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Demographic characteristics in the cases and controls
| Variables | Cases (n = 317) (%) | Controls (n = 268) (%) | P | |
|---|---|---|---|---|
| Sex | Male | 242 (76.3) | 199 (74.3) | |
| Female | 75 (23.7) | 69 (25.7) | ||
| Age (Mean age ± SD) | 63.35 ± 12.95 | 64.13 ± 12.38 | 0.443 | |
| Smoking | Non smokers | 168 (53.0) | ||
| Smokers | 149 (47.0) | |||
| Grade* | I | 43 (13.6) | ||
| II | 108 (34.1) | |||
| III | 155 (48.9) | |||
| Mixed* | 11 (3.4) | |||
| Stage | Superficial | 138 (43.5) | ||
| Invasive | 179 (56.5) | |||
| Event | Recurrence/non recurrence | 71/54 | ||
| Death/live | 38/87 |
