Table 3.

Cox multivariate analysis results for unmatched and matched population

Variable	Contrast	Unmatched			Matched
		HR	95%CI	P	HR	95%CI	p
Treatment	SSRT versus SRT	2.15	0.63–7.25	0.21	2.65	0.59–11.97	0.21
Age		1.04	0.98–1.09	0.14	1.00	0.92–1.08	0.94

SSRT Stereotactic salvage radiation therapy, SRT Salvage radiation therapy