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,.