Table 1.

Selected sample background.

Sample characteristics	Percentage
Age (years)	39.7 ± 1.2
Marital status
Single	56.8
Married	43.2
Education
Primary	3.2
Secondary	77.4
High	19.5
Employment
Unemployed	33.3
Manual professions	51.8
Nonmanual	8.7
Retirees	6.2
Income level
Below average	43.3
Average	34.8
Above average	22.0