Table 2.
Estimated intake of food groups from DIGIKOST-FFQa and WRb for all participants (N=77).c
| Food group | DIGIKOST-FFQ (g/day), median (P10-P90) | WR (g/day), median (P10-P90) | Difference (g/day), median (P10-P90) | Pvalued | Spearman ρ (95% CI) | Correct quartile (%) | Correct+adjacent quartile (%) | Misclassification 2 quartiles (%) | Gross misclassification (%) |
| Fruits and berries | 189 (81-431) | 157 (41-495) | 31 (–107 to 203) | .02 | 0.64 (0.48-0.76) | 42 | 87 | 12 | 1 |
| Berries | 29 (0-93) | 14 (0-90) | 6.5 (–41 to –86) | .02 | 0.35 (0.13-0.54) | 42 | 71 | 21 | 8 |
| Vegetables | 212 (107-414) | 150 (53-304) | 45 (–120 to 244) | <.001 | 0.24 (0.0-0.45) | 30 | 69 | 21 | 10 |
| Legumes | 14.0 (0-57) | 0 (0-61) | 1.6 (–33 to 37) | .03 | 0.45 (0.25-0.62) | 30 | 84 | 16 | 0 |
| Unsalted nuts | 9 (0-30) | 0 (0-18) | 2.3 (–6 to 26) | <.001 | 0.48 (0.28-0.64) | 50 | 74 | 13 | 13 |
| Whole grains | 77 (34-155) | 39 (11-84) | 43 (–10 to 94) | <.001 | 0.51 (0.32-0.67) | 47 | 81 | 17 | 3 |
| Fish | 60 (18-146) | 43 (0-120) | 22 (–27 to 84) | <.001 | 0.52 (0.33-0.67) | 41 | 80 | 17 | 3 |
| Fatty fish | 28 (10-83) | 28 (0-79) | 10 (–23 to 45) | .002 | 0.61 (0.44-0.74) | 43 | 82 | 18 | 0 |
| Low-fat dairy products | 70 (0-351) | 150 (1-370) | –37 (–228 to 137) | <.001 | 0.65 (0.49-0.77) | 47 | 86 | 12 | 3 |
| High-fat dairy products | 14 (3-131) | 31 (6-72) | –9.4 (–51 to 70) | <.001 | 0.33 (0.11-0.52 | 35 | 73 | 20 | 8 |
| Red meat | 35 (0-105) | 54 (0-145) | –13 (–77 to 35) | .002 | 0.58 (0.40-0.72) | 48 | 84 | 13 | 3 |
| Processed meat | 29 (0-96) | 38 (0-101) | –2.5 (–60 to 40) | .13 | 0.54 (0.35-0.69) | 51 | 82 | 13 | 5 |
| Water | 1100 (300-1737) | 757 (94-1968) | 230 (–737 to 1020) | .01 | 0.43 (0.22-0.59) | 42 | 79 | 17 | 4 |
| Sugar-rich beverages | 0.0 (0-69) | 28 (0-95) | 0.0 (–60 to 57) | .14 | 0.30 (0.08-0.50) | 58 | 82 | 18 | 0 |
| Ethanol | 6 (0-20) | 8 (0-29) | –0.8 (–17 to 5) | .002 | 0.71 (0.57-0.81) | 54 | 88 | 9 | 3 |
| Sugar- and fat-rich foods | 34 (0-114) | 64 (18-148) | –27 (–113 to 29) | <.001 | 0.43 (0.22-0.60) | 40 | 79 | 14 | 7 |
aFFQ: food frequency questionnaire.
bWR: weighed food record.
cFor dietary supplements, n=40 (52%) and n=14 (18%) for DIGIKOST-FFQ and WR, respectively, and Fischer exact test was performed (P<.39).
dWilcoxon signed rank test.