Table 4. Cox regression model for postoperative survival in the entire cohort of 214 oligodendroglial tumors.

	Multivariate Cox regression
	N/n	Hazard Ratio	0.95 CI	p-value
Age ≥ 40 vs. < 40 years	122/92	1.78	1.20–2.63	0.004*
KPS ≥ 90 vs. < 90	142/72	0.89	0.58–1.35	0.6
Gender: male vs. female	123/91	1.21	0.83–1.77	0.3
WHO grade: II vs. III	124/90	0.84	0.56–1.30	0.4
Surgery: Biopsy vs. resection	44/170	0.87	0.57–1.35	0.5
Frontal tumor location	80/134	0.64	0.43–0.96	0.03*
Absence of neurological deficit or personality change	160/54	0.57	0.36–0.90	0.01*
Molecular tumor status: IDHmut-codel vs. NOS	64/150	0.50	0.31–0.78	0.002*

N/n = number of patients in each category,

*significant, CI = Confidence interval.