Table 5

Comparison between biomarker levels and nutrient intakes estimated from the food frequency questionnaire according to quartiles and correlation coefficient between measures

Levels in quartiles on the basis of FFQ

ptrend

Correlation of biomarker with dietary intakea

Q1

Q2

Q3

Q4

unadjusted r

adjusted b r


Cholesterol

Intake from FFQ (mg)

95.3 ± 38.9

179.4 ± 19.9

267.5 ± 30.9

468.9 ± 113.8

< 0.0001

Serum cholesterol (μmol/l)

4.46 ± 1.04

4.63 ± 0.96

4.69 ± 1.09

4.93 ± 1.07

0.020

0.19

0.24

Folate

Intake from FFQ (μg)

427 ± 102

643 ± 52

845 ± 63

1123 ± 138

< 0.0001

Whole blood folate (ng/ml)

92.8 ± 132.1

108.0 ± 120.2

63.5 ± 33.4

94.9 ± 148.7

0.628

0.11 ns

0.33

Serum folate (ng/ml)

9.55 ± 5.05

10.95 ± 3.95

11.15 ± 3.74

12.85 ± 5.84

0.009

0.22

0.25


a With the exception of those indicated with ns not significant (p > 0.05), all correlations are significant at p < 0.01.

b Adjusted for age, energy, BMI, current smoking,.

Jackson et al. Nutrition Journal 2011 10:28   doi:10.1186/1475-2891-10-28

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