Table 3

Prognostic factors for overall survival of all patients in propensity-score matched cohorts after treatment

Covariate	Comparison	Univariate analysis		Multivariate analysis
Covariate	Comparison	χ²	P value	χ²	P value
Age, years	< 65 vs. ≥ 65	2.425	0.028*	1.03	0.14
Sex	Male vs. female	1.828	0.545
RPA	1 vs. 2	3.289	0.005**	2.219	0.01*
KPS	< 80 vs. > 70	0.449	0.012*	0.511	0.457
No of lesions	2 vs. > 2	0.479	0.122
Primary cancer	Lung vs. other	1.14	0.71
	Lung vs. breast	0.695	0.417
Prior WBRT	Yes vs. no	1.227	0.53
Neurologic symptoms	Yes vs. no	1.543	0.27
Extracranial metastasis	Yes vs. no	1.442	0.253
Time to BM, months	< 12 months vs. ≥ 12 months	2.312	0.008**	1.005	0.476

*P < 0.05; **P < 0.01.