Table 1.

Baseline characteristics of women in analytic sample

	All	30–34	35–39	40–44	45–50
Sample size	1,734	491	368	424	451
Number of subsequent seroconversions	116	48	22	27	19
Age at baseline	40 (34 to 45)	31 (30 to 33)	37 (36 to 38)	42 (41 to 43)	47 (46 to 49)
Partner age disparity in most recent relationship	4 (2 to 9)	5 (2 to 8)	5 (2 to 9)	4 (2 to 9)	4 (2 to 8)
Highest educational attainment
None or Primary (0–7 years)	50.0	22.4	48.9	60.8	70.7
Secondary (8–12 years)	40.6	63.5	41.8	31.6	23.1
Tertiary	9.4	14.1	9.2	7.5	6.2
Household wealth quintile
Lowest	20.0	16.9	19.3	20.5	23.3
2nd lowest	27.1	27.9	23.1	28.5	28.2
Middle	26.4	26.7	29.3	26.4	23.7
2nd highest	15.7	15.3	18.2	15.8	14.2
Highest	10.8	13.2	10.1	8.7	10.6
Marital status
Never Married	28.0	45.6	29.9	19.3	15.3
Engaged	20.4	25.3	18.2	20.8	16.4
Married	48.1	28.7	49.7	55.4	61.0
Divorced/Separated/Widowed	3.6	0.4	2.2	4.5	7.3
Age at sexual debut	18 (16 to 19)	18 (16 to 19)	17 (16 to 18)	17 (16 to 19)	18 (16 to 19)
Multiple partners in past 12 months	0.9	1.0	0.5	1.4	0.7
Casual partner in past 12 months	0.9	1.2	0.5	0.9	0.7
Lowest condom use level in relationships in past 12 months
Never	81.3	69.2	84.0	85.4	88.5
Sometimes	14.0	23.2	11.1	10.4	9.5
Always	4.7	7.5	4.9	4.2	2.0

Figures for categorical data are percentages; figures for continuous data are medians and (Interquartile ranges).