Table 2. HBV (HBsAg) incidence rate in different genders and age groups.

Groups	Sample size	No. of new infections	Average interval of follow–up (years)	Total person-years of follow-up	Incidence rate*	95% CI for Incidence rate (%)*
Males	128344	2483	1.98	254121.12	0.98	0.92–1.03
Females	189617	2918	1.97	373545.49	0.78	0.74–0.82
0–4	384	0	2.78	1067.52	0.00	0.00–0
5–9	1778	2	2.31	4107.18	0.05	0–0.15
10–14	3700	11	2.06	7622.00	0.14	0.02–0.27
15–19	2347	32	1.95	4576.65	0.70	0.36–1.04
20–24	3547	63	2.03	7200.41	0.87	0.57–1.18
25–29	5747	109	2.05	11781.35	0.93	0.68–1.18
30–34	10512	255	2.04	21444.48	1.19	0.98–1.40
35–39	22127	512	2.00	44254.00	1.16	1.01–1.30
40–44	34751	766	1.97	68459.47	1.12	1.01–1.23
45–49	39821	791	1.96	78049.16	1.02	0.92–1.11
50–54	41716	758	1.97	82180.52	0.92	0.83–1.02
55–59	46647	718	1.97	91894.59	0.78	0.70–0.86
60–64	41562	632	1.94	80630.28	0.78	0.70–0.87
65–69	25089	341	1.95	48923.55	0.70	0.60–0.80
70–74	21952	246	1.98	43464.96	0.57	0.47–0.67
75–79	15087	158	1.94	29268.78	0.54	0.42–0.66
80+	1194	7	1.69	2017.86	0.35	0.01–0.68
All	317961	5401	1.97	626383.17	0.86	0.83–0.89
Standardized#					0.81	0.77–0.85

^*Per 100 person-years.

^#Adjusted by gender and age of the standardized population.