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Patient characteristics.
| Variables | Precancer (N = 37) | OSCC (N = 124) | Recurrence (N = 21) |
|---|---|---|---|
| Age | |||
| <50 years | 6 | 26 | 3 |
| > = 50 years | 31 | 98 | 18 |
| Sex | |||
| Male | 28 | 103 | 17 |
| Female | 9 | 21 | 4 |
| Occupation | |||
| Unemployed | 26 | 81 | 16 |
| Employed | 11 | 43 | 5 |
| Marital status | |||
| Unmarried | 3 | 11 | 1 |
| Married | 34 | 113 | 20 |
| Education level | |||
| None | 3 | 9 | 2 |
| Elementary | 5 | 25 | 7 |
| Junior high | 14 | 36 | 4 |
| Senior high | 13 | 43 | 7 |
| College and above | 2 | 11 | 1 |
| Lifestyle habits | |||
| Smoking | 29 | 89 | 15 |
| Alcohol | 16 | 62 | 7 |
| Betel nut | 13 | 33 | 5 |
