Table 1 Baseline characteristics of all invited subjects, responders at T1^a, responders at both T1 and T2^b, and the final prospective sample after exclusion^c

 Male

3852 (37.5)

2405 (38.8)

ref

-

1681 (40.0)

ref

-

1161 (38.8)

 Female

6422 (62.5)

3793 (61.2)

1.16

[1.07–1.26]**

2523 (60.0)

1.02

[0.89–1.17]

1828 (61.2)

  < 30

796 (7.7)

451 (7.3)

ref

-

269 (6.4)

ref

-

196 (6.6)

 30–39

2519 (24.5)

1556 (25.1)

0.81

[0.69–0.95]*

1048 (24.9)

0.82

[0.63–1.07]

733 (24.5)

 40–49

3118 (30.3)

1933 (31.2)

0.80

[0.68–0.94]**

1330 (31.6)

0.72

[0.55–.95]*

970 (32.5)

 50–59

2973 (28.9)

1775 (28.6)

0.89

[0.76–1.04]

1230 (29.3)

0.74

[0.56–.97]*

870 (29.1)

  > 59

868 (8.4)

483 (7.8)

1.06

[0.87–1.28]

327 (7.8)

0.83

[0.60–1.17]

220 (7.4)

 Not married

618 (13.1)

444 (13.8)

ref

-

309 (13.5)

 Married

2893 (61.2)

1982 (61.6)

1.21

[0.99–1.49]

1410 (61.6)

 Cohabiting

764 (16.2)

499 (15.5)

1.32

[1.04–1.67]

370 (16.2)

 Widowed

62 (1.3)

40 (1.2)

1.40

[0.78–2.51]

26 (1.1)

 Divorced

313 (6.6)

203 (6.3)

1.34

[0.98–1.82]

137 (6.0)

 Separated

75 (1.6)

47 (1.5)

1.47

[0.88–2.46]

38 (1.7)

 Missing data

1473 -

989 -

-

-

699 -

 Professionals

1757 (29.0)

1283 (31.3)

ref

-

904 (30.9)

 Armed forces and unspecified

32 (0.5)

20 (0.5)

1.78

[0.83–3.82]

15 (0.5)

 Legislators, senior officials and managers

587 (9.7)

464 (11.3)

0.81

[0.62–1.05]

307 (10.5)

 Technicians and associate professionals

2040 (33.7)

1323 (32.3)

1.66

[1.41–1.95]**

954 (32.6)

 Clerks

501 (8.3)

313 (7.6)

1.73

[1.36–2.21]**

244 (8.3)

 Service workers and shop and market sales workers

979 (16.2)

605 (14.8)

1.70

[1.40–2.05]**

443 (15.2)

 Skilled agricultural and fishery workers

2 (0.0)

1 (0.0)

2.85

[0.17–46.49]

0 (0.0)

 Craft and related trades workers

67 (1.1)

43 (1.0)

2.11

[1.19–3.75]*

29 (1.0)

 Plant and machine operators and assemblers

8 (0.1)

3 (0.1)

4.86

[0.81–29.35]

2 (0.1)

 Elementary occupations

76 (1.3)

45 (1.1)

2.10

[1.26–3.50]**

26 (0.9)

 Missing data

149 -

104 -

-

-

65 -

  > 15 years

1757 (29.0)

1283 (31.3)

ref

-

904 (30.9)

 13–15 years

2040 (33.7)

1323 (32.3)

1.66

[1.41–1.95]**

954 (32.6)

 10–12 years

1557 (25.7)

965 (23.5)

1.73

[1.46–2.05]**

718 (24.6)

  < 10 years

76 (1.3)

45 (1.1)

2.10

[1.26–3.50]**

26 (0.9)

 Unspecified

619 (10.2)

484 (11.8)

0.86

[0.67–1.10]

322 (11.0)

 Missing data

149 -

104 -

-

-

65 -

 0

1446 (23.3)

1001 (23.8)

ref

-

-

 1

1359 (21.9)

962 (22.9)

0.86

[0.71–1.04]

962 (32.2)

 2

1299 (21.0)

884 (21.0)

0.99

[0.82–1.20]

884 (29.6)

 3

1082 (17.5)

706 (16.8)

1.13

[0.92–1.38]

706 (23.6)

 4

680 (11.0)

437 (10.4)

1.13

[0.90–1.41]

437 (14.6)

 5

332 (5.4)

214 (5.1)

1.21

[0.90–1.63]

-