| Characteristics | Number of women | Incident pregnancy/pyrs | Incidence/100 pyrs (95% CI) | IRR (95% CI) | Adjusted IRR (95% CI) |
| Overall | 244 | 48/195.5 | 24.6 (18.1, 32.6) | | | Baseline and week 12 CD4 | | | | | | Both <100 | 18 | 1/14.69 | 6.8 (0.17, 37.92) | 1.0 | 1.0 | Both 100+ | 182 | 39/145.50 | 26.8 (19.06, 36.64) | 3.94 (0.68, 22.70) | 4.12 (0.75, 22.50) | Base CD4 <100, wk12 100+ | 44 | 8/35.38 | 22.6 (9.76, 44.55) | 3.32 (0.50, 2.26) | 3.24 (0.46, 22.60) | Age (years) | | | | | | 15–24 | 19 | 6/14.31 | 41.9 (15.39, 91.26) | 1.0 | 1.0 | 25–34 | 133 | 34/103.94 | 32.7 (22.65, 45.71) | 0.78 (0.44, 1.39) | 0.82 (0.38, 1.77) | 35–45 | 92 | 8/77.31 | 10.3 (4.47, 20.39) | 0.25 (0.13, 0.46) | 0.27 (0.15, 0.50) | Desire for more children | | | | | | Both do not want | 179 | 34/144.52 | 23.5 (16.29, 32.88) | 1.0 | 1.0 | Only male wants | 35 | 6/28.88 | 20.8 (7.62, 45.23) | 0.88 (0.33, 2.33) | 0.81 (0.36, 1.84) | Only female wants | 8 | 1/6.13 | 16.3 (0.41, 90.89) | 0.69 (0.12, 4.12) | 0.50 (0.09, 2.81) | Both want | 22 | 7/16.04 | 43.6 (17.55, 89.92) | 1.85 (0.84, 4.10) | 1.07 (0.43, 2.63) | Marital status | | | | | | Not married | 142 | 23/117.13 | 19.6 (12.45, 29.46) | 1.0 | 1.0 | Married | 102 | 25/78.44 | 31.9 (20.63, 47.05) | 1.62 (0.81, 3.25) | 1.41 (0.76, 2.59) | HIV status disclosure | | | | | | Not to anybody | 58 | 15/45.69 | 32.8 (18.37, 54.15) | 1.0 | 1.0 | Yes, to somebody | 186 | 33/149.88 | 22.0 (15.16, 30.92) | 0.67 (0.38, 1.19) | 0.69 (0.36, 1.32) |
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Family planning method | | | | | | None | 69 | 18/51.83 | 34.7 (20.58, 54.89) | 1.0 | | Condom only | 45 | 12/35.45 | 33.8 (17.49, 59.13) | 0.97 (0.47, 2.00) | | Other | 11 | 2/8.34 | 24.0 (2.91, 86.67) | 0.69 (0.16, 3.08) | |
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BMI at week 12 | | | | | | Under weight, <18.5 | 24 | 5/18.11 | 5 (8.96, 64.43) | 1.0 | | Normal weight | 139 | 28/113.83 | 24.5 (16.35, 35.55) | 0.89 (0.29, 2.72) | | Overweight/obese | 33 | 5/27.23 | 18.4 (5.96, 42.85) | 0.67 (0.14, 3.16) | |
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WHO stage at week 12 | | | | | | I & II | 94 | 19/75.81 | 25.1 (15.09, 39.14) | 1.0 | | III & IV | 48 | 6/39.27 | 15.3 (5.61, 33.26) | 0.61 (0.23, 1.63) | |
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