Table 3.

Incidence of HIV (per 100 person-years) by round, socioeconomic status, sex, and age group.

	R02	R03	R04	R06	R07	R08	R09	R10	R11	R12	R13	R14	R15	R16	R17	R18	Model- based IRR	95% CI for IRR	P value for IRR
N	2542	3096	3349	2680	3660	4383	4468	4630	4805	4915	5485	5652	6086	6197	7034	7089
Round	1.45	1.25	1.79	0.91	1.03	1.25	1.17	1.18	1.10	1.18	1.22	1.08	0.84	0.66	0.66	0.40	0.39	0.32--0.47	P < 0.001
SES
Low SES	0.88	1.24	2.12	1.11	0.91	1.63	1.68	1.62	1.71	1.18	1.96	0.95	0.98	0.31	0.99	1.00	0.70	0 0.43--1.13	P = 0.148
Low-middle SES	1.78	1.46	1.92	0.80	1.49	1.62	1.53	1.55	1.35	1.81	1.58	1.30	1.06	1.01	0.89	0.38	0.52	0.36--0.75	P < 0.001
High-middle SES	1.90	0.98	1.78	0.93	0.87	1.12	0.91	1.05	1.03	0.97	1.06	1.29	1.06	0.90	0.82	0.43	0.55	0.37--0.80	P = 0.002
Highest SES	1.53	1.17	0.98	0.74	0.65	0.66	0.68	0.74	0.70	0.99	0.96	0.82	0.58	0.42	0.49	0.34	0.36	0.23--0.54	P < 0.001
Sex
Men	0.93	1.38	1.97	0.78	0.86	1.23	1.18	1.27	1.06	1.04	1.29	0.97	0.79	0.51	0.44	0.35	0.31	0.24--0.42	P < 0.001
Women	1.84	1.15	1.64	1.00	1.15	1.26	1.16	1.11	1.12	1.29	1.17	1.17	0.89	0.79	0.85	0.44	0.46	0.36--0.59	P < 0.001
Age group
15–24 years	1.31	0.76	2.04	0.71	1.18	1.34	1.32	1.05	0.97	1.12	0.84	1.14	0.74	0.73	0.71	0.20	0.37	0.27--0.52	P < 0.001
25–34 years	1.48	2.02	1.94	1.22	1.31	1.03	1.30	1.70	1.39	1.47	1.60	1.23	1.03	0.91	0.92	0.59	0.46	0.34--0.61	P < 0.001
35–49 years	1.63	1.11	1.20	0.75	0.43	1.41	0.75	0.61	0.80	0.83	1.06	0.82	0.73	0.36	0.38	0.40	0.33	0.22--0.49	P < 0.001
HIV incidence stratified by sex
Men
Lowest SES	0.66	1.34	2.80	0.95	0.52	1.19	1.65	2.16	1.85	1.18	1.90	0.89	1.05	0.60	0.76	0.94	0.65	0.33--1.31	P = 0.233
Low-middle SES	0.85	1.76	1.67	0.65	2.17	1.94	2.00	1.57	0.94	1.82	1.79	0.95	0.86	0.98	0.51	0.50	0.43	0.26--0.72	P = 0.001
High-middle SES	1.10	0.95	2.11	1.08	0.27	1.07	0.59	1.00	1.19	0.86	1.24	1.13	1.05	0.38	0.52	0.48	0.43	0.24--0.78	P = 0.005
Highest SES	1.53	1.43	0.96	0.31	0.30	0.70	0.61	0.77	0.61	0.66	0.78	0.86	0.53	0.43	0.36	0.18	0.28	0.15--0.55	P < 0.001
Women
Lowest SES	1.06	1.16	1.56	1.23	1.21	2.00	1.71	1.15	1.60	1.18	2.02	1.01	0.91	0.00	1.24	1.07	0.75	0.39--1.44	P = 0.386
Low-middle SES	2.45	1.21	2.12	0.90	1.02	1.36	1.18	1.53	1.66	1.81	1.39	1.63	1.25	1.04	1.26	0.26	0.61	0.36--1.02	P = 0.057
High-middle SES	2.52	1.00	1.54	0.82	1.29	1.16	1.12	1.08	0.92	1.05	0.91	1.43	1.06	1.32	1.08	0.39	0.65	0.39--1.08	P = 0.094
Highest SES	1.53	0.99	0.99	1.02	0.90	0.63	0.74	0.73	0.76	1.27	1.10	0.79	0.63	0.42	0.61	0.47	0.42	0.24--0.72	P = 0.001
Men
15–24 years	0.79	0.81	1.25	0.51	0.51	1.05	1.22	1.24	0.38	0.69	0.64	0.90	0.52	0.21	0.25	0.24	0.28	0.16--0.47	P < 0.001
25–34 years	1.46	1.90	3.27	1.11	1.69	0.97	1.48	1.80	1.72	1.50	1.96	1.07	1.36	1.06	0.77	0.57	0.40	0.26--0.60	P < 0.001
35–49 years	0.49	1.74	1.35	0.62	0.00	1.98	0.66	0.45	0.86	0.81	1.14	0.92	0.45	0.28	0.34	0.28	0.26	0.14--0.47	P < 0.001
Women
15–24 years	1.74	0.72	2.71	0.85	1.62	1.56	1.39	0.91	1.42	1.50	1.05	1.39	0.97	1.29	1.23	0.16	0.48	0.32--0.73	P < 0.001
25–34 years	1.50	2.14	0.76	1.31	0.96	1.08	1.15	1.62	1.15	1.46	1.34	1.35	0.79	0.80	1.03	0.60	0.54	0.35--0.82	P = 0.004
35–49 years	2.31	0.76	1.12	0.82	0.67	1.04	0.81	0.72	0.75	0.85	1.00	0.73	0.96	0.44	0.41	0.49	0.40	0.23--0.67	P = 0.001

Tests for trend assess the effect of time/round on HIV incidence and considers all survey rounds. Tests were performed using Poisson models with generalized estimating equations with exchangeable correlation structure.

N is the number of individuals with household data on SES and included in incidence analyses. N averaged 4754 individuals per round and 21 143 unique individuals over all rounds. Model based IRR is for R18 (round 18) versus R02 (round 2).