Table 1. The demographic and clinicopathological characteristics of patients.
| Characteristic | Training cohort (n=210) | Validation cohort (n=91) |
|---|---|---|
| Age, year | ||
| <60 | 160 (76.2) | 69 (75.8) |
| ≥60 | 50 (23.8) | 22 (24.2) |
| Gender | ||
| Female | 108 (51.4) | 46 (50.5) |
| Male | 102 (48.6) | 45 (49.5) |
| Smoking history | ||
| No | 181 (86.2) | 77 (84.6) |
| Yes | 29 (13.8) | 14 (15.4) |
| Drinking history | ||
| No | 186 (88.6) | 82 (90.1) |
| Yes | 24 (11.4) | 9 (9.9) |
| Rapid growth | ||
| No | 169 (80.5) | 71 (78.0) |
| Yes | 41 (19.5) | 20 (22.0) |
| Pain | ||
| No | 150 (71.4) | 65 (71.4) |
| Yes | 60 (28.6) | 26 (28.6) |
| Facial palsy | ||
| No | 193 (91.9) | 81 (89.0) |
| Yes | 17 (8.1) | 10 (11.0) |
| Grade | ||
| Low/intermediate | 132 (62.9) | 61 (67.0) |
| High | 78 (37.1) | 30 (33.0) |
| pT stage | ||
| 1/2 | 154 (73.3) | 73 (80.2) |
| 3/4 | 56 (26.7) | 18 (19.8) |
| pN stage | ||
| Negative | 195 (92.9) | 87 (95.6) |
| Positive | 15 (7.1) | 4 (4.4) |
| Neck dissection | ||
| No | 192 (91.4) | 86 (94.5) |
| Yes | 18 (8.6) | 5 (5.5) |
| FN sacrifice | ||
| No | 134 (63.8) | 65 (71.4) |
| Yes | 76 (36.2) | 26 (28.6) |
| Surgery margin | ||
| Negative | 190 (90.5) | 87 (95.6) |
| Positive/close | 20 (9.5) | 4 (4.4) |
Values presented as cases (%). FN, facial nerve.