TABLE 2.

PROPENSITY SCORE ANALYSIS: RISK OF DEATH FOR PATIENTS TREATED WITH RADIATION THERAPY ACCORDING TO PROPENSITY SCORE QUINTILE

	Overall Survival		Lung Cancer-specific Survival
Quintile	Hazard Ratio	95% CI	Hazard Ratio	95% CI
1, lowest probability of RT	0.70	0.62–0.79	0.73	0.63–0.84
2	0.72	0.64–0.81	0.71	0.62–0.81
3	0.75	0.66–0.85	0.73	0.64–0.84
4	0.72	0.63–0.81	0.71	0.61–0.81
5, highest probability of RT	0.80	0.70–0.92	0.80	0.69–0.92
Entire sample*	0.74	0.70–0.78	0.73	0.69–0.78

Definition of abbreviations: CI = confidence interval; RT = radiation therapy.

Quintiles represent patients grouped on the basis of propensity scores.

^*The hazard ratio for the entire sample is adjusted for propensity score.