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Table 2 Agreement analysis by cross-classification into quartiles of dietary energy and nutrients derived from two 24-h diet recall and the culture-specific food frequency questionnaire among pastoralist (N = 130)

From: Design and validation of a food frequency questionnaire to assess the dietary intake for adults in pastoral settings in Northern Tanzania

Energy and nutrients

Classified into same quartile (%)

Classified into same or adjacent quartile (%)

Classified into opposite quartile (%)

Weighted Kappa (k)

Energy (kcal/d)

37.7

75.4

5.4

0.34***

Macronutrients

 Carbohydrates (g/d)

34.6

76.1

5.3

0.34***

 Fat (g/d)

29.2

73.1

9.2

0.20*

 Protein (g/d)

31.5

70.0

9.2

0.18*

 Cholesterol (g/d)

20.7

57.7

14.6

− 0.09

 Fiber (g/d)

33.8

75.4

7.7

0.28**

Micronutrients

 Calcium (mg/d)

20.7

62.3

13.8

− 0.03

 Phosphorous (mg/d)

33.1

75.4

6.9

0.30***

 Magnesium (mg/d)

31.5

79.2

3.8

0.40***

 Potassium (mg/d)

30.7

73.1

10.0

0.20*

 Sodium (mg/d)

20.0

66.1

10.7

0.04

 Iron (mg/d)

37.6

79.2

5.3

0.38***

 Zinc (mg/d)

30.7

71.5

6.1

0.25**

 Vitamin A (µg RE/d)

23.8

53.8

13.1

− 0.1

 Vitamin E (µg/d)

30.0

68.4

13.1

0.1

 Vitamin C (mg/d)

21.5

57.7

16.1

− 0.07

 Vitamin B2 (mg/d)

31.5

70.0

6.1

0.24**

 Vitamin B6 (mg/d)

26.9

72.3

12.3

0.16

 Vitamin B12 (µg/d)

23.8

58.4

13.8

− 0.09

Average

28.9

69.2

9.6

 
  1. Kappa statistics (k) is significant at *P ≤ 0.05, **P < 0.01, **P < 0.01 (2-tailed)