Table 2

Characteristics of the three supplement user groups: multiple dietary supplement users (Multiple Supp) from Shaklee, and multivitamin/mineral users (Single Supp) and non-users (No Supp) from NHANES 2001–2002.

Characteristic

No Supp n = 602

Single Supp n = 176

Multiple Supp n = 278

P-value*


Sex (% female)

40.5

44.6

57.9

<0.0001

Race (% white)

100

100

98.9

Age, years (mean, SE)

53.7 (0.59)

57.0 (0.99)

63.3 (0.48)

<0.001

BMI, kg/m2 (mean, SE)

29.4 (0.32)

27.9 (0.46)

25.9 (0.31)

<0.001

Education (%)

<0.0001

< High School Graduate

16.8

14.7

1.8

High School Graduate

29.1

30.1

12.2

> High School Graduate

54.2

55.2

86.0

Annual income (%)

<0.0001

< $30,000

19.7

17.3

2.5

$30,000–39,999

16.4

14.4

6.8

$40,000–49,999

18.2

19.9

4.7

$50,000–59,999

6.9

10.2

13.3

$60,000–69,999

6.3

3.3

10.8

≥ $70,000

32.6

34.9

61.9


*Differences among the supplement user groups were evaluated using chi-square methods for categorical variables and one-way analysis of variance for continuous variables. BMI = body mass index.

Block et al. Nutrition Journal 2007 6:30   doi:10.1186/1475-2891-6-30

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