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Table 6 Median comparison of nutrient intake between two FFQ and average of 24-HDR among participants in Shanghai Diet and Health Study for women

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

Energy and nutrients FFQ1 FFQ2 24-HDR Correlation  
Median 25–75th percentile Median 25–75th percentile Median 25–75th percentile FFQ1 versus FFQ2 24-HDR FFQ2
Energy(kcal) 1509.2 1246.5–1781.6 1523.0 1271.4–1749.7 1419.6 1151.6–1701.7 0.66 0.66
Protein(g) 52.4 41.0–64.1 51.7 42.1–63.6 54.5 42.6–67.7 0.56 0.28
Fat(g) 48.6 36.6–63.8 48.1 35.4–61.9 57.5 45.1–74.6 0.72 0.63
Carbohydrate (g) 215.7 171.4–269.3 218.3 176.9–264.5 162.3 126.6–204.6 0.60 0.32
Protein(% energy) 14.1 12.4–15.9 13.8 12.3–15.8 15.1 13.1–17.3 0.66 0.65
Fat(% energy) 27.6 21.4–34.1 27.4 21.3–34.1 40.2 33.3–47.2 0.67 0.66
Carbohydrate (% energy) 59.5 52.8–65.5 59.1 53.1–66 45.2 38.8–51.3 0.66 0.66
Vitamin A(μg) 307.2 220.0–411.2 308.6 216.8–412.9 352.5 236.5–496.6 0.55 0.51
Carotene(μg) 936.9 678.2–1336.5 947.8 628.6–1288.7 1199.6 704.8–1967.2 0.60 0.55
Retinol(μg) 137.6 86.5–196.6 134.0 82.2–196.2 131.1 81.1–187.9 0.58 0.56
Vitamin D(IU) 12.4 4.1–26.6 6.3 2.5–14.4 0.0 0.00 0.63 0.65
Vitamin E(mg) 19.5 12.8–26.5 18.3 10.8–25.5 21.2 15.2–31.1 0.77 0.68
Vitamin K(μg) 8.1 4.0–12.9 12.5 5.4–21.5 0.0 0.00 0.62 0.63
Thiamine(mg) 0.6 0.5–0.7 0.6 0.5–0.7 0.6 0.4–0.8 0.59 0.28
Riboflavin(mg) 0.7 0.5–1 0.7 0.5–0.9 0.7 0.5–0.9 0.51 0.47
Vitamin B6(mg) 0.0 0.00 0.0 0.00 0.0 0.00 0.59 0.59
Vitamin B12(μg) 0.0 0.00 0.0 0.00 0.0 0.00 0.66 0.65
Niacin(mg) 10.0 8.0–12.3 10.3 8.5–12.8 11.7 9.2–15.1 0.53 0.37
Folate (μg) 10.3 6.6–15.5 11.3 7.2–17.1 2.4 0.1–17.3 0.61 0.57
Biotin(μg) 1.2 0.6–1.8 0.9 0.4–1.5 0.3 0.0–0.8 0.64 0.62
Choline(mg) 8.0 3.0–16.4 4.2 0.7–11.3 0.0 0.0–1.7 0.64 0.63
Vitamin C (mg) 48.3 33.4–64.2 47.9 32.0–64.4 56.8 37.9–82.1 0.58 0.53
Calcium (mg) 376.6 245.3–561.8 366.8 250.2–538.1 374.5 255.7–545.8 0.54 0.49
Phosphorus (mg) 775.1 592.3–958.5 756.2 592.5–944.1 782.4 615.4–952.8 0.52 0.34
Potassium (mg) 1395.7 1028.9–1781.5 1332.5 1017.4–1669.9 1453.4 1075.5–1823.4 0.50 0.47
Sodium (mg) 3299.1 901.5–5089 3180.2 704.5–4843.4 3787.2 2716.7–5064.7 0.71 0.67
Magnesium (mg) 207.5 163.6–257.2 205.5 167.5–252.2 208.6 164.6–265.8 0.51 0.32
Iron (mg) 14.1 11.4–17.7 13.9 11.5–17.1 15.3 12.2–19.5 0.52 0.31
Zinc (mg) 8.2 6.6–9.9 8.2 6.9–10 7.8 6.2–9.5 0.49 0.20
Selenium(μg) 39.1 28.4–49.3 37.3 29.0–50.1 39.7 28.8–52.7 0.60 0.37