Table 6 Univariate and multivariate competing risk regression analysis for relapse and mortality-free relapse
Variable | Category | Univariate competing risk regression (95Â % CI) | p-value* | Multivariate competing risk regression (95Â % CI) | p-value* |
|---|---|---|---|---|---|
Relapse | |||||
Primary site | Non-oropharyngeal vs Oropharyngeal | 2.119 (1.282–3.501) | 0.0034 | 1.899 (0.998–3.611) | 0.0505 |
COPD | Yes vs. No |  |  | 1.298 (0.777–2.170) | 0.3194 |
Prior Cancer | Yes vs. No |  |  | 1.083 (0.644–1.819) | 0.7645 |
Primary Treatment | Surgery vs. Chemotherapy/ Radiation |  |  | 1.306 (0.734–2.323) | 0.3645 |
Stage | Stage 4 vs Other |  |  | 1.506 (0.930–2.438) | 0.0.0960 |
Age | Age ≥ 55 vs <55 |  |  | 0.960 (0.587–1.571) | 0.8714 |
Mortality-free Relapse | |||||
Primary site | Non-oropharyngeal vs Oropharyngeal | 0.636 (0.314–1.288) | 0.053 | 0.896 (0.366–2.194) | 0.8098 |
COPD | Yes vs. No |  |  | 1.669 (0.734–3.794) | 0.2218 |
Prior Cancer | Yes vs. No |  |  | 2.507 (1.118–5.624) | 0.0258 |
Primary Treatment | Surgery vs. Chemotherapy/ Radiation |  |  | 0.319 (0.115–.884) | 0.0280 |
Stage | Stage 4 vs Other |  |  | 2.242 (1.084–4.638) | 0.0295 |
Age | Age ≥ 55 vs <55 |  |  | 2.975 (0.925-9.568) | 0.0673 |