Table 1.

Age-related characteristics of the study population

	Group 1 (n = 131)	Group 2 (n = 128)	Group 3 (n = 539)	Group 4 (n = 220)	Total (n = 1018)
	HIV screening centres	HIV screening centres	Hospitals	Health centres
	HIV-positive women	HIV-negative women	HIV status unknown	HIV status unknown
Age
Mean (years) ± SD	38.8 ± 9.1	29.4 ± 7.9	45.2 ± 11.0	48.0 ± 14.8	43.0 ± 12.8
Range (years)	20 – 59	17 - 51	20 – 76	20 – 82	17 - 82
n with available data	131	128	537	216	1012
Age of menarche
Mean (years) ± SD	15.0 ± 1.9	14.5 ± 1.5	14.2 ± 1.9	14.5 ± 2.0	14.3 ± 1.9
Range (years)	11 – 20	12- 17	10 – 21	10 - 20	10 - 21
n with available data	50	26	502	208	786
Age of first sexual intercourse
Mean (years) ± SD	17.2 ± 2.5	18.0 ± 3.2	18.8 ± 3.9	19.1 ± 4.5	18.5 ± 3.9
Range (years)	12 – 25	12 – 32	10 – 36	12 – 32	10 – 36
n with available data	127	125	523	207	982

n: number of participants with available data in each group; SD: standard deviation