Risk factors for early postnatal HIV transmission ≤4 months of age among 734 infants born to HIV-infected women in Lusaka, Zambia

*Non-exclusive breastfeeding coded as a time-dependent covariate
†Maternal plasma viral load coded as a continuous variable indicating transmission risk per log10 increase
‡A dummy variable for missing RPR status was included in the adjusted model to avoid excluding those missing their RPR status data (n = 47)
§Low birthweight was included in the adjusted model because its inclusion reduced the magnitude of the association between non-exclusive breastfeeding and transmission
¶The adjusted model included simultaneously the five covariates displayed in the final column.