Table 6.
Univariate and multivariate competing risk regression analysis for relapse and mortality-free relapse
| Variable | Category | Univariate competing risk regression (95 % CI) | p-value* | Multivariate competing risk regression (95 % 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 | ||
*α = 0.05, significant results in bold using competing risk regression