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Table 4 Relative validity of food groups for the food-frequency questionnaire (n = 21)

From: Reproducibility and relative validity of a newly developed web-based food-frequency questionnaire for assessment of preconception diet

 

FFQ 1

WFR

Spearman’s r

P

CC%

GM%

Kappa k

P

Median

(P25, P75)

Median

(P25, P75)

Milk, yoghurt, milk desserts (ml/day)

184

(103, 335)

222

(117, 424)

0.63

0.002

52

0

0.28

0.066

Cheese (g/day)

20

(10, 31)

35

(13, 54)

0.62

0.003

62

5

0.43

0.005

Eggs (g/day)

18

(16, 54)

21

(7.8, 43)

0.72

< 0.001

52

0

0.28

0.061

Poultry (g/day)

22

(11, 54)

23

(3.6, 67)

0.50

0.020

52

14

0.29

0.059

Red meat, non-processed (g/day)

12

(10, 20)

18

(7.4, 32)

0.20

0.392

38

14

0.06

0.689

Red meat, processed (g/day)

14

(1.8, 19)

22

(0, 56)

0.40

0.077

38

5

0.06

0.689

Liver-pate (g/day)

0

(0, 7.1)

0

(0, 6.3)

0.71

< 0.001

71

5

0.50

0.002

Meat dishes (g/day)

45

(23, 66)

0

(0, 0)

0.04

0.873

33

5

< 0.01

1.000

Fatty fish (g/day)

11

(5.4, 21)

0

(0, 17)

0.03

0.891

38

29

0.13

0.301

Lean fish (g/day)

14

(0, 29)

0

(0, 17)

0.10

0.657

19

10

−0.09

0.393

Fish spread (g/day)

7.9

(0, 14)

0

(0, 17)

0.72

< 0.001

67

10

0.49

< 0.001

Fish dishes (g/day)

11

(0, 11)

0

(0, 42)

0.12

0.621

33

19

0.02

0.869

Breakfast cereal, high grain (g/day)

14

(7.1, 107)

22

(2.6, 77)

0.70

< 0.001

57

0

0.36

0.021

Rice, pasta, noodle (g/day)

76

(46, 113)

52

(13, 89)

0.15

0.505

43

19

0.14

0.376

Bread, crispbread, low fibre (g/day)

5.7

(0, 17)

68

(34, 87)

0.59

0.005

43

5

0.15

0.299

Bread, crispbread, high fibre (g/day)

102

(34, 142)

61

(18, 112)

0.58

0.005

43

5

0.13

0.377

Nuts, almonds (g/day)

1.4

(0.7, 7.1)

1.9

(0, 17)

0.53

0.013

62

5

0.43

0.004

Potatoes (g/day)

33

(20, 68)

0

(0, 21)

−0.14

0.539

24

38

−0.13

0.371

Vegetables (g/day)

116

(75, 189)

193

(120, 297)

0.70

< 0.001

52

10

0.29

0.060

Fruits (g/day)

172

(50, 249)

117

(74, 279)

0.71

< 0.001

52

0

0.28

0.070

Sugar, sweets, desserts (g/day)

28

(12, 37)

17

(7.4, 41)

0.39

0.081

43

14

0.15

0.339

Oils, butter, margarine (g/day)

2.1

(0.4, 16)

12

(4.7, 22)

0.81

< 0.001

76

0

0.65

< 0.001

Coffee, tea, water (ml/day)

964

(789, 1323)

1383

(771, 1858)

0.56

0.009

52

5

0.29

0.063

Juice, sweet drinks (ml/day)

171

(111, 257)

212

(78, 482)

0.66

0.001

52

0

0.29

0.060

Alcohol (ml/day)

53

(1.4, 154)

0

(0, 120)

0.69

< 0.001

62

5

0.42

0.003

Pizza (g/day)

43

(21, 43)

18

(0, 65)

0.47

0.032

62

19

0.37

0.019

Salty snacks (g/day)

5.7

(2.9, 8.6)

9.1

(1.9, 21)

0.01

0.956

43

33

0.14

0.350

Mixed dishes (g/day)

84

(79, 173)

15

(0, 38)

0.07

0.774

38

19

0.07

0.635

  1. Food intake (gram/milliliter per day) for the food-frequency questionnaire (FFQ) and the 7-day weighed food record (WFR) for food groups (median, 25th and 75th percentile, Spearman’s rank correlation coefficient, percent correctly classified (CC) and grossly misclassified (GM) into tertiles of intake, Cohen’s Kappa value). Statistically significant p-values marked in bold
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