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Major risk factors
| No. of patients | No. of patients (%) | |
|---|---|---|
| Smoking | ||
| Current or former | 1170 | 76% |
| Never | 300 | 20% |
| Unknown | 67 | 4% |
| Alcohol | ||
| Current or former | 900 | 58% |
| Never | 551 | 36% |
| Unknown | 86 | 6% |
| Oral hygiene | ||
| Good | 420 | 28% |
| Intermediate | 445 | 29% |
| Poor | 176 | 11% |
| Unknown/not available | 496 | 32% |
| Familiar history of malignancies | ||
| Yes | 381 | 25% |
| No | 547 | 36% |
| Unknown | 609 | 39% |
