Table 2. Univariable Analysis of Risk Factors for Disease-Free Survival.
| Variable | Disease-Free Survival HR (95% CI) |
|---|---|
| Age <47.1 vs ≥47.1 y | 0.01 (0.01-20.08) |
| Extent of resection superficial vs total parotidectomy | 1.88 (0.34-10.88) |
| Neck dissection | 4.97 (0.77-32.72) |
| Pathological T category T1-2 vs T3-4a | 0.19 (0.03-1.20) |
| Pathological N category N0/Nx vs N+ | 0.36 (0.11-1.20) |
| Tumor size <2.1 vs ≥2.1 cm | 0.15 (0.02-1.25) |
| Final margin positive | 3.72 (0.62-22.31) |
| No high-risk histopathologic factorsa | 0.08 (0.01-0.71) |
| Adjuvant radiotherapy | 2.47 (0.45-13.65) |
Abbreviation: HR, hazard ratio.
a
High-risk histopathologic factors include T3-4a, N+, lymphovascular or perineural invasion, high-grade, or positive margins.