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Table 2 Mean ± (SD), Intraclass Correlation Coefficients (ICC) and Spearman correlation coefficients for energy and 13 nutrients between two DFFQs (n = 161)

From: Validity and reliability of a dish-based semi-quantitative food frequency questionnaire for assessment of energy and nutrient intake among Iranian adults

Energy and 12 nutrients

FFQ_1 M ± SD

FFQ_2 M ± SD

Spearman’s r

ICC

Energy (kcal/day)

3653.7 ± 1940

3004.8 ± 1094

0.60

0.76

Protein (g/day)

113.6 ± 61

96.3 ± 36.9

0.54

0.68

Fat (g/day)

114.2 ± 66.5

94 ± 37.1

0.60

0.75

Carbohydrate (g/day)

559.8 ± 305.8

458 ± 173.6

0.14

0.23

Dietary fiber (g/day)

30.5 ± 18

26.2 ± 11

0.55

0.74

Cholesterol (mg/day)

332.9 ± 214.4

317.7 ± 163.1

0.56

0.72

Thiamin (mg/day)

3.2 ± 1.9

2.6 ± 1

0.55

0.76

Riboflavin (mg/day)

2.2 ± 1.1

1.8 ± 0.7

0.52

0.71

Vitamin C (mg/day)

357 ± 241.5

327.6 ± 170.7

0.48

0.66

Vitamin E (mg/day)

5.5 ± 7.7

4.1 ± 3

0.42

0.48

Folate (μg/day)

467.2 ± 242

406 ± 162.4

0.51

0.75

Calcium (mg/day)

1250.7 ± 672.9

1051.4 ± 410.3

0.56

0.70

Iron (mg/day)

30.3 ± 18.1

25.4 ± 10.3

0.54

0.69

Zinc (mg/day)

30.5 ± 49

21.7 ± 27.4

0.46

0.42

  1. Adjustment for energy was carried using the residual method