Variable | Cases (n = 516) n (%) | Controls (n = 533) n (%) | P a |
---|---|---|---|
Gender | Â | Â | Â |
   Male | 456 (88.4) | 460 (86.3) |  |
   Female | 60 (11.6) | 73 (13.7) | 0.314 |
Age (yrs), mean (SD) | 64.79 (10.99) | 63.54 (11.33) | 0.090 |
Smoking Status | Â | Â | Â |
   Never | 1 (0.2) | 4 (0.7) |  |
   ETS exposed | 35 (6.8) | 141 (26.45) |  |
   Ever | 480 (93.0) | 388 (73.0) | < 0.001 |
Former | 222 (46.8) | 224 (60.1) | Â |
Current | 252 (53.2) | 149 (39.9) | < 0.001 |
Type of tobacco | Â | Â | Â |
   Only black | 359 (75.3) | 223 (60.6) |  |
   Only blond | 47 (9.8) | 84 (22.8) |  |
   Both | 71 (14.9) | 61 (16.6) | < 0.001 |
Pack-yearsb, mean (SD) | 62.85 (36.18) | 40.41 (38.95) | < 0.001 |
Family history of cancer | Â | Â | Â |
   No | 272 (57.3) | 317 (62.2) |  |
   Lung cancer | 57 (12.0) | 35 (6.9) |  |
   Other cancer | 146 (30.7) | 158 (31.0) | 0.019 |
Histological type | Â | Â | Â |
   Squamous cell carcinoma | 208 (40.3) |  |  |
   Adenocarcinoma | 152 (29.5) |  |  |
   Small cell carcinoma | 83 (16.1) |  |  |
   Large cell carcinoma | 16 (3.1) |  |  |
   Non-differentiated | 39 (7.6) |  |  |
   Others | 7 (1.3) |  |  |
   Clinical diagnosis | 2 (0.4) |  |  |
   Missing | 9 (1.7) |  |  |