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TABLE H-3 Weighted Median Serum Ferritin by Body Mass Index (BMI) Quartiles, Adult Reference Sample, NHANES III (1988–1994)

BMI Quartilea

Men

Women

20–49 y Median

50+ y Median

20–49 y Median

50+ y Median

Non-Hispanic White

Quartile 1

118

138

39

77

Quartile 2

132

156

38

89

Quartile 3

132

165

48

92

Quartile 4

168

172

50

101

Regression Results, BMI (adjusted for age)

Beta

4.007

3.619

1.434

2.358

p

0.0001

0.007

0.014

0.0017

Non-Hispanic Black

Quartile 1

129

207

38

125

Quartile 2

143

146

51

120

Quartile 3

166

206

47

124

Quartile 4

186

191

59

150

Regression Results, BMI (adjusted for age)

Beta

2.786

1.885

0.917

0.58

p

0.0048

NSb

0.03

NS

Mexican American

Quartile 1

90

111

30

90

Quartile 2

128

160

34

87

Quartile 3

137

169

40

93

Quartile 4

178

174

65

112

Regression Results, BMI (adjusted for age)

Beta

6.852

–0.6788

3.192

1.372

p

0

NS

0

0.019

NOTE: Excludes individuals with C-reactive protein levels > 1 and values indicative of iron deficiency for transferrin saturation, erythrocyte protoporphyrin, and mean corpuscular volume.

a BMI quartiles were defined using race/ethnicity-, age-, and sex-specific cutoffs.

b NS = not significant.



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