Table 1.

Patient characteristics.

		N	%
Number of patients		272	(100)
Gender	female:male	1:1.1
Age	median (range)	71 years (65–88)
Preoperative KPS
	100%	9	(3)
	90%	52	(19)
	80%	74	(27)
	70%	44	(16)
	≤60%	93	(35)
Number of surgeries per patient
	1 surgery	244	(90)
	2 surgeries	25	(9)
	≥3 surgeries	3	(1)
Histology	glioblastoma	269	(99)
	gliosarcoma	3	(1)
Charlson Comorbidity Index
	2	33	(12)
	3	45	(16)
	4	56	(20)
	5	57	(20)
	6	53	(19)
	>7	28	(10)
Karnofsky performance status (KPS)