Table 4.
Multivariable Analysisa of Patient, Tumor, and Treatment Characteristics and Their Association With Overall Survival
| Covariate | Overall Survivalb | |
|---|---|---|
| Hazard Ratio (95% CI) | P Value | |
| Age at diagnosis, y | ||
| >44 | 4.38 (1.34–14.27) | .01 |
| ≤44 | 1 [Reference] | |
| Lymphovascular space invasion | ||
| Positive | 2.20 (1.19–4.06) | .01 |
| Negative | 1 [Reference] | |
| Depth of invasion | ||
| ≥3 mm | 2.11 (0.99–4.51) | .054 |
| <3 mm | 1 [Reference] | |
| Use of elective neck dissection | ||
| Yes | 0.64 (0.34–1.19) | .16 |
| No | 1 [Reference] | |
a
Backward selection with an a level of removal of .20 was used. The following variables were removed from the model: histological grade, margins, perineural invasion, race, sex, adjuvant therapy, and T-stage.
b
The reference group indicates no survival.