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
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 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.

Tedeschi-Blok et al. BMC Cancer 2006 6:148   doi:10.1186/1471-2407-6-148