Table 3

Agreement of quartiles for food group intake assessed by the food frequency questionnaire and two 24-hour dietary recalls*

Agreement of quartiles for food group intake (all participants)


Food group

Same quartile%

Adjacent quartile%

Opposite quartile%

Weighted Kappa

95%- Confidence Interval


Coffee

50.3

44.1

0.0

0.54

0.45 - 0.62

Butter and margarine

50.3

40.4

0.6

0.51

0.42 - 0.60

Sweet spreads

48.4

39.0

1.3

0.49

0.40 - 0.59

Milk

45.6

40.3

1.9

0.45

0.35 - 0.55

Non alcoholic beverages

49.0

33.6

3.4

0.45

0.34 - 0.56

Meat products

40.4

44.7

1.9

0.39

0.29 - 0.49

Water

38.4

44.2

2.2

0.36

0.25 - 0.47

Fresh fruits

39.7

37.9

4.9

0.34

0.23 - 0.44

Sweets

40.2

39.0

5.0

0.31

0.20 - 0.43

Bread

38.6

39.9

5.2

0.29

0.18 - 0.41

Raw vegetables

29.8

45.0

10.1

0.18

0.07 - 0.29

Meat

29.4

40.6

10.0

0.15

0.04 - 0.26

Potatoes

30.6

38.2

9.4

0.15

0.04 - 0.26

Cooked vegetables

31.0

37.3

7.0

0.09

-0.03 - 0.20


*Analysis was not performed for food groups with more than 25% of the participants who did not consume this food in the 24-hour dietary recalls.

Haftenberger et al. Nutrition Journal 2010 9:36   doi:10.1186/1475-2891-9-36

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