Table 4 Multivariate Cox Proportional Hazards Survival Analysis of Adjuvant Chemoradiation therapy and Overall Survival
| Â | RR (95% CI) | P-value |
|---|---|---|
Age, yrs | Â | Â |
   < 75 | 1.00 | 0.755 |
   ≥ 75 | 0.93 (0.57 - 1.50) |  |
Gender | Â | Â |
   Female | 1.00 | 0.402 |
   Male | 0.84 (0.56-1.26) |  |
Institution | Â | Â |
   Mayo | 1.00 | 0.222 |
   Hopkins | 1.30 (0.85-1.99) |  |
Tumor Stage | Â | Â |
   T1/T2 | 1.00 | 0.317 |
   T3/T4 | 1.24 (0.81-1.91) |  |
Tumor Size | Â | Â |
   ≤ 3 cm | 1.00 | 0.391 |
   > 3 cm | 1.20 (0.79-1.80) |  |
Node | Â | Â |
   Negative | 1.00 | <0.001 |
   Positive | 4.29 (2.5-7.17) |  |
Histology | Â | Â |
   Grade 1/2 | 1.00 | 0.191 |
   Grade 3 | 1.35 (0.86-2.41) |  |
Adjuvant Treatment | Â | Â |
   Observation | 1.00 | <0.001 |
   Adjuvant CRT* | 0.41 (0.25 - 0.67) |  |