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Table 3 Validation of energy and nutrients intakes between FFQs and 24HRs (n = 139)

From: Reliability and validity of a semi-quantitative food frequency questionnaire: dietary intake assessment among multi-ethnic populations in Northwest China

Nutrient

FFQs

24HRs

Pearson correlation coefficients

Median

P25, P75

Median

P25, P75

unadjusted †

Energy adjusted‡

Energy (Kcal)

2273.5

2100.7, 2505.3

2195.2

2034.3, 2277.1

0.79**

 

Protein (g)

64.5

60.0, 69.5

63.1

59.3, 67.2

0.57**

0.56**

Fat (g)

72.2

67.1, 77.3

72.9

68.1, 76.4

0.71**

0.68**

Carbohydrates (g)

340.5

321.3, 365.4

346.5

325.3, 365.2

0.43**

0.38**

Dietary fiber (g)

14.2

11.3, 15.3

14.0

11.2, 16.3

0.26**

0.26**

Cholesterol (mg)

265.5

250.3, 297.5

278.2

257.0, 298.8

0.77**

0.75**

Vitamin A (μg RE)

544.2

456.5, 587.8

551.0

468.3, 577.5

0.61**

0.58**

Vitamin D (μg)

11.5

9.3, 13.6

11.4

9.2, 14.5

0.77**

0.65**

Vitamin E (mg)

13.4

11.5, 15.6

14.2

11.3, 16.7

0.32**

0.28**

Vitamin K (μg)

67.3

55.2, 77.3

68.2

64.9, 77.8

0.60**

0.55**

Thiamin (mg)

0.8

0.6, 1.1

1.1

0.7, 1.3

0.75**

0.76**

Riboflavin (mg)

0.9

0.7, 1.2

0.9

0.7, 1.2

0.75**

0.77**

Vitamin B6 (mg)

1.0

0.7, 1.2

1.2

0.8, 1.4

0.73**

0.76**

Vitamin B12 (μg)

1.3

0.7, 2.1

1.7

1.2, 2.2

0.66**

0.63**

Vitamin C (mg)

67.5

58.3, 87.2

95.4

84.9, 104.2

0.48**

0.49**

Folate (μg)

384.8

331.8, 442.8

386.5

334.8, 457.5

0.57**

0.52**

Calcium (mg)

598.5

491.3, 709.6

629.6

520.3, 705.3

0.64**

0.63**

Phosphorus (mg)

729.5

610.3, 867.8

717.8

639.5, 799.5

0.61**

0.60**

Potassium (mg)

1681.5

1567.3, 1983.8

1876.3

1786.5, 1995.5

0.63**

0.61**

Sodium (mg)

1564.2

1474.8, 1849.8

1763.5

1645.5, 1894.3

0.61*

0.61*

Magnesium (mg)

273.4

255.8, 296.1

309.5

286.3, 336.8

0.21*

0.21*

Iron (mg)

13.2

10.2, 14.7

12.5

9.0, 15.3

0.12

0.12

Iodine (μg)

86.8

66.3, 113.2

87.3

77.4, 97.8

0.49*

0.47*

Zinc (mg)

12.3

10.3, 14.4

11.5

10.3, 14.2

0.22*

0.22*

Selenium (μg)

59.3

54.7, 69.8

58.3

53.5, 68.4

0.62**

0.61**

Copper (mg)

0.8

0.6, 1.2

1.1

0.9, 1.3

0.15

0.14

Niacinamide (mg)

267.4

251.2, 280.5

281.5

263.3, 295.3

0.42**

0.41**

Choline (mg)

445.2

337.5, 493.5

432.6

366.3, 466.2

0.55**

0.53**

  1. Daily intakes of nutrients estimated by FFQs and 24HRs; P25, P75, 25th–75th percentile
  2. †Based on log-transformed values
  3. ‡Energy adjusted using the residual method
  4. Statistical significance was accepted with *P < 0.05, **P < 0.01