Table 2. The distribution of variable between grade I–II and grade III–IV tumors.

Variable	N/%	N/%	P-valuea
	Grade I-II	Grade III-IV
Gender			0.412
Male	157/53.4	107/57.2
Female	137/46.6	80/42.8
Age			0.001*
Mean(range)/year	38.63(1-81)	44.81 (2-79)
<40	144/49	64/34.2
≥40	150/51	123/65.8
Surgery			0.706
GTR	197/67	131/70.1
NTR+STR	97/33	56/29.9
Radiotherapy			0.562
GK	197/67	118/63.1
CRT	73/24.8	4926.2
No	24/8.2	2010.7
Chemotherapy			0.637
Yes	124/42.2	74/39.6
No	170/57.8	113/60.4
Total	294	187
			P-value b
OS			0.039*
Median, months	12	10
Survival	17/5.8	9/4.8
Loss to follow-up	14/4.8	3/1.6
Death	263/89.5	175/93.6
OS rate, % 1 year	33	39
2 years	11.5	8.5
3 years	9	5.5
PFS			0.12
Median, months	8	8
Progression-free	17/5.8	7/3.7
Progression	275/93.5	178/95.2
Total	292/99.3	185/98.9
Missing System	2/0.7	2/1.1
PFS rate, % 1 year	17.1	13.5
2 years	7.9	6.5
3 years	5.4	3.7

Notes:

^aP-values based on Pearson χ² test;

^bP-values based on log-rank test;

^*p-value < 0.05 indicates statistical significance.

Abbreviations: GTR: gross-total resection; NTR: near-total resection; STR: sub-total resection; GK: Gamma Knife; CRT: Conformal Radiotherapy; OS: Overall Survival; PFS: Progression-free Survival.