Table 2.

Multifactor analysis affecting patients' OS and PFS.

Factor	Regression coefficient	x 2 value	P value	RR value	95% CI
RPA rating (OS)	−2.019	9.487	0.002	0.133	0.037–0.48
MMSE score (PFS) before radiotherapy	−2.337	11.019	0.01	0.097	0.024–0.384