Table 1 Multinomial logistic regression testing associations between study year and participant demographics and endorsing health behaviors or social/environmental factors as the most important cause of morbidity compared with genetic factors

Study year

1982

4.4

53.7

1.91

1.67-2.19

<0.001

42.9

3.70

3.20-4.26

<0.001

1987

6.2

59.2

1.53

1.34-1.76

<0.001

34.5

2.20

1.91-2.54

<0.001

1992

9.9

59.1

0.97

0.86-1.09

0.599

30.9

1.37

1.21-1.55

<0.001

1997

9.2

66.0

1.17

1.05-1.31

0.005

24.8

1.24

1.09-1.40

0.001

2002 (ref.)

10.8

67.0

1.00

22.3

1.00

Age group

25-34

5.9

66.1

1.87

1.66-2.10

<0.001

28.0

1.32

1.17-1.50

<0.001

35-44

7.2

62.7

1.46

1.31-1.63

<0.001

30.1

1.17

1.04-1.31

0.008

45-54

8.9

57.6

1.09

0.98-1.21

0.111

33.4

1.06

0.95-1.18

0.315

55-64 (ref.)

9.7

56.8

1.00

33.5

1.00

Gender

Male

8.0

58.6

0.94

0.87-1.06

0.115

33.4

1.08

0.99-1.18

0.070

Female (ref.)

8.0

62.5

1.00

29.5

1.00

Education tertiles

1st

6.2

53.1

0.95

0.85-1.06

0.364

40.7

1.69

1.50-1.90

<0.001

2nd

8.3

60.9

0.97

0.87-1.07

0.836

30.8

1.41

1.27-1.55

<0.001

3^rd (ref.)

9.5

68.0

1.00

0.044

22.5

1.00