Table I.
Characteristics of OSCC cases and controls in the South African Black and Mixed Ancestry populations
| Black population | Mixed Ancestry population | ||||
|---|---|---|---|---|---|
| Cases | Controls | Cases | Controls | ||
| n | 407 | 849 | 257 | 860 | |
| *Age, mean years (SD) | 59.8 (11.3) | 48.8 (16.7) | 60.6 (10.6) | 46.7 (16.8) | |
| *Sex, n (%) | Male | 199 (48.9%) | 335 (39.5%) | 165 (64.2%) | 309 (35.9%) |
| Female | 208 (51.1%) | 511 (60.2%) | 91 (35.4%) | 551 (64.1%) | |
| Unknown | 0 (0.0%) | 3 (0.4%) | 1 (0.4%) | 0 (0.0%) | |
| *Smoking status, n (%) | Ever-smoker | 242 (59.5%) | 333 (39.2%) | 240 (93.4%) | 597 (69.4%) |
| Never-smoker | 164 (40.3%) | 505 (59.5%) | 15 (5.8%) | 258 (30.0%) | |
| Unknown | 1 (0.2%) | 11 (1.3%) | 2 (0.8%) | 5 (0.6%) | |
| *Alcohol consumption, n (%) | Drinker | 253 (62.2%) | 452 (53.2%) | 212 (82.5%) | 419 (48.7%) |
| Non-drinker | 151 (37.1%) | 393 (46.3%) | 45 (17.5%) | 436 (50.7%) | |
| Unknown | 3 (0.7%) | 4 (0.5%) | 0 (0.0%) | 5 (0.6%) | |
*Age, sex, smoking status and alcohol consumption were significantly different between cases and controls in both populations (P < 0.01).