Seroepidemiology of hepatitis B virus infection and impact of vaccination

Table 1 Characteristics of the study population n (%)

Variables		Value
Age (yr)	1-4	1175 (0.79)
	5-19	28046 (18.83)
	≥ 20	119710 (80.38)
Sex	Male	67319 (45.20)
	Female	81612 (54.80)
Marital status (≥ 20 yr)	Unmarried	6614 (5.53)
	Married	106395 (88.88)
	Divorced	6264 (5.23)
	Unknown	437 (0.37)
Education (≥ 20 yr)	Illiterate or primary school	68552 (57.27)
	Middle school	43460 (36.31)
	College school	7097 (5.93)
	Unknown	599 (0.50)
Occupation (≥ 20 yr)	Agricultural worker	40363 (33.72)
	Worker	40530 (33.86)
	Student	1248 (1.04)
	Civil servant	5129 (4.28)
	Public service worker	5222 (4.36)
	Unemployed	21763 (18.18)
	Others	4883 (4.08)
	Unknown	572 (0.48)
Smoking status (≥ 20 yr)	Never	87144 (72.80)
	Current	27024 (22.57)
	Past	2731 (2.28)
	Unknown	2811 (2.35)
Drinking status (≥ 20 yr)	Never	95470 (79.75)
	Frequently	5900 (4.93)
	Every day	2132 (1.78)
	Unknown	16208 (13.54)
BMI (kg/m2) (≥ 20 yr)	< 18.5	4238 (3.54)
	18.5-24	59117 (49.38)
	24-28	41559 (34.72)
	≥ 28	14796 (12.36)
History of hypertension (≥ 20 yr)	No	99327 (82.97)
	Yes	20383 (17.03)
History of diabetes (≥ 20 yr)	No	116701 (97.49)
	Yes	3009 (2.51)
Familial history of HBV	No	132997 (91.06)
	Yes	12016 (8.23)
	Unknown	1034 (0.71)
Immunization history of HBV	No	75868 (51.77)
	Yes	50233 (34.28)
	Unknown	20444 (13.95)

BMI: Body mass index.