Table 1.

Incidence of HIV-1 seroconversion by sociodemographic variables, 2004–12

	Person-years	Number of HIV seroconversions	HIV incidence*(95% CI)
Calendar year
2004	5552	208	3·75 (3·27–4·29)
2005	7060	269	3·81 (3·38–4·29)
2006	7575	321	4·24 (3·80–4·73)
2007	7347	268	3·65 (3·24–4·11)
2008	7102	275	3·87 (3·44–4·36)
2009	6389	237	3·71 (3·27–4·21)
2010	5724	203	3·55 (3·09–4·07)
2011	4858	164	3·38 (2·90–3·93)
2012	3239	92	2·84 (2·32–3·48)
Age-sex stratum
Women aged 15–19 years	9179	451	4·91 (4·48–5·39)
Women aged 20–24 years	7478	583	7·80 (7·19–8·46)
Women aged 25–29 years	3140	204	6·50 (5·66–7·45)
Women aged 30–34 years	2271	96	4·23 (3·46–5·16)
Women aged 35–39 years	2795	70	2·50 (1·98–3·17)
Women aged 40–44 years	3513	77	2·19 (1·75–2·74)
Women aged ≥45 years	5349	73	1·36 (1·09–1·72)
Men aged 15–19 years	8373	75	0·90 (0·71–1·12)
Men aged 20–24 years	5848	192	3·28 (2·85–3·78)
Men aged 25–29 years	2082	97	4·66 (3·82–5·68)
Men aged 30–34 years	1171	38	3·25 (2·36–4·46)
Men aged 35–39 years	1039	31	2·98 (2·10–4·24)
Men aged 40–44 years	1076	24	2·23 (1·50–3·33)
Men aged ≥45 years	1531	26	1·70 (1·16–2·49)
Knows HIV status
Yes	36 596	1372	3·75 (3·56–3·95)
No	4331	131	3·02 (2·55–3·59)
Refused	13 918	534	3·84 (3·52–4·18)
Has heard about antiretroviral therapy
Yes	23 614	880	3·73 (3·49–3·98)
No	4452	134	3·01 (2·54–3·56)
Refused	26 778	1023	3·82 (3·59–4·06)
Area of residence
Peri-urban	16 597	724	4·36 (4·06–4·69)
Rural	36 613	1248	3·41 (3·22–3·60)
Urban	1634	65	3·98 (3·12–5·07)
Household wealth quintile
Poorest	11 117	368	3·31 (2·99–3·67)
Second poorest	12 251	437	3·57 (3·25–3·92)
Third poorest	11 916	467	3·92 (3·58–4·29)
Fourth poorest	10 981	464	4·23 (3·86–4·63)
Wealthiest	8580	301	3·51 (3·13–3·93)
Changes of household residencies
None	50 481	1828	3·62 (3·46–3·79)
One	3642	169	4·64 (3·99–5·39)
Two or more	722	40	5·54 (4·06–7·55)

^*New infections per 100 person-years.