Table 1 Distribution of demographic variables in lung cancer and controls
| Risk factor | Lung cancer | Controls | P |
|---|---|---|---|
| (N = 507) | (N = 542) | ||
| Age (mean ± SD) | 59.20 ± 9.872 | 58.10 ± 11.504 | 0.096 |
| Gender | |||
| Male | 255 (50.3%) | 262 (48.3%) | 0.527 |
| Female | 252 (49.7%) | 280 (51.7%) | |
| Smoking status | |||
| Ever | 217 (42.8%) | 66 (12.2%) | < 0.001 |
| Never | 290 (57.2%) | 476 (87.8%) | |
| Stage | |||
| I,II | 93 (18.3%) | ||
| III | 146 (28.8%) | ||
| IV | 84 (16.6%) | ||
| Missing | 184 (36.3%) | ||
| Pathological type | |||
| AD | 248 (48.92%) | ||
| SQ | 125 (24.65%) | ||
| SCC | 90 (17.75%) | ||
| Else | 44 (8.68%) | ||
