| Characteristics | | Unadjusted | Adjusted | Pregnant/total (%) | PRR (95% CI) | PRR (95% CI) |
| Overall | 109/1514 (7.2) | | | Age (years) | | | | 15–24 | 31/199 (15.6) | 1.0 | 1.0 | 25–34 | 61/830 (7.4) | 0.47 (0.30, 0.74) | 0.55 (0.34, 0.88) | 35–45 | 17/485 (3.5) | 0.23 (0.11, 0.47) | 0.31 (0.15, 0.67) | Marital status | | | | Never married | 5/155 (3.2) | 1.0 | 1.0 | Divorced/separated/widowed | 15/629 (2.4) | 0.74 (0.27, 2.5) | 0.80 (0.28, 2.22) | Currently married | 89/730 (12.2) | 3.78 (1.81, 7.90) | 3.82 (1.83, 7.97) | Sexual partner past 6 months | | | | None | 63/970 (6.5) | 1.0 | | One | 44/493 (8.9) | 1.37 (0.92, 2.04) | | 2+ | 2/43 (4.7) | 0.72 (0.17, 3.07) | | Parity (ever live-births) | | | | Prime gravid | 41/545 (7.5) | 1.0 | | 1–3 | 26/353 (7.4) | 0.98 (0.57, 1.67) | | 4+ | 41/580 (7.1) | 0.94 (0.64, 1.38) | | Use of any medication to prevent pregnancy | | | | Not taking any | 106/1236 (8.6) | 1.0 | 1.0 | Taking some medications | 3/278 (1.1) | 0.13 (0.03, 0.47) | 0.09 (0.02, 0.33) | Breastfeeding | | | | Not breastfeeding | 103/1286 (8.0) | 1.0 | 1.0 | Yes breastfeeding | 6/228 (2.6) | 0.33 (0.17, 0.64) | 0.16 (0.08, 0.30) | WHO stage at initial screening | | | | I | 46/476 (9.7) | 1.0 | | II | 14/309 (4.5) | 0.47 (0.26, 0.84) | | III | 4/151 (2.7) | 0.27 (0.13, 0.58) | | IV | 5/40 (10.0) | 1.03 (0.53, 2.00) | | CD4 at initial screening | | | | <100 | 3/167 (1.8) | 1.0 | 1.0 | 100–250 | 16/312 (5.1) | 2.85 (0.89, 9.13) | 2.74 (0.85, 8.82) | 251–350 | 9/173 (5.2) | 2.90 (0.95, 8.83) | 2.22 (0.71, 6.98) | 351+ | 81/862 (9.4) | 5.23 (1.54, 17.74) | 4.71 (1.41, 15.80) |
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