American Association for Cancer Research

Table 1

Select characteristics of brain tumor cases and controls, Washington County, MD, 1975–2000

A.	Cases (n = 44)			Controls (n = 88)
A.		n	(%)	n	(%)	P
Gender^a
Male	22	(50)	44	(50)
Female	22	(50)	44	(50)
Education
≤12 grades	33	(75)	73	(83)	0.28
>12 grades	11	(25)	15	(17)
Cigarette smoking at blood donation
Never	21	(48)	45	(51)	0.92
Current	14	(20)	27	(31)
Former	9	(32)	16	(18)
Tumor type (for cases only)
Gliomas
Glioblastomas	28	(64)
Astrocytomas	9	(20)
Other gliomas^b	5	(11)
Other malignant brain tumors^c	2	(5)

A.	Cases (n = 44)			Controls (n = 88)
A.		n	(%)	n	(%)	P
Gender^a
Male	22	(50)	44	(50)
Female	22	(50)	44	(50)
Education
≤12 grades	33	(75)	73	(83)	0.28
>12 grades	11	(25)	15	(17)
Cigarette smoking at blood donation
Never	21	(48)	45	(51)	0.92
Current	14	(20)	27	(31)
Former	9	(32)	16	(18)
Tumor type (for cases only)
Gliomas
Glioblastomas	28	(64)
Astrocytomas	9	(20)
Other gliomas^b	5	(11)
Other malignant brain tumors^c	2	(5)

B.	Cases			Controls
B.		Mean	SD	Mean	SD	P ^d
Age at blood donation^a (yrs)	52.64	18.73	52.64	18.62	1.00
Age at diagnosis (dx) in yrs	61.3	17.2
Time from blood donation to dx (yrs)	8.6	5.9

B.	Cases			Controls
B.		Mean	SD	Mean	SD	P ^d
Age at blood donation^a (yrs)	52.64	18.73	52.64	18.62	1.00
Age at diagnosis (dx) in yrs	61.3	17.2
Time from blood donation to dx (yrs)	8.6	5.9

These variables were matching factors.

Includes one each of the following: oligodendroglioma, brainstem glioma, gliosarcoma, gemistocytic astrocytoma, and ependymoma.

Includes one chordoma and one meningeal sarcoma.

P from two-sided t test, unmatched.