Table 4

Baseline (age 25) predictors of fruits and vegetable and whole grain intake at follow up (age 33 years). Multiple linear regression analyses; unstandardized (B) and standardized regression coefficients (β). The Oslo Youth Study 1991 – 1999.

Dietary habits at follow-up Predictors

Daily fruits and vegetable intake

Daily whole grain intake


Model 1

Men

Women

Men

Women


Psychosocial factors at baseline

B

β

B

β

B

β

B

β

Attitude

10.43

0.17*

1.07

0.02

-1.51

-0.04

3.84

0.13

Subjective norm

-12.92

-0.18*

-4.41

-0.05

-2.72

-0.06

-7.91

-0.22**

Perceived behaviour control

-11.48

-0.03

88.07

0.21**

23.68

0.09

22.18

0.12

Perceived social norms

33.52

0.08

79.74

0.18**

5.98

0.02

4.18

0.02

Intention

-5.33

-0.03

4.99

0.02

12.08

0.09

1.57

0.02

R2/R2 adjusted, %

3.7/1.6

10.1/8.4

2.1/0.0

7.1/5.4

Model 2

Model 1 + Demographic factors at follow-up

Attitude

11.17

0.18*

1.66

0.02

-1.31

-0.03

3.67

0.12

Subjective norm

-12.51

-0.17*

-2.46

-0.03

-1.56

-0.03

-7.41

-0.20**

Perceived behaviour control

-17.02

-0.04

85.70

0.20**

16.62

0.06

18.88

0.10

Perceived social norms

36.35

0.09

66.43

0.15*

2.64

0.01

2.19

0.01

Intention

-6.54

-0.03

7.36

0.02

10.89

0.08

1.55

0.02

Education

9.70

0.06

25.40

0.13*

18.03

0.17*

15.24

0.17*

Household income

2.03

0.02

-4.21

-0.03

1.92

0.02

1.21

0.02

Marital status

-27.58

-0.06

-73.40

-0.15

9.61

0.03

-1.86

-0.01

Children

-4.16

-0.02

17.05

0.08

-0.37

-0.00

-8.30

-0.08

R2/R2 adjusted, %

4.7/0.8

14.2/11.2

5.1/1.3

11.8/8.7

Model 3

Model 2 + baseline eating behaviour

Attitude

12.40

0.20*

0.91

0.01

-2.42

-0.06

3.85

0.12

Subjective norm

-11.06

-0.15*

0.01

0.00

1.02

0.02

-5.76

-0.16*

Perceived behaviour control

-28.44

-0.07

59.38

0.14*

11.60

0.04

10.72

0.06

Perceived social norms

19.52

0.05

52.97

0.12*

-10.87

-0.04

-6.04

-0.03

Intention

-3.04

-0.02

1.16

0.01

7.21

0.06

-0.79

-0.01

Education

0.08

0.00

13.05

0.07

14.63

0.14*

11.02

0.13*

Household income

-0.98

-0.01

-2.97

-0.02

-1.96

-0.02

0.54

0.01

Marital status

-37.43

-0.09

-56.32

-0.12

17.87

0.06

-1.79

-0.01

Children

-4.73

-0.03

11.99

0.05

0.63

0.01

-8.33

-0.09

Baseline eating behaviour†

75.27

0.31**

79.65

0.32**

31.79

0.25***

30.68

0.31***

R2/R2 adjusted, %

13.2/9.3

23.1/20.1

10.7/6.6

20.2/17.1


Marital status is coded 1 = married, 2 = single/divorced/widow, while all other variables are coded in ascending order. † The corresponding eating behaviour in 1991: fruit and vegetable score in 1991 for fruit and vegetable intake in 1999 (grams per day), whole grain score in 1991 for whole grain intake in 1999 (grams per day), *p < 0.05, **p < 0.01, ***p < 0.001.

Kvaavik et al. International Journal of Behavioral Nutrition and Physical Activity 2005 2:9   doi:10.1186/1479-5868-2-9

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