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Table 6 Food frequency questionnaires visit 1 and 2: cross-classification analysis of energy intake, nutrient intake and Mediterranean diet score

From: Development and relative validation of a food frequency questionnaire for French-Canadian adolescent and young adult survivors of acute lymphoblastic leukemia

  % Classified into same quartilea % Classified into same ±1 quartilea % Misclassifieda Weighted Kappab
Energy 44.8 41.4 13.8 0.60
Protein 37.9 48.3 13.8 0.57
CHO 48.3 41.4 10.3 0.66
Lipids 44.8 34.5 20.7 0.52
Vitamin A 48.3 27.6 24.1 0.49
Vitamin C 44.8 41.4 13.8 0.46
Vitamin E 51.7 31.0 17.3 0.52
Vitamin D 51.7 37.9 10.4 0.66
Calcium 51.7 34.5 13.8 0.63
Mediterranean diet score 58.6 27.6 13.8 0.68
  1. Values are expressed in percentage, N = 29
  2. aCross-classification analyses were completed to validate agreement between the two FFQs in terms of proportions of participants classified into the same or same ±1 quartile or misclassified
  3. bWeighted kappa was used to measure the agreement between the two FFQs. Analyses were completed on crude values not adjusted for energy intake. CHO: carbohydrates