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Table 7 Reproducibility of food frequency questionnaire for intakes from each food group

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

  1st FFQJA (g/day) 2nd FFQJA (g/day) Correlation coefficient
Median (Interquartile range) Median (Interquartile range) Crude (95% CI) Energy-adjusted (95% CI) ICC (95% CI)
Cereals 801.5 (626.9, 952.3) 676.8 (552.8, 855.9) 0.560 (0.265–0.759) 0.595 (0.310–0.782) 0.533 (0.257–0.729)
Potatoes 12.6 (6.3, 22.2) 12.6 (6.3, 19.1) 0.453 (0.135–0.687) 0.447 (0.128–0.682) 0.425 (0.122–0.656)
Sugar 0.0 (0.0, 1.1) 0.0 (0.0, 2.1) 0.859 (0.714–0.933) 0.855 (0.707–0.931) 0.903 (0.819–0.949)
Nuts and seeds 0.0 (0.0, 1.1) 0.0 (0.0, 1.1) 0.405 (0.080–0.652) 0.421 (0.098–0.664) 0.845 (0.719–0.917)
Green and yellow vegetables 48.5 (24.7, 78.0) 57.3 (31.8, 92.7) 0.693 (0.446–0.842) 0.693 (0.446–0.842) 0.826 (0.688–0.907)
Other vegetables 103.1 (56.2, 150.8) 109.2 (61.8, 165.8) 0.546 (0.247–0.750) 0.607 (0.326–0.789) 0.718 (0.517–0.844)
Fruits 143.8 (67.2, 316.4) 170.0 (96.5, 254.3) 0.767 (0.558–0.884) 0.768 (0.560–0.885) 0.583 (0.323–0.761)
Mushrooms 4.2 (2.1, 8.6) 2.1 (2.1, 6.4) 0.508 (0.200–0.725) 0.507 (0.199–0.724) 0.657 (0.427–0.808)
Seaweed 0.4 (0.2, 1.1) 0.4 (0.2, 1.0) 0.341 (0.009–0.605) 0.428 (0.106–0.669) 0.801 (0.647–0.892)
Beans 25.6 (17.0, 44.5) 27.3 (16.8, 43.3) 0.525 (0.221–0.736) 0.524 (0.220–0.735) 0.629 (0.387–0.790)
Fish 37.8 (26.3, 56.5) 39.9 (21.0, 67.8) 0.546 (0.247–0.750) 0.593 (0.308–0.781) 0.505 (0.221–0.710)
Meat 127.5 (99.8, 192.7) 159.5 (106.0, 214.9) 0.500 (0.190–0.719) 0.473 (0.158–0.701) 0.417 (0.112–0.651)
Eggs 42.0 (21.0, 53.5) 32.0 (21.0, 55.9) 0.807 (0.624–0.906) 0.815 (0.637–0.910) 0.750 (0.565–0.863)
Dairy products 177.7 (82.4, 302.8) 133.3 (81.4, 241.3) 0.624 (0.349–0.800) 0.666 (0.407–0.826) 0.673 (0.450–0.817)
Oil 21.2 (13.8, 26.7) 16.8 (10.6, 21.3) 0.546 (0.247–0.750) 0.631 (0.358–0.804) 0.520 (0.239–0.720)
Sweets 54.6 (22.3, 90.6) 47.9 (20.5, 77.2) 0.782 (0.583–0.893) 0.815 (0.637–0.910) 0.664 (0.437–0.812)
Luxury drinks 283.5 (52.5, 536.3) 150.5 (78.8, 459.0) 0.707 (0.466–0.850) 0.587 (0.300–0.777) 0.664 (0.437–0.812)
Seasonings 29.0 (20.0, 45.5) 28.0 (16.8, 42.6) 0.669 (0.411–0.828) 0.729 (0.499–0.863) 0.692 (0.478–0.829)
  1. n = 36
  2. FFQJA Food frequency questionnaire for Japanese athletes
  3. Crude correlation coefficient: Spearman’s correlation coefficients
  4. Energy-adjusted correlation coefficients were calculated using an energy density method
  5. ICC Intraclass correlation coefficients
  6. 95% CI: 95% confidence interval