Demographic characteristics of cases and controls (N=234)
| Cases (N=109) | Controls (N=125) | χ2* | df | p Value | |
| N (%) | N (%) | ||||
| Sex | |||||
| Male | 86 (78.9) | 102 (81.6) | 0.27 | 1 | 0.60 |
| Female | 23 (21.1) | 23 (18.4) | |||
| Age group, years | |||||
| ≤39 | 5 (4.6) | 5 (4.0) | 0.36 | 1 | 0.95 |
| 40–49 | 24 (22.0) | 31 (24.8) | |||
| 50–59 | 55 (50.5) | 63 (50.4) | |||
| ≥60 | 25 (22.9) | 26 (20.8) | |||
| Cigarette smoking | |||||
| Never smoker | 67 (61.5) | 88 (70.4) | 5.44 | 1 | 0.07 |
| Ever smoker | 11 (10.1) | 17 (13.6) | |||
| Current smoker | 31 (28.4) | 20 (16.0) | |||
| Alcohol use | |||||
| Never user | 69 (63.3) | 89 (71.2) | 1.66 | 1 | 0.44 |
| Ever user | 11 (10.1) | 10 (8.0) | |||
| Current user | 29 (26.6) | 26 (20.8) | |||
↵* χ2 test for trend for age group, cigarette smoking and alcohol use.