TABLE 3.
Multivariable Cox proportional hazards model for OST
| Variable | Comparison | Overall survival time | Event‐free survival time | ||
|---|---|---|---|---|---|
| Sig. * | Hazard ratio | Sig. | Hazard ratio | ||
| Treatment group | Group 1 vs 2 | .05 ** | 5.399 | .32 | 1.935 |
| Group 1 vs 3 | .18 | 3.742 | .12 | 4.189 | |
| Sex | All groups | .3 | 2.707 | .5 | 1.827 |
| Severity of clinical signs at the time of irradiation | Mild vs moderate/severe | <.001 *** | 0.093 | <.001 *** | 0.123 |
| Anatomic site | No prostate involvement vs prostate involvement | .02 *** | 0.280 | .33 | 0.622 |
| Lymph node irradiation? | Yes vs no | .91 | 0.933 | .75 | 1.212 |
| Treated with more than one course of IM/IGRT? | Yes vs no | .74 | 1.327 | .45 | 1.680 |
| Age | High vs low | .39 | 0.681 | .16 | 0.547 |
| Body weight | High vs low | .08 ** | 2.610 | .26 | 1.844 |
Abbreviations: IM/IGRT, intensity‐modulated and image‐guided radiotherapy; OST, overall survival time.
Bolded and italicized numbers are for significant prognostic factors and are analogous to the stars listed below.
*
P value for multivariable Cox proportional hazards model.
**
P value less than .1.
***
P value less than .05, and considered statistically significant.