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Table 5 Comparison between biomarker levels and nutrient intakes estimated from the food frequency questionnaire according to quartiles and correlation coefficient between measures

From: Use of a food frequency questionnaire to assess diets of Jamaican adults: validation and correlation with biomarkers

  Levels in quartiles on the basis of FFQ p trend 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
  1. a With the exception of those indicated with ns not significant (p > 0.05), all correlations are significant at p < 0.01.
  2. b Adjusted for age, energy, BMI, current smoking,.