Table 3.
Characteristics of lung cancer cases and control patients in a Spanish population
| Variable | Cases (n = 516) n (%) | Controls (n = 533) n (%) | Pa |
| Gender | |||
| 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 | |||
| 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) | |
| Current | 252 (53.2) | 149 (39.9) | < 0.001 |
| Type of tobacco | |||
| 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 | |||
| 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 | |||
| 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) |
a Two-sided χ2 test and Mann-Whitney where appropriate
b Pack-years for ever smokers