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Table 3 Percentages of subjects classified into the same and opposite quartiles of nutrient intake (FFQ 1 and 24 hour recalls) and weighted Kappa (K w)

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

  Proportion (%) of subjects classified FFQ 1*  
  Agreement in same quartile Misclassification in opposite quartile Kappa (K w)
Total Energy (kcal) 48.5 10.0 0.40
Total Carbohydrate (g) 40.0 8.6 0.33
Protein (g) 32.8 24.3 0.17
Total Fat (g) 42.8 11.4 0.35
   Total Saturated Fat 45.5 8.6 0.38
   Total MUFA 41.4 7.1 0.42
   Total PUFA 40.0 10.0 0.31
Linoleic 42.8 11.4 0.34
Linolenic 34.3 11.4 0.22
Cholesterol (mg) 47.1 7.1 0.43
Calcium (mg) 57.1 8.6 0.51
Iron (g) 51.4 10.0 0.48
Retinol (ug) 28.6 20.0 0.13
Beta-carotene (mg) 44.2 14.2 0.23
Vitamin E (mg) 32.8 23.8 0.15
Folate (g) 58.6 4.3 0.57
Total dietary fiber (g) 44.2 4.3 0.42
Alcohol 70.0 4.3 0.64
  1. PUFA = polyunsaturated fatty acid. MUFA = monounsaturated fatty acid.
  2. * Quartile by 24-hour recalls.