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)

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


PUFA = polyunsaturated fatty acid. MUFA = monounsaturated fatty acid.

* Quartile by 24-hour recalls.

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

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