Table 1.

Comparing characteristics of the study subjects

CasesControls
Variablen = 447n = 580P
Male, n (%)430 (96.2)565 (97.4)0.2658
Age, year (SD)56.6 (10.5)51.4 (13.5)0.0004
 <4021 (4.7)113 (19.5)
 40 ≤ age < 50101 (22.6)145 (25)
 50 ≤ age < 60138 (30.9)169 (29.1)
 ≥60187 (41.8)153 (26.4)
Cigarette, n (%)
 None55 (12.3)298 (51.4)
 Ever213 (47.7)108 (18.7)
 Current179 (40.0)174 (30.9)<0.0001
Alcohol, n (%)
 None124 (27.7)434 (74.8)
 Ever191 (42.7)40 (6.9)
 Current132 (29.6)106 (18.3)<0.0001
BQ chewing, n (%)
 None75 (16.8)506 (87.2)
 Ever303 (67.8)57 (9.8)
 Current69 (15.4)17 (2.9)<0.0001