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Table 2 Usual intake distribution (g/day) for consumers only in the different age strata, Belgian National Food Consumption Survey 2004

From: The added value of food frequency questionnaire (FFQ) information to estimate the usual food intake based on repeated 24-hour recalls

A. Water

 

\( {\sigma}_{b, t}^2 \)

\( {\sigma}_{w, t}^2 \)

σ 2

mean

P0.05

P0.25

P0.5

P0.75

P0.95

15–18 year

Original BNFCS2004

3.4

4.7

8.1

600

81

330

547

808

1304

Simulated BNFCS2004

2.9

4.0

6.9

601

69

329

553

807

1302

Simulated “True”

/

/

3.3

595

82

324

540

807

1282

19–59 year

Original BNFCS2004

7.6

6.2

13.8

712

99

372

630

960

1596

Simulated BNFCS2004

10.2

8.5

18.7

668

91

336

585

905

1528

Simulated “True”

/

/

7.5

711

94

367

630

961

1581

60–74 year

Original BNFCS2004

9.5

5.3

14.8

610

75

286

515

828

1474

Simulated BNFCS2004

8.0

4.1

12.1

602

73

280

504

815

1467

Simulated “True”

/

/

9.6

608

71

281

510

825

1458

B. Cheese

15–18 year

Original BNFCS2004

0.40

1.61

2.01

30

9

19

28

39

58

Simulated BNFCS2004

0.33

1.74

2.07

29

10

19

27

37

54

Simulated “True”

/

/

0.40

30

8

18

28

39

59

19–59 year

Original BNFCS2004

0.26

0.93

1.19

34

8

21

32

45

68

Simulated BNFCS2004

0.40

1.22

1.62

34

7

20

32

45

69

Simulated “True”

/

/

0.26

35

8

21

33

46

70

60–74 year

Original BNFCS2004

0.23

0.33

0.56

29

5

15

25

38

65

Simulated BNFCS2004

0.21

0.28

0.49

28

6

14

24

37

63

Simulated “True”

/

/

0.23

28

5

14

25

38

64

C. Fat Spread

15–18 year

Original BNFCS2004

0.72

0.99

1.71

12

2

5

9

15

31

Simulated BNFCS2004

1.22

0.68

1.90

11

1

4

7

14

32

Simulated “True”

/

/

0.71

12

2

5

9

15

30

19-59 year

BNFCS2004

1.38

1.16

2.54

20

2

7

13

25

58

Simulated BNFCS2004

1.51

1.18

2.69

20

3

7

14

26

58

Simulated “True”

/

/

1.49

20

2

7

14

25

60

60–74 year

BNFCS2004

3.03

2.18

5.21

33

5

14

26

44

84

Simulated BNFCS2004

2.67

2.27

4.94

35

6

16

28

46

85

Simulated “True”

/

/

3.02

33

4

14

26

45

85

  1. Abbreviations: original BNFCS2004 the usual intake distribution obtained from the original BNFCS2004 data, simulated BNFCS2004 the usual intake distribution obtained from the simulated BNFCS2004 data, simulated “true” the usual intake distribution obtained from the simulated “true” intake data. The table also shows the residual variance (σ 2) and the division of this variance in the within (\( {\sigma}_{w, t}^2 \))- and between (\( {\sigma}_{b, t}^2 \))-individual variance, these variances were estimated on the transformed scale