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Table 4 Comparison of energy and nutrient intakes from dietary records and food frequency questionnaires for Japanese athletes based on joint classification by quintiles

From: Development and validation of a food frequency questionnaire for Japanese athletes (FFQJA)

Nutrient intake Joint classification by quintile (%) Weighted kappa statistics
  Same category Adjacent category ± 2 categories ± 3 categories Kappa statistics 95% confidence interval
Energy 49 30 18 4 0.38 0.22–0.54
Protein 36 43 13 9 0.23 0.07–0.40
Fat 32 43 17 9 0.17 0.01–0.33
Carbohydrate 39 38 18 6 0.25 0.09–0.42
Calcium 43 42 14 3 0.38 0.23–0.52
Iron (Fe) 32 53 9 6 0.27 0.13–0.42
Retinol 49 31 18 3 0.40 0.24–0.56
Vitamin B1 30 35 32 4 0.11 −0.06–0.27
Vitamin B2 43 42 14 3 0.38 0.23–0.52
Vitamin C 36 48 13 4 0.32 0.17–0.46
Dietary fiber 43 42 12 5 0.36 0.21–0.51
  1. n = 78