Table 2. Factors associated with recent HIV infection (reference group for comparison: HIV negative) in the 2017 Antenatal HIV Sentinel Survey, South Africa.

	N (%)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)
N = 32,716
Marital status
Single	23,255 (71.7)	2.9 (1.7–5.1)	3.4 (1.8–6.2)
Cohabiting	3,060 (9.8)	3.3 (1.7–6.5)	3.8 (1.8–7.7)
Married	5,633 (18.5)	1.0	1.0
Visit type
First ANC visit attendees	12,322 (40.3)	1.6 (1.2–2.1)	1.6 (1.2–2.2)
Follow–up ANC visit attendees	19,898 (59.7)	1.0	1.0
Age gap with partner among 15–24 years
Partner older by ≥5 years	4,363 (35.6)	3.1 (2.1–4.7)	3.1 (2.0–4.7)
Partner not older by ≥5 years	8,090 (64.4)	1.0	1.0
Age gap with partner among 25–49 years
Partner older by ≥5 years	4,983 (31)	1.7 (1.1–2.8)	1.6 (0.9–2.6)
Partner not older by ≥5 years	11,320 (69)	1.0	1.0
Age of woman (among women with partner ≥5 years older)
15–24 years	4,363 (45.9)	1.4 (0.9–2.2)	1.4 (0.8–2.3)
25–49 years	4,983 (54.2)	1.0	1.0
Age of woman (among women with partner not older by ≥5 years)
15–24 years	8,090 (40.8)	0.8 (0.5–1.2)	0.7 (0.5–1.1)
25–49 years	11,320 (59.2)	1.0	1.0

Missing values excluded from logistic regression. N = 27,226 observations (83.2% of data) included in multivariable analysis. P value for interaction between age and age–disparate relationship = 0.045. The section of the multinomial model comparing HIV negative participants with long–term infected was not presented in this table as this was not the primary interest of this study. OR: odds ratio; ANC: Antenatal care. This model is adjusted for gravidity and education.