Biological demographics of the study cohort compared to infants who became infected with HIV.
| Baseline cohort (n=1219) | Baseline cohort excluding LTFU (n=944) | HIV seroconverters (n=8) | Birth transmissions (n=4) | Breastfeeding transmissions (n=4) | |
| Infant sex | |||||
| Female (N (%)) | 566 (46) | 441 (47) | 5 (62.5) | 2 (50) | 3 (75) |
| Male (N (%)) | 653 (54) | 503 (53) | 3 (37.5) | 2 (50) | 1 (25) |
| Maternal age (median (IQR)) | 29.5 (25.9–33.7) | 29.0 (26.0–34.0) | 28.5 (25.8–33.6) | 27.5 (25.0–30.0) | 30 (26.8–33.3) |
| Maternal CD4 count (median (IQR)) | 450 (318.0–600.0)* | 460 (324.0–601.5) † | 228 (145.5–262.5) | 195.5 (94.5–240.0) | 233 (181.0–322.0) |
| Percentage of cohort with maternal CD4 <350 (N (%)) | 308 (32)* | 203 (25)† | 7 (88) | 4 (100) | 3 (75) |
| Vaginal delivery (N (%)) | 779 (64)‡ | 600 (63.5) | 5 (62.5) | 1 (25) | 4 (100) |
| Caesarean delivery (N (%)) | 439 (36) | 344 (36.5) | 3 (37.5) | 3 (75) | 0 (0) |
| Infant birth weight kg (median (IQR)) | 3.1 (2.9–3.4) | 3.1 (2.9–3.4) | 3.2 (3.1–3.2) | 3.2 (3.1–3.2) | 3.5 (3.2–3.7) |
*CD4 count data were self-recalled from mothers (259 mothers either did not know or could not recall their most recent CD4 count at baseline).
†CD4 count data were self-recalled from mothers (194 mothers either did not know or could not recall their most recent CD4 count at baseline).
‡Birth mode data missing for one infant.
LTFU, Lost to follow up.