Table 1 General characteristics of recruited sample [9]

 Male

14

 Female

16

 25–29

4

 30–39

16

 40–49

5

 50–59

4

Age (mean), years

37.66

 Range

33–58

 Mean

40.64

 Fulltime student

6

 Student with job

4

 Academic

4

 Printing job

1

 Police officer

1

 Sales person

2

 Driving instructor

1

 Sound engineer

1

 Nurse

1

 Industrial mechanic

1

 Office assistant

2

 Bus driver

1

 Administration secretary

1

 Unemployed

4

 Single / or no current relationship

15

 Married / or in a relationship

13

 Divorced

2

 Children

9

 No children

21