Table 2.
Reproducibility of energy and nutrient intake between FFQ1 and FFQ2 (n = 139)
| Nutrient | FFQ1 | FFQ2 | ICC | Kappa | SCC | ||
|---|---|---|---|---|---|---|---|
| Median | P25, P75 | Median | P25, P75 | 95% CI | |||
| Energy (Kcal) | 2270.1 | 2101.3, 2481.9 | 2283.8 | 2089.8, 2508.1 | 0.78 (0.69, 0.81) | 0.49** | 0.84** |
| Protein (g) | 64.3 | 59.5, 67.1 | 65.3 | 58.1, 71.2 | 0.69 (0.58, 0.78) | 0.33** | 0.74** |
| Fat (g) | 72.5 | 68.1, 75.5 | 70.8 | 66.1, 79.2 | 0.78 (0.70, 0.84) | 0.36** | 0.78** |
| Carbohydrates (g) | 344.5 | 328.6, 357.5 | 337.4 | 311.6, 369.3 | 0.59 (0.46, 0.70) | 0.25** | 0.67** |
| Dietary fiber (g) | 14.0 | 12.5, 15.0 | 13.5 | 10.3, 16.0 | 0.43 (0.27, 0.57) | 0.12* | 0.49** |
| Cholesterol (mg) | 270.8 | 254.1, 292.0 | 263.0 | 240.7, 303.8 | 0.71 (0.63, 0.82) | 0.51** | 0.77** |
| Vitamin A (μg RE) | 544.5 | 465.9, 579.4 | 546.0 | 441.2, 597.4 | 0.77 (0.65, 0.80) | 0.52** | 0.81** |
| Vitamin D (μg) | 10.5 | 8.5, 13.0 | 8.5 | 6.0, 12.3 | 0.51 (0.25, 0.67) | 0.30** | 0.63** |
| Vitamin E (mg) | 13.5 | 11.5, 15.0 | 12.5 | 9.6, 13.8 | 0.45 (0.30, 0.58) | 0.18* | 0.51** |
| Vitamin K (μg) | 67.8 | 60.0, 75.5 | 65.8 | 50.8, 76.9 | 0.69 (0.56, 0.79) | 0.41** | 0.83** |
| Thiamin (mg) | 0.9 | 0.7, 1.1 | 0.7 | 0.5, 1.1 | 0.74 (0.62, 0.82) | 0.24** | 0.68** |
| Riboflavin (mg) | 0.9 | 0.7, 1.2 | 0.8 | 0.7, 1.0 | 0.65 (0.48, 0.77) | 0.37** | 0.71** |
| Vitamin B6 (mg) | 1.1 | 0.8, 1.3 | 1.0 | 0.7, 1.1 | 0.60 (0.45, 0.71) | 0.36** | 0.64** |
| Vitamin B12 (μg) | 1.6 | 1.1, 2.1 | 1.3 | 0.5, 2.2 | 0.71 (0.62, 0.82) | 0.36** | 0.81** |
| Vitamin C (mg) | 81.8 | 73.5, 92.9 | 57.3 | 44.6, 82.6 | 0.43 (-0.07, 0.72) | 0.29** | 0.70** |
| Folate (μg) | 382.5 | 331.5, 425.3 | 379.3 | 296.9, 466.9 | 0.72 (0.62, 0.80) | 0.43** | 0.66** |
| Calcium (mg) | 612.0 | 513.8, 714.4 | 619.5 | 446.3, 724.9 | 0.76 (0.66, 0.83) | 0.64** | 0.81** |
| Phosphorus (mg) | 716.0 | 644.5, 834.5 | 740.3 | 592.3, 882.3 | 0.73 (0.63, 0.80) | 0.40** | 0.82** |
| Potassium (mg) | 1767.8 | 1676.5, 1979.4 | 1612.3 | 1427.9, 1934.9 | 0.71 (0.57, 0.80) | 0.51** | 0.79** |
| Sodium (mg) | 1662.5 | 1528.1, 1832.8 | 1503.8 | 1299.1, 1838.1 | 0.61 (0.54, 0.74) | 0.46** | 0.73** |
| Magnesium (mg) | 289.5 | 276.1, 311.4 | 256.5 | 223.9, 289.4 | 0.39 (0.21, 0.49) | 0.21** | 0.43** |
| Iron (mg) | 12.5 | 10.1, 13.5 | 12.5 | 9.5, 15.3 | 0.61 (0.35, 0.74) | 0.57** | 0.76** |
| Iodine (μg) | 86.0 | 74.0, 105.9 | 82.0 | 57.5, 125.8 | 0.68 (0.57, 0.77) | 0.46** | 0.76** |
| Zinc (mg) | 11.5 | 10.5, 13.5 | 12.5 | 9.5, 15.6 | 0.51 (0.36, 0.63) | 0.35** | 0.65** |
| Selenium (μg) | 58.5 | 53.0, 68.0 | 61.3 | 54.5, 70.8 | 0.48 (0.39, 0.61) | 0.52** | 0.64** |
| Copper (mg) | 1.0 | 0.9, 1.2 | 0.7 | 0.5, 1.2 | 0.43 (0.24, 0.58) | 0.11* | 0.55** |
| Niacinamide (mg) | 273.5 | 260.5, 288.5 | 256.5 | 238.1, 279.3 | 0.63 (0.51, 0.73) | 0.22** | 0.57** |
| Choline (mg) | 430.5 | 364.1, 476.5 | 445.3 | 314.6, 514.1 | 0.57 (0.46, 0.68) | 0.39** | 0.62** |
Daily intakes of nutrients estimated by two FFQs; P25, P75, 25th–75th percentile
ICCs, intra-class correlation coefficients; CI, confidence interval; SCC, Spearman correlation coefficients
Statistical significance was accepted with *P < 0.05 (2-tailed). **P < 0.01