Baseline characteristics of randomised and surveyed samples
| Randomised sample [sample 1] | Short-term sample [sample 2]* | Medium-term sample [sample 3]† | Difference: (p values) | ||
| % / mean (n) | % / mean (n) | % / mean (n) | [sample 2] versus [sample 1] | [sample 3] versus [sample 1] | |
| Female age (years)‡ | 24.70 (612) | 24.68 (484) | 24.68 (384) | (0.940) | (0.943) |
| Female secondary education or higher‡ | 0.83 (435/524) | 0.83 (356/427) | 0.84 (297/353) | (0.884) | (0.660) |
| Multiparous‡ | 0.63 (398/632) | 0.62 (307/497) | 0.63 (245/391) | (0.679) | (0.920) |
| Previous use of modern contraception | 0.67 (461/684) | 0.67 (361/536) | 0.66 (275/418) | (0.986) | (0.584) |
| Female preference for no future children | 0.30 (203/683) | 0.29 (157/535) | 0.30 (126/417) | (0.887) | (0.863) |
| Male partner preference for no future children | 0.21 (131/635) | 0.21 (106/502) | 0.21 (84/393) | (0.842) | (0.777) |
| Antenatal intention to use short-term postpartum contraception | 0.32 (215/682) | 0.30 (162/534) | 0.31 (130/416) | (0.657) | (0.924) |
| Days between study enrolment and estimated date of delivery | 41.53 (683) | 41.05 (536) | 39.32 (418) | (0.735) | (0.138) |
| Travel time to Jacaranda Health facility (in min) | 30.41 (677) | 30.31 (531) | 31.08 (415) | (0.936) | (0.618) |
| Remained in sample | – | 0.78 (537/686) | 0.61 (418/686) | – | – |
Modern contraception includes the following methods: sterilisation (female or male), intrauterine devices and systems, implants, oral contraceptive pills (combined and progestin-only), emergency contraceptive pills, condoms (male/female), injectables, patches, diaphragms/cervical caps, spermicides, vaginal ring and vaginal sponge. P values generated using ordinary least squares estimation. All models include a binary variable indicating enrolment facility and a binary variable indicating study phase (1 or 2). Antenatal intention to use short-term postpartum contraception is defined as a stated baseline intention to use contraception by 9 weeks postpartum. P values generated using t-tests assuming unequal variance.
*Sample of participants with complete data on short-term postpartum modern family planning use.
†Sample of participants with complete data on medium-term postpartum modern family planning use.
‡Data source is Jacaranda's electronic medical records; all other indicators collected via baseline antenatal survey.