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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      
 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 (32) 16 (18)  
Tumor type (for cases only)      
 Gliomas      
  Glioblastomas 28 (64)    
  Astrocytomas (20)    
  Other gliomasb (11)    
 Other malignant brain tumorsc (5)    
A.Cases (n = 44)Controls (n = 88)χ2
n(%)n(%)P
Gendera      
 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 (32) 16 (18)  
Tumor type (for cases only)      
 Gliomas      
  Glioblastomas 28 (64)    
  Astrocytomas (20)    
  Other gliomasb (11)    
 Other malignant brain tumorsc (5)    
B.CasesControls
MeanSDMeanSDP                  d
Age at blood donationa (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.CasesControls
MeanSDMeanSDP                  d
Age at blood donationa (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    
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.

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