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Table 3 Spearman correlation, ICC and percentage agreement in quartile distribution of nutrient intake between the two FFQs, 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) 0.71 0.59 36.8 41.5 19.1 2.6
Protein(g) 0.56 0.71 37.5 42.3 16.2 4
Fat(g) 0.69 0.48 30.6 40.8 21 7.6
Carbohydrate (g) 0.62 0.47 35.3 41.1 18.6 5
Protein(% energy) 0.72 0.55 31.9 38.3 22.8 7
Fat(% energy) 0.71 0.58 28.7 39.7 21.3 10.4
Carbohydrate (% energy) 0.71 0.55 28.2 39.2 22.8 9.8
Vitamin A(μg) 0.56 0.38 34 39.8 20 6.2
Carotene(μg) 0.58 0.51 34.1 39.5 20.1 6.3
Retinol(μg) 0.64 0.40 32.7 41.2 19.3 6.8
Vitamin D(IU) 0.69 0.56 13.3 53.3 26.7 6.7
Vitamin E(mg) 0.79 0.37 35.3 37.8 19.8 7.1
Vitamin K(μg) 0.66 0.40 27.3 33.8 27.7 11.3
Thiamine(mg) 0.57 0.54 33 42 19.5 5.5
Riboflavin(mg) 0.59 0.59 40 42.1 13.4 4.6
Niacin(mg) 0.46 0.45 34.6 40.1 19.6 5.7
Folate (μg) 0.63 0.68 25.3 38 26.7 10
Biotin(μg) 0.68 0.69 25.2 35.4 27.2 12.3
Choline(mg) 0.69 0.37 23.2 37.6 26 13.3
Vitamin C (mg) 0.56 0.45 34 42.4 18.5 5.1
Calcium (mg) 0.62 0.72 39.9 41.5 14.7 4
Phosphorus (mg) 0.61 0.34 39.4 41.7 14.6 4.3
Potassium (mg) 0.55 0.51 36.9 42.1 17 4.1
Sodium (mg) 0.74 0.58 29.4 42.8 20.1 7.7
Magnesium (mg) 0.53 0.53 36.8 40.8 17.2 5.2
Iron (mg) 0.49 0.45 35.4 44.3 15.8 4.6
Zinc (mg) 0.49 0.61 33.9 40.2 21.1 4.8
Selenium(μg) 0.6 0.70 39.1 39.7 17 4.2