Table 1

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

A.Cases (n = 44)Controls (n = 88)χ2
n(%)n(%)P
Gendera
 Male22(50)44(50)
 Female22(50)44(50)
Education
 ≤12 grades33(75)73(83)0.28
 >12 grades11(25)15(17)
Cigarette smoking at blood donation
 Never21(48)45(51)0.92
 Current14(20)27(31)
 Former9(32)16(18)
Tumor type (for cases only)
 Gliomas
  Glioblastomas28(64)
  Astrocytomas9(20)
  Other gliomasb5(11)
 Other malignant brain tumorsc2(5)
B.CasesControls
MeanSDMeanSDPd
Age at blood donationa (yrs)52.6418.7352.6418.621.00
Age at diagnosis (dx) in yrs61.317.2
Time from blood donation to dx (yrs)8.65.9
  • a These variables were matching factors.

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

  • c Includes one chordoma and one meningeal sarcoma.

  • d P from two-sided t test, unmatched.