Table 2.
Characteristics of cases and controls in this study
| Variables | Laryngeal Cancer | Esophageal Cancer | ||||
|
| ||||||
| Case (N = 180) | Control (N = 310) | P-value | Case (N = 360) | Control (N = 310) | P-value | |
|
| ||||||
| Gender | < 0.001a | < 0.001a | ||||
| Male (%) | 172 (95.6) | 197 (63.5) | 288 (80) | 197 (63.5) | ||
| Female (%) | 8 (4.4) | 113 (36.5) | 72 (20) | 113 (36.5) | ||
| Age | ||||||
| Mean age ± SD | 60.7 ± 10.1 | 49.4 ± 7.9 | < 0.001b | 60.7 ± 8.9 | 49.4 ± 7.9 | < 0.001b |
| Smoking status | < 0.001a | |||||
| Nonsmoking (%) | 40 (22.2) | 210 (69.8) | ||||
| Smoking (%) | 140 (77.8) | 91 (30.2) | ||||
|
| ||||||
| Variables | Gastric Cancer | Colorectal Cancer | ||||
|
| ||||||
| Case (N = 588) | Control (N = 703) | P-value | Case (N = 449) | Control (N = 703) | P-value | |
|
| ||||||
| Gender | < 0.001a | 0.598a | ||||
| Male (%) | 392 (66.7) | 396 (56.3) | 260 (57.9) | 396 (56.3) | ||
| Female (%) | 196 (33.3) | 307 (43.7) | 189 (42.1) | 307 (43.7) | ||
| Age | ||||||
| Mean age ± SD | 58.1 ± 11.7 | 48.6 ± 9.4 | < 0.001c | 59.1 ± 11.8 | 48.6 ± 9.4 | < 0.001c |
a
P values were calculated from two-sided chi-square tests.
b
P values were calculated by Student t tests.
c
P values were calculated by Welch’s t tests.