Table 4.

Hepatitis B virus breakthrough infection among the studied children in different age groups

Age group (yr)	Total	Sero-protection rate		HBV infection markers
		Anti-HBs ≥ 10 IU/L
		n (%)	95%CI	Anti-HBc %	HBsAg %	HBV-DNA %
< 3	702	633 (90.2)	88.0-92.4	0 (0.0)	0 (0.0)	0 (0.0)
3-	705	557 (79.0)	76.0-82.0	1 (0.14)	0 (0.0)	1 (0.14)
7-	493	282 (57.2)	52.9-61.6	4 (0.81)	2 (0.41)	5 (1.00)
11-	875	335 (38.3)	35.1-41.5	4 (0.46)	1 (0.11)	4 (0.46)
≥ 15	825	252 (30.5)	27.4-33.6	4 (0.48)	1 (0.12)	4 (0.48)
Total	3600	2059 (57.2)	55.6-58.8	13 (0.36)	4 (0.11)	14 (0.39)

HBV: Hepatitis B virus; Anti-HBs: Hepatitis B surface antibody; Anti-HBc: Hepatitis B core antibody; HBsAg: Hepatitis B surface antigen.