Table 2. Study group summary.

	N	M/F	Mean age
Astrocytic tumors	80	31/39	49.1
– Astrocytoma	31	12/19	42.3
– Anaplastic astrocytoma	49	29/20	53.5
Oligoastrocytic tumors	54	32/22	42.3
– Oligoastrocytoma	26	12/14	37.4
– Anaplastic oligoastrocytoma	28	20/8	46.6
Oligodendroglial tumors	31	11/20	43.1
– Oligodendroglioma	18	7/11	40.7
– Anaplastic oligodendroglioma	13	4/9	46.4