Table 1.

Characteristics of HBsAg positive and HBsAg negative subjects in the Korean Cancer Prevention Study cohort (N=603,585)

Characteristic	HBsAg+ (N=53,045)	HBsAg− (N=550,540)
Sex, n (%)
Male	44,801 (84.5)	430,766 (78.2)
Female	8,244 (15.5)	119,774 (21.8)
Age in years at testing, n (%)
30–39	26,567 (50.1)	245,172 (44.5)
40–49	17,478 (33.0)	186,463 (33.9)
50–59	8307 (15.7)	106,245 (19.3)
60+	693 (1.3)	12,660 (2.3)
Median age	39	41
Calendar year at testing, n (%)
1992	46,015 (86.8)	446,841 (81.2)
1993	1269 (2.4)	27,349 (5.0)
1994	4962 (9.4)	61,242 (11.1)
1995	799 (1.5)	15,108 (2.7)
Alcohol use in grams/day, n (%)
0	18,983 (35.8)	191,731 (34.8)
1–24.9	24,998 (47.1)	263,418 (47.9)
25–49.9	5314 (10.0)	56,196 (10.2)
50–99.9	2833 (5.3)	29,209 (5.3)
100+	917 (1.7)	9,986 (1.8)
ALT, n (%)
Normal	40,394 (76.2)	495,880 (90.1)
Abnormal	12,651 (23.9)	54,660 (9.9)
AST, n (%)
Normal	42,788 (80.7)	512,626 (93.1)
Abnormal	10,257 (19.3)	37,914 (6.9)

Abbreviations: HBsAg hepatitis B surface antigen, ALT alanine aminotransferase, AST aspartate aminotransferase