Table 1.

Clinical characteristics

	Low grade group	High grade group	p
Sex（Male: Female）	17:77	44:50	0.0000259
Age（years）	54.16 ± 10.10	56.28 ± 12.56	0.207
Size（cm）	3.315 ± 1.450	5.016 ± 1.716	9.97E-12
Indistinct margins(present/absent)	3/91	19/75	0.000283
Surrounding invasion(present/absent)	8/86	33/61	0.0000100
Dural tail(present/absent)	76/18	58/36	0.00372
Peritumoral edema(present/absent)	36/58	68/26	2.67E-06