| Variable | NSCLC patients (%) | Healthy controls (%) |
| Total No. | 160 | 160 |
| Race | North Indians | North Indians |
| Gender | ||
| Males | 124 (77.5) | 124 (77.5) |
| Females | 36 (22.5) | 36 (22.5) |
| Age at diagnosis (years ) | ||
| ≤45 Y | 32 (20.0) | 32 (20.0) |
| >45 Y | 128 (80.0) | 128 (80.0) |
| Mean ± SD age (Y) | 57.32 ± 11.9 (range, 30 - 85 years) | 56.02 ± 10.6 (range, 32 - 80 years) |
| Smoking status | ||
| Non smoker | 47 (29.4) | 47 (29.4) |
| Smokers | 113 (70.6) | 113 (70.6) |
| Current smokers | 48 (42.5) | 48 (42.5) |
| Ex-smokers | 65 (57.5) | 65 (57.5) |
| Smoking level (pack year) | ||
| Mild (≤10) | 18 (15.9) | 18 (15.9) |
| Moderate (≤40) | 49 (43.4) | 49 (43.4) |
| Heavy (>40) | 46 (40.7) | 46 (40.7) |
| Smoking type |
|
|
| Cigarette | 33 (29.2) | 33 (29.2) |
| Bidi | 16 (14.2) | 16 (14.2) |
| Huka | 27 (23.9) | 27 (23.9) |
| Cigarette + Bidi | 15 (13.3) | 15 (13.3) |
| Cigarette + Huka | 22 (19.5) | 22 (19.5) |
| Histological type | ||
| Squamous cell carcinoma | 79 (49.4) |
|
| Adenocarcinoma | 81 (50.6) |
|
| TNM stage | ||
| Early (I & II) | 60 (37.5) |
|
| Advanced (III & IV) | 100 (62.5) |
|
| Distant metastases | ||
| Positive | 42 (26.2) |
|
| Negative | 118 (73.8) |
|
| Histological grades |
|
|
| Squamous cell carcinoma grades | ||
| Grade 1 | 43 (54.4) |
|
| Grade 2 | 22 (27.8) |
|
| Grade 3 | 14 (17.7) |
|
| Adenocarcinoma grade | ||
| Grade 1 | 14 (17.3) |
|
| Grade 2 | 23 (27.2) |
|
| Grade 3 | 45 (55.5) |
|
| Family history of any cancer | ||
| Significant | 19 (11.9) |
|
| Non significant | 141 (88.1) |
|