Table 4.

Multivariable Cox proportional hazards models with propensity score for overall survival in patients receiving definitive chemoradiotherapy for rectal cancer

Significant characteristic	Hazard of death (95% CI), Cox model with propensity score	p
Distance to facility, miles
≤8.5	Reference
>8.5	0.85 (0.81–0.0.93)	<0.0001
Radiation, Gy
≤54	Reference
>54	1.48 (1.35–1.62)	<0.0001
Income, US $
<30,000	Reference
30,000–35,000	0.94 (0.84–1.04)	0.22
35,000–45,999	0.88 (0.78–0.98)	0.0246
>46,000	0.82 (0.76–0.89)	<0.0001
Location
Metro	Reference
Urban	1.22 (1.11–1.34)	0.0001
Rural	1.50 (1.35–1.62)	0.0001