Association between Single-Nucleotide Polymorphism in MicroRNA Target Site of DDB2 and Risk of Hepatocellular Carcinoma in a Southern Chinese Population

Table 1

Frequency distributions of selected variables in HCC cases and controls.

Variables	Cases n (%)	Controls n (%)
All subjects	1073	1119
Age			0.172
≤48^b	522 (48.6)	577 (51.6)
>48	551 (51.4)	542 (48.4)
Sex			0.338
Males	946 (89.5)	1001 (88.2)
Females	127 (10.5)	118 (11.8)
Smoking			<0.001
Never	625 (58.2)	866 (77.4)
Ever	448 (41.8)	253 (22.6)
Drinking			<0.001
Never	655 (61.0)	894 (79.9)
Ever	418 (39.0)	225 (20.1)
HBV infection			<0.001
(−)	174 (16.2)	1005 (89.8)
(+)	899 (83.8)	114 (10.2)

^aTwo-sided Chi-squared test. ^bThe median age of this population.