Table 1: Main maternal, gestational, birth and neonatal clinical and biological variables. Figures expressed as number (percentages), except when stated otherwise.

Mothers (n = 106) Caucasian AIDS Substance abuse Cigarettes Methadone Heroin Cocaine Alcohol Others Multidrug (2 or more drugs) HCV co-infection	84 (79.2) 5 (4.7) 38 (35.8) 31 (29.2) 10 (9.4) 4 (3.8) 2 (1.9) 3 (2.8) 6 (5.7) 7 (6.6) 42 (39.6)
Gestation and delivery (n = 114) Mother’s age, mean (SD)	30.5 (5.2)
ARV treatment during pregnancy
No treatment ZDV monotherapy HAART From 1^st trimester PI-based NNRTI-based CD4+ cell count at delivery (cells/mm^3), mean (SD) Undetectable viremia at delivery Elective caesarian section	6 (5.3) 8 (7.0) 100 (87.7) 63 (55.3) 48 (42.1) 56 (49.1) 578 (340) 84 (73.7) 83 (72.8)
Intrapartum ARV treatment
No treatment Intravenous ZDV	7 (6.1) 103 (90.4)
Newborn (n = 118)
Female Apgar below 8 at 1 or 5 minutes Gestational age (weeks), mean (SD) Birth weight (g), mean (SD)	53 (44.9) 7 (5.9) 37.6 (1.1) 2880 (440)
ARV prophylaxis in newborn
Oral ZDV Others	107 (90.7) 11 (9.3)

ARV: Antiretroviral; HCV: Hepatitis C virus; ZDV: Zidovudine; HAART: Highly active antiretroviral therapy; PI: Protease inhibitor; NNRTI: Non-nucleoside reverse transcriptase inhibitors.