Table 1 Demographic data of the sample (n = 27,085)

Gender, n (%)

 Male

7,155 (26)

 Female

19,930 (74)

Age, n (%)

 Under 19 years old

36 (0.1)

 20–29 years old

919 (3)

 30–39 years old

2,878 (11)

 40–49 years old

3,858 (14)

 50–59 years old

5,487 (20)

 60–69 years old

7,854 (29)

 70–79 years old

5,423 (20)

 80 years old and older

630 (2)

Body mass index (BMI), Mean (SD)

24 (4)

Socio-professional class, n (%)

 Farmers

142 (1)

 Craftsmen, merchants, company managers

1,147 (4)

 Executive and higher intellectual professions

11,383 (42)

 Intermediate professions

6,881 (25)

 Office workers

6,426 (24)

 Laborers

424 (2)

 Retired

134 (0.5)

 Students

133 (0.5)

 Non-working

113 (0.5)

 Missing

302 (1)

Education Level, n (%)

 High school diploma or less

4,604 (17)

 Bachelor’s degree

3,451 (13)

 University degree or higher

18,593 (69)

 Missing

437 (2)

Income, n (%)

 Less than 1,430 €/month OR less than 17,170 €/year

1,553 (6)

 from 1,430 to 2,000 €/month OR from 17,170 to 24,050 €/year

2,374 (9)

 from 2,000 to 2,700 €/month OR from 24,050 to 32,290 €/year

3,644 (13)

 from 2,700 to 3,780 €/month OR from 32,290 to 45,400 €/year

5,688 (21)

 from 3,780 to 4,800 €/month OR from 45,400 to 57,550 €/year

4,310 (16)

 from 4,800 to 8,710 €/month OR from 57,550 to 104,550 €/year

4,435 (16)

 More than 8 710 €/month OR more than 104 550 €/year

753 (3)

 I do not know

622 (2)

 I do not wish to answer

3,414 (13)

 Missing

292 (1)