Table 2.

Univariate Cox regression analysis of factors affecting overall survival

Variables in the equation	P-value	Hazard ratio	95% confidence interval
Age
<45 vs ≥45 years	0	0.452	0.329–0.621
Sex
Female vs male	0.422	1.135	0.834–1.544
Histology
LGG vs HGG	0.002	1.624	1.187–2.223
KPS
<70 vs ≥70	0.057	1.350	0.991–1.839
Tumor side	0.474
Left vs right vs middle vs other
Functional involvement	0.373
Eloquent vs near-eloquent vs non-eloquent
RDW
<13.95 vs ≥13.95	0.074	1.328	0.973–1.813
NLR
<4 vs ≥4	0.037	1.385	1.020–1.881
Platelet count (×109/L)
<400 vs ≥400	0.167	1.522	0.839–2.759

Abbreviations: LGG, low-grade gliomas; HGG, high-grade gliomas; KPS, Karnofsky performance score; RDW, red cell distribution width; NLR, neutrophil–lymphocyte ratio.