Table 1. Baseline characteristics and HIV incidence according to characteristics of pregnant women and their partners in South Africa.

	Total, N (%)	Infections/ 100 PY	Incidence rate per 100 PY (95% CI)	P-value*
Overall	1356 (100.0)	11/828.3	1.33 (0.74–2.40)	-
Age at baseline				0.0303$
14–19 years	410 (30.2)	0/248.9	0 (0–1.48)
20–24 years	488 (36.0)	5/305.4	1.63 (0.68–3.93)
≥ 25 years	458 (33.8)	6/273.9	2.19 (0.98–4.88)
Gestational age at first visit
< 14 weeks	427 (31.5)	4/278.2	1.44 (0.54–3.83)	0.853
14–27 weeks	882 (65.0)	7/526.1	1.33 (0.63–2.78)
≥ 28 weeks	47 (3.5)	0/24.0	0 (0–15.3)
Requested contraception counselling?				0.72
Yes	892 (65.8)	9/631.7	1.42 (0.74–2.73)
No	464 (34.2)	2/196.5	1.01 (0.25–4.06)
Support to access social security grant				0.748
Support given	954 (70.4)	9/693.7	1.30 (0.67–2.49)
Support not given	402 (29.7)	2/134.5	1.49 (0.37–5.94)
Required gender-based violence counselling or referral				0.368
No	1264 (93.2)	11/769.5	1.43 (0.79–2.58)
Yes	92 (6.8)	0/58.7	0 (0–6.2)
Initial circumcision status of partner				0.011
circumcised	625 (46.1)	1/393.0	0.25 (0.04–1.80)
not circumcised	484 (35.7)	7/303.9	2.30 (1.10–4.83)
not recorded	247 (18.2)	3/131.4	2.28 (0.73–7.07)
Partners HIV status				<0.0001
HIV uninfected	717 (52.9)	0/544.1	0 (0–0.7)
Known HIV infected at enrolment	4 (0.3)	1/2.48	40.3 (5.67–286.0)
Newly diagnosed HIV-infected	5 (0.4)	4/1.81	221.4 (83.1–590)
not HIV tested/unknown status	630 (46.5)	6/279.9	2.1 (0.96–4.77)

*P-values estimated by the log-rank test comparing HIV incidence.

^$log-rank test for trend.

PY-person years.