohort.
| Full risk score |
Simplified risk score |
|||
|---|---|---|---|---|
| HR (95% CI) | Points | HR (95% CI) | Points | |
| Contraceptive method type | ||||
| Cu-IUD/IUS | 1.58 (0.67–3.72) | 1 | 1.56 (0.66–3.66) | 1 |
| Pillsa | 3.16 (1.59–6.26) | 3 | 3.32 (1.68–6.57) | 3 |
| Other modernb | 5.32 (2.46–11.42) | 4 | 4.95 (2.32–10.59) | 4 |
| Reference: injectables, implants | Ref. | 0 | Ref. | 0 |
| FP user type | ||||
| Continuing method used in past month | 2.25 (1.14–4.23) | 2 | 2.41 (1.23–4.73) | 2 |
| Switching from one method type to another | 2.10 (0.88–5.06) | 2 | 2.07 (0.87–4.97) | 2 |
| Reference: initiating contraception | Ref. | 0 | Ref. | 0 |
| < 9 years of completed education | 1.62 (1.01–2.60) | 1 | -- | -- |
| Does not have child aged < 6 months | 1.60 (0.89–2.86) | 1 | 1.57 (0.88–2.82) | 1 |
| Relationship status | ||||
| Spouse supportive of FP | 4.58 (0.63–33.24) | 3 | -- | -- |
| Not married (legal or presumed) | 7.34 (0.97–55.21) | 4 | 1.70 (0.98–2.93) | 1 |
| Reference: spouse unsupportive/unsure of spousal support | Ref. | 0 | -- | -- |
| Maximum score | 12 | 8 | ||
Notes: Variables included in the full risk score model were selected using stepwise forwards and backwards selection to identify the Cox model with the minimum AIC value. The Efron approach was used to handle ties. The simplified risk score was developed by removing features in the full risk score that are not routinely collected (either verbally or in written documentation) in Kenyan public health facilities. β is the Cox proportional hazards model coefficients (nonexpontentiated).
Pills include daily combined and progestin-only oral contraceptives.
Other modern methods include condoms, fertility-awareness-based methods (LAM, TwoDay Method, Standard Days Method) and emergency contraceptive pills.