Table 1: Frequency distribution of selected variables of the bladder cancer cases and controls.

VariablesCases ( )Controls ( )
% % 

Age (year)
 <6528947.533149.4 0.486
 ≥6532052.533950.6
Sex
 Male48479.550675.5 0.091
 Female12520.516424.5
Smoking status
 Never31752.142663.6<0.001
 Ever29247.924436.4
Drinking status
 No41868.648271.9 0.196
 Yes19131.418828.1
Family history of cancer
 No44072.262292.8<0.001
 Yes16927.8 48 7.2
Tumor stage
 Nonmuscle invasive 46676.5
 Muscle invasive14323.5
Tumor grade
 Grade 129848.9
 Grade 219431.9
 Grade 311719.2

Student’s -test for age distribution between the cases and controls; two-sided test for other selected variables between the cases and controls.