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Table 1 Distribution of vitamin supplement intake, age, gender, ethnicity, income, education, body mass index and tumor type for eligible participants for combined series I & II; San Francisco Bay Area Adult Glioma Study, 1991–2000

From: Inverse association of antioxidant and phytoestrogen nutrient intake with adult glioma in the San Francisco Bay Area: a case-control study

Description   Cases1
  Controls (N = 846) All (N = 802) Self-reported (N = 497) Proxy-reported (N = 305)
Vitamin Supplement intake (% YES) 62.6 52.4 *** 50.2 *** 56.0 *
General Demographics        
   Age (median) ± SE2 55.1 ± 0.6 55.4 ± 0.6 ns 49.7 ± 0.7 *** 64.7 ± 0.8 ***
   Gender as % Male 54.5 57.1 ns 58.6 ns 54.8 ns
   Ethnicity as % White3 83.8 83.3 ns 83.9 ns 82.3 ns
Socio-economic Status Measures (%)        
   Household Income4        
<$29,999 25.0 24.3 ns 17.4 *** 36.0 ***
$30,000–$69,999 40.8 39.8   38.5   42.1  
≥$70,000 34.1 35.9   44.1   21.9  
   Highest Education        
Less than high school 6.0 10.1 ** 4.8 ns 18.7 ***
High school, some college 48.5 48.9   47.5   51.2  
College graduate and/or more 45.5 41.0   47.7   30.2  
Socio-economic Status5        
   <High School education or income <$29,999 27.3 27.7 ns 19.1 *** 41.6 ***
   ≥High School graduate or income $30,000–$69,999 53.2 50.4   52.7   46.6  
   College graduate and income ≥ $70,000 19.5 22.0   28.2   11.8  
Body Mass Index6 (median) ± SE2 25.7 ± 0.2 25.9 ± 0.2 ns 25.7 ± 0.2 ns 26.2 ± 0.3 ns
   Tumors Types (%)        
Glioblastoma   59.2   47.7   78.0  
Anaplastic Astrocytoma   11.2   10.7   12.1  
Astrocytoma   5.4   7.2   2.3  
Oligodendroglioma   11.1   16.5   2.3  
Oligoastrocytoma   6.2   8.5   2.6  
Ependymoma   1.0   1.4   0.3  
Other   5.9   8.1   2.3  
  1. 1 p-values for case-control comparisons (t-tests for continuous variables or chi-square tests for categorical variables): * p = 0.05, **p = 0.01, ***p = 0.001, or not significant (ns). 2 SE = standard error. 3 The category other than white includes African-Americans, Chinese, Japanese, other Asians, Filipinos, Mexicans, other Latinos, and others. 4 Percentages do not total 100% due to "Refuse to Answer" and "Don't Know". 5 Categories for Socio-economic Status combine highest education attained and/or household income range. 6 BMI calculated from reported height and weight at interview.