Table 1.

Characteristics of glioma cases diagnosed during 1987–2013 from ACTUR and SEER registries

	ACTUR (N=2,231)		SEER (N4,462)		p-value
	N	%	N	%
Age group					1.00
18–39	940	42.13	1880	42.13
40–54	492	22.05	984	22.05
55–64	424	19.00	848	19.00
65 or older	375	16.81	750	16.81
Sex					1.00
Male	1554	69.65	3108	69.65
Female	677	30.35	1354	30.35
Race					1.00
White	2025	90.77	4050	90.77
Black	140	6.28	280	6.28
Asian or Pacific Islander	54	2.42	108	2.42
Other	12	0.54	24	0.54
Year of diagnosis					1.00
1987–1989	240	10.76	480	10.76
1990–1994	530	23.76	1060	23.76
1995–1999	402	18.02	804	18.02
2000–2004	378	16.94	756	16.94
2005–2009	377	16.90	754	16.90
2010–2013	304	13.63	608	13.63
Histology group					1.00
Glioblastoma	965	43.25	1930	43.25
Non-glioblastoma astrocytomas	782	35.05	1564	35.05
Oligodendroglial tumors	317	14.21	634	14.21
Ependymoma	47	2.11	94	2.11
Other gliomas	120	5.38	240	5.38
Tumor grade					<0.001
Well differentiated, grade1	132	5.92	154	3.45
Moderately differentiated, grade 2	230	10.31	503	11.27
Poorly differentiated, grade 3	191	8.56	326	7.31
Undifferentiated, grade 4	779	34.92	1564	35.05
Unknown	899	40.30	1915	42.92
Tumor location					0.006
Supratentorial	1664	74.59	3163	70.89
Infratentorial	146	6.54	336	7.53
Other locations	421	18.87	963	21.58
Caner-directed surgery					<0.001
No	523	23.44	974	21.83
Yes	1625	72.84	3445	77.21
Unknown or Missing	83	3.72	43	0.96
Radiation					<0.001
No	659	29.54	1336	29.94
Yes	1464	65.62	3012	67.50
Unknown or Missing	108	4.84	114	2.55