Table 1. Patient demographics (N = 724, Lung cancer cases).
| Total | Smokers | Non-smokers | P value | |
| N = 724 (%) | n = 428 (%) | n = 296 (%) | ||
| Age (years) | ||||
| Median (Range) | 60 (25-90) | 61 (25-90) | 58 (25-90) | 0.0004 |
| < 40 | 36 (5) | 13 (3) | 23 (7.8) | 0.004 |
| 40-60 | 350 (48.3) | 200 (46.7) | 150 (50.7) | |
| > 60 | 338 (46.7) | 215 (50.2) | 123 (41.6) | |
| Gender | ||||
| Male | 547 (75.6) | 398 (93) | 149 (50.3) | <0.001 |
| Female | 177 (24.4) | 30 (7) | 147 (49.7) | |
| Region of residence in India | ||||
| North | 615 (84.9) | 367 (85.7) | 248 (83.8) | 0.84 |
| East | 87 (12) | 49 (11.4) | 38 (12.8) | |
| Central | 8 (1.1) | 5 (1.2) | 3 (1) | |
| West | 14 (1.9) | 7 (1.6) | 7 (2.4) | |
| Occupational history | ||||
| Business | 68 (9.4) | 45 (10.5) | 23 (7.8) | <0.001 |
| Employed | 182 (25.1) | 109 (25.5) | 73 (24.7) | |
| Farmer | 64 (8.8) | 50 (11.7) | 14 (4.7) | |
| Housewife | 138 (19.1) | 24 (5.6) | 114 (38.5) | |
| Labour | 4 (0.6) | 3 (0.7) | 1 (0.3) | |
| Retired/dependent | 266 (36.7) | 197 (46) | 69 (23.3) | |
| Student | 2 (0.3) | 0 (0) | 2 (0.7) |