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Table 3 Agreement of quartiles for food group intake assessed by the food frequency questionnaire and two 24-hour dietary recalls*

From: Relative validation of a food frequency questionnaire for national health and nutrition monitoring

  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
  1. *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.