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Table 3 Difference in food consumption and Pearson’s correlation coefficients between the FFQ and 24-hour recalls (N=128)

From: Relative validity of the food frequency questionnaire used to assess dietary intake in the Leiden Longevity Study

 

FFQ

24-hour recall

 

Pearson's correlation coefficients

Food group

Mean

S.d.

Mean

S.d.

p-value a

Crude a

Adj a,b

Adj, deatt a,b,c

Potatoes (g)

90

57

104

61

0.88

0.25

0.21

0.50

Non-alcoholic beverages (g)

790

311

1631

601

<.0001

0.14d

0.17d

0.15d

Bread (g)

126

55

133

54

0.002

0.79

0.71

0.93

Eggs (g)

12

10

13

17

<.0001

0.46

0.46

-

Fruit (g)

184

124

163

118

0.28

0.50

0.51

0.62

Pastry, cake and biscuits (g)

36

23

41

33

0.13

0.63

0.65

0.86

Cereal products and binding agents (g)

43

35

26

33

<.0001

0.41

0.40

-

Vegetables (g)

136

72

141

76

0.80

0.24

0.23

0.41

Savory sandwich fillings (g)

2

5

2

5

0.01

0.38

0.39

0.45

Cheese (g)

36

38

30

20

0.38

0.46

0.51

0.61

Milk and milk products (g)

311

221

328

223

0.27

0.69

0.68

0.75

Soya products and vegetarian products (g)

10

33

6

22

0.01

0.50

0.51

0.66

Nuts, seeds and snacks (g)

32

26

18

24

<.0001

0.24

0.25

0.40

Legumes (g)

8

11

2

9

<.0001

−0.02d

−0.01d

-

Composite dishes (g)

14

15

28

54

0.0001

0.10d

0.10d

-

Soups (g)

53

62

52

76

<.0001

0.31

0.30

0.66

Sugar, confectionary, sweet fillings and sweet sauces (g)

28

24

25

23

0.02

0.67

0.66

0.81

Fats, oils and savory sauces (g)

40

20

40

27

0.32

0.53

0.54

0.77

Fish (g)

14

14

19

40

<.0001

0.37

0.37

0.46

Meat, meat products and poultry (g)

75

34

94

48

0.02

0.56

0.56

0.98

Alcoholic beverages (g)

196

243

217

287

0.05

0.78

0.75

0.88

  1. a = Based on log-transformed values; b = Correlation coefficients were adjusted for energy intake; energy-adjusted intakes were calculated using the residual method; c = Correlation coefficients were de-attenuated (corrected for within-person variation [derived from crude, untransformed data] in the 24-hour recalls); d = Correlation coefficients are not significantly different from zero.