Table S2. Demographics and clinical characteristics of studied samples.
| Characteristics | Southern samples, N (%) | Eastern samples, N (%) | Pearson χ2 | P |
|---|---|---|---|---|
| Total | 182 (65.9) | 94 (34.1) | ||
| Age(years) | ||||
| <60 | 105 (57.7) | 51 (54.3) | 0.298 | 0.585 |
| ≥60 | 77 (42.3) | 43 (45.7) | ||
| Sex | ||||
| Female | 52 (28.6) | 28 (29.8) | 0.045 | 0.8329 |
| Male | 130 (71.4) | 66 (70.2) | ||
| Family history of cancer | ||||
| No | 161 (88.5) | 84 (89.4) | 0.050 | 0.822 |
| Yes | 21 (11.5) | 10 (10.6) | ||
| Smoking | ||||
| No | 67 (36.8) | 30 (31.9) | 0.653 | 0.419 |
| Yes | 115 (63.2) | 64 (68.1) | ||
| Drinking | ||||
| No | 137 (75.3) | 73 (77.7) | 0.194 | 0.660 |
| Yes | 45 (24.7) | 21 (23.3) | ||
| Gold stage | ||||
| I + II | 71 (39.0) | 29 (30.1) | 2.287 | 0.515 |
| III + IV | 111 (61.0) | 65 (69.9) | ||
| Histological types | ||||
| Adenocarcinoma | 86 (47.3) | 41 (43.6) | 1.681 | 0.794 |
| Squamous cell carcinoma | 51 (28.0) | 31 (33.0) | ||
| Large cell carcinoma | 6 (3.3) | 5 (5.3) | ||
| Small cell lung cancer | 19 (10.4) | 8 (8.5) | ||
| Other carcinomas* | 20 (11.0) | 9 (9.6) |
*, mixed-cell or undifferentiated carcinoma.