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Table 5 Relative validity of the food frequency questionnaire (FFQ)

From: Primary prevention of childhood obesity through counselling sessions at Swedish child health centres: design, methods and baseline sample characteristics of the PRIMROSE cluster-randomised trial

 

Food diary

FFQ

Food diary and FFQ

Mean

SD

Median

Mean

SD

Median

n

d†

95% CI

r

95% CI

Children

           

Fruits (t/d)

0.89

0.55

0.79

1.19

1.07

1.00

210

0.30

0.19; 0.42

0.42

0.31; 0.53

Vegetables (t/d)

0.74

0.38

0.71

1.83

1.11

1.57

212

1.08

0.96; 1.19

0.48

0.36; 0.58

Fish total (t/w)

1.11

1.06

1.00

1.65

1.68

1.47

211

0.54

0.33; 0.74

0.31

0.18; 0.42

French fries (t/m)

1.21

2.00

0.00

1.36

1.50

1.00

210

0.14

-0.12; 0.40

0.36

0.24; 0.48

Sugared drinks* (t/w)

2.80

2.65

2.00

2.41

2.90

1.50

211

-0.39

-0.65; -0.13

0.59

0.50; 0.67

Discretionary calories** (t/w)

8.38

4.39

8.00

9.16

5.79

8.05

212

0.75

0.18; 1.33

0.56

0.46; 0.65

Mothers

           

Fruits (t/d)

1.15

0.75

1.07

1.63

1.09

1.43

213

0.48

0.37; 0.59

0.60

0.50; 0.68

Vegetables (t/d)

1.31

0.49

1.29

2.76

1.40

2.57

213

1.44

1.29; 1.59

0.32

0.19; 0.43

Fish total (t/w)

1.86

1.53

1.50

2.25

1.92

2.00

205

0.36

0.13; 0.60

0.41

0.28; 0.51

French fries (t/m)

0.99

1.91

0.00

1.23

1.54

1.00

211

0.23

0.00; 0.46

0.34

0.22; 0.46

Sugared drinks* (t/w)

1.43

1.89

1.00

1.33

1.94

0.75

209

-0.13

-0.37; 0.11

0.43

0.32; 0.54

Discretionary calories** (t/w)

8.29

4.29

8.00

8.51

5.60

7.42

198

0.19

-0.45; 0.83

0.52

0.41; 0.61

  1. r = Spearman correlation, t = times, d = day, w = week, m = month, CI = confidence interval. *Sugared drinks include soda with sugar, lemonade, and chocolate drinks; **Discretionary calories include savoury snacks, sugared drinks, sweets, chocolate, pastries, cake, and ice cream. †Difference between mean FFQ and mean food diary.