Table 1.

Baseline Characteristics of the Cohort, Taiwan, 1991–2004

Characteristic	All Participants		Body Mass Indexc <30				Body Mass Indexc ≥30
			No Alcohol Use		Alcohol Use		No Alcohol Use		Alcohol Use
	No.	%	No.	%	No.	%	No.	%	No.	%
No. of participantsa	23,712		20,164		2,401		1,028		119
No. of hepatocellular carcinoma cases	305		225		59		12		9
Age, yearsb	47.3 (10.0)		47.1 (10.0)		48.4 (10.1)		49.6 (9.1)		47.3 (10.0)
Body mass indexb,c	24.0 (3.4)		23.6 (2.9)		23.8 (2.8)		32.2 (2.4)		31.9 (1.9)
Alcohol use
No	21,192	89.4	20,164	100.0	0	0.0	1,028	100.0	0	0.0
Yes	2,520	10.6	0	0.0	2,401	100.0	0	0.0	119	100.0
Smokingd
No	16,854	71.1	15,405	76.4	572	23.8	835	81.2	42	35.3
Yes	6,851	28.9	4,753	23.6	1,828	76.2	193	18.8	77	64.7
Hepatitis B surface antigen status
Seronegative	19,574	82.6	16,675	82.7	1,946	81.1	863	84.0	90	75.6
Seropositive	4,138	17.5	3,489	17.3	455	19.0	165	16.1	29	24.4
Hepatitis C virus statuse
Seronegative	22,371	94.5	19,001	94.4	2,303	96.0	954	93.1	113	95.0
Seropositive	1,308	5.5	1,135	5.6	96	4.0	71	6.9	6	5.0
Alanine aminotransferase, U/L
<45	22,891	96.5	19,557	97.0	2,264	94.3	964	93.8	106	89.1
≥45	821	3.5	607	3.0	137	5.7	64	6.2	13 9	10.
Diabetesf
No	23,061	97.49	19,635	97.6	2,328	97.2	985	96.0	113	95.0
Yes	593	2.51	479	2.4	67	2.8	41	4.0	6	5.0

^a We excluded 108 subjects because of missing data on either body mass index or alcohol use.

^b Values are expressed as mean (standard deviation).

^c Weight (kg)/height (m)².

^d We were missing data on smoking for 7 out of 23,712 subjects.

^e We were missing data on anti-hepatitis C virus for 33 out of 23,712 subjects.

^f We were missing data on history of diabetes for 58 out of 23,712 subjects.