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.