Table III.
Cox regression analysis.
| Variables | χ2 | SE | Exp(B) | 95% confidence interval | p value | |
|---|---|---|---|---|---|---|
| Inferior | Superior | |||||
| Gender | 1.8 | 0.40 | 0.58 | 0.26 | 1.28 | 0.18 |
| Age | 0.1 | 0.37 | 1.15 | 0.55 | 2.38 | 0.7 |
| Primary site | 1.1 | 0.08 | 1.09 | 0.92 | 1.29 | 0.28 |
| Histology | 1.3 | 0.58 | 0.51 | 0.16 | 1.64 | 0.26 |
| T status | 11.6 | 0.21 | 1.98 | 1.31 | 3.01 | 0.001 |
| N status | 15.5 | 0.21 | 2.24 | 1.46 | 3.43 | 0.0001 |
| Clinical stage* | 11.4 | 0.35 | 3 | 1.49 | 6.03 | 0.002 |
| Type of flap | 4.8 | 0.09 | 1.24 | 1.02 | 1.50 | 0.03 |
| Margins | 15.7 | 0.19 | 2.04 | 1.40 | 2.97 | 0.0001 |
| Extracapsular spread | 9.2 | 0.35 | 2.77 | 1.39 | 5.52 | 0.004 |
| Perineural invasion | 1.1 | 0.53 | 0.56 | 0.19 | 1.60 | 0.28 |
| Mandible/Maxilla involvement | 0.4 | 0.35 | 1.26 | 0.63 | 2.51 | 0.5 |
| Recurrence | 23 | 0.39 | 5.35 | 2.48 | 11.54 | 0.00001 |
| Treatment modality | 9.5 | 0.53 | 4.50 | 1.58 | 12.82 | 0.005 |
| Lymph node dissection | 0.4 | 0.53 | 0.68 | 0.24 | 1.96 | 0.48 |
*
According to UICC TNM Sixth Edition.