Table 2.

HBV prevalence in different genders and age groups in fixed cohort

Groups	Group size	Round 1			Round 2
		No. of HBsAg positive	HBsAg positive rate(%)	95% CI(%)	No. of HBsAg positive	HBsAg positive rate(%)	95% CI(%)
25–29	11	3	27.3	−4.1–58.7	3	27.3	−4.1–58.7
30–34	70	15	21.4	11.6–31.3	16	22.9	12.8–32.9
35–39	107	8	7.5	2.4–12.5	7	6.5	1.8–11.3
40–44	254	37	14.6	10.2–18.9	36	14.2	9.9–18.5
45–49	545	56	10.3	7.7–12.8	67	12.3	9.5–15.1
50–54	683	61	8.9	6.8–11.1	79	11.6	9.2–14.0
55–59	663	57	8.6	6.5–10.7	76	11.5	9.0–13.9
60–64	887	71	8.0	6.2–9.8	86	9.7	7.7–11.6
65–69	949	57	6.0	4.5–7.5	57	6.0	4.5–7.5
70–74	643	44	6.8	4.9–8.8	39	6.1	4.5–7.9
75–79	518	24	4.6	2.8–6.4	19	3.7	2.0–5.3
>80	1047	37	3.5	2.4–4.7	34	3.2	2.2–4.3
All	6377	470	7.4	6.7–8.0	519	8.1	7.5–8.8