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Table 4 Spearman correlation and percentage agreement in quartile distribution of nutrient intake between second FFQ with average 24-HDR, among participants in Shanghai Diet and Health Study

From: Validity and reliability of a food frequency questionnaire for assessing dietary intake among Shanghai residents

Energy and nutrients Correlation ICC Percentage agreement
Same quartile Adjacent quartile One quartile apart Opposite quartile
Energy(kcal) 0.77 0.51 35.4 43.7 17.5 3.5
Protein(g) 0.45 0.64 38.7 41.6 17.7 2.1
Fat(g) 0.61 0.50 27.4 41.4 22.9 8.3
Carbohydrate (g) 0.39 0.46 35.1 41.7 19 4.2
Protein(% energy) 0.76 0.50 30.2 41.5 20.3 8
Fat(% energy) 0.76 0.54 25.3 39.5 24.3 10.9
Carbohydrate (% energy) 0.77 0.66 26.3 40.1 22.8 10.8
Vitamin A(μg) 0.66 0.40 33 39.2 20.8 7.1
Carotene(μg) 0.67 0.46 30.2 39.2 23.6 7.1
Retinol(μg) 0.7 0.53 33.6 40.6 19.7 6.1
Vitamin D(IU) 0.76 0.47 18.2 72.7   9.1
Vitamin E(mg) 0.74 0.53 33.1 38.3 20.1 8.5
Vitamin K(μg) 0.73 0.36 33.6 31.1 27.7 7.6
Thiamine(mg) 0.35 0.47 35.7 42.8 16.1 5.4
Riboflavin(mg) 0.63 0.50 41.3 41 15.4 2.3
Niacin(mg) 0.4 0.46 34.9 42.7 17.9 4.6
Folate (μg) 0.7 0.60 26.5 38 24.7 10.9
Biotin(μg) 0.75 0.63 24.8 37.9 24.3 13
Choline(mg) 0.77 0.41 24.9 40.3 21.6 13.3
Vitamin C (mg) 0.67 0.61 33.7 38.7 21.1 6.5
Calcium (mg) 0.68 0.62 40.6 40.7 15.9 2.8
Phosphorus (mg) 0.51 0.58 41.6 40.9 14.6 2.9
Potassium (mg) 0.62 0.51 39.4 41.7 15.7 3.2
Sodium (mg) 0.76 0.61 27.4 39.3 23.8 9.6
Magnesium (mg) 0.48 0.53 34 42 19.1 4.9
Iron (mg) 0.42 0.41 34.9 41.3 18.5 5.3
Zinc (mg) 0.33 0.61 36.8 39.1 19.8 4.2
Selenium(μg) 0.57 0.65 40.8 40 15.9 3.3