Characteristics of 5,494 women at time of HAART initiation, and a subpopulation of 541 of those women at time of incident pregnancy, in Johannesburg, South Africa from 1 April 2004 to 30 September 2009.

d4T: stavudine. 3TC: lamivudine. EFV: efavirenz. NVP: nevirapine. LPVr: Lopinavir-ritonavir (Kaletra). Categorical variables are expressed as number (% of total non-missing); continuous variables are expressed as median (interquartile range).*These measures are baseline measures, not updated to time of incident pregnancy.‡After adjustment for altitude, lower limit of normal hemoglobin is 11.35 g/dl.†Baseline viral load was missing in 3951 (72%) women at baseline, and in 68 of women at time of exposure.