Table 1. Distributions of characteristics among HCC patients and controls in our study.

	Cases (n = 1,081)	Controls (n = 2,008)	P value
	N (%)	N (%)
Age (Mean ± SD)	54.96±11.37	55.56±10.28	0.149
Gender			0.937
Male	866 (80.1)	1,611 (80.2)
Female	215 (19.9)	397 (19.8)
Smoking status			1.611×10−9
Never	419 (38.8)	1,011 (50.3)
Ever	647 (59.9)	982 (48.9)
Unknown	15 (1.4)	15 (0.7)
Drinking status			2.583×10−6
Never	486 (45.0)	1,092 (54.4)
Ever	572 (52.9)	898 (44.7)
Unknown	23 (2.1)	18 (0.9)

Abbreviations: SD, standard deviation.