Table 1 Participant demographic characteristics data

Age

26–35 years

36–45 years

46–60 years

  n

4

6

4

Place of residence

Berlin

Cologne

Frankfurt/Main

  n

5

6

3

School education

High school diploma/technical high school diploma

Qualification for admission to technical college

Secondary school leaving certificate

No school leaving certificate

  n

8

2

3

1

Vocational training

Course completed

Vocational training

No vocational training

  n

7

5

2