Basic characteristics of lung cancer cases and controls
| Characteristic | Cases (n=41) | Controls (n=205) | p Value* | ||
| n (%) | Mean (SD) | n (%) | Mean (SD) | ||
| Age, years | 66.4 (7.8) | 66.0 (9.1) | 0.788 | ||
| Age at first exposure, years | 32.0 (9.0) | 30.3 (8.3) | 0.178 | ||
| Exposure group | 0.001 | ||||
| High exposure | 22 (53.7) | 49 (23.9) | |||
| Medium exposure | 9 (22.0) | 66 (32.2) | |||
| Low exposure | 10 (24.4) | 90 (43.9) | |||
| Exposure duration, years | 24.8 (7.7) | 25.4 (9.0) | 0.661 | ||
| Smoking | 37 (90.2) | 149 (72.7) | 0.017 | ||
| Asbestosis | 0.006 | ||||
| None | 25 (61.0) | 168 (82.0) | |||
| Asbestosis I | 14 (34.1) | 28 (13.7) | |||
| Asbestosis II | 2 (4.9) | 9 (4.4) | |||
| Death | 41 (100.0) | 43 (21.2) | <0.001 | ||
↵* The t-test was used for continuous variables and the χ2 test for categorical variables.