Table 4.

Multivariate analysis of survival (Cox proportional hazards model)

	Risk ratio	95%- confidence interval	p
Age
(≤65vs.>65 years)	1.14	0.83 – 1.58	0.42
ECOG performance score
(2vs.3–4)	2.12	1.40 – 3.29	<0.001
Ambulatory status prior to RT
(ambulatoryvs.ot ambulatory)	1.98	1.40 – 2.81	<0.001
Other bone metastases
(novs.yes)	1.38	0.98 – 1.95	0.07
Visceral metastases
(novs.yes)	2.74	1.93 – 3.91	<0.001
Time developing motor deficits
(>7vs.1–7 days	1.27	1.07 – 1.51	0.007