Table 1 Variables of the study instrument used in the analyses
Variables | Name and source of the original scales and items | α | Items (n) |
|---|---|---|---|
Socio-demographic factorsa | Â | 18 | |
Health behaviour | |||
 Physical activity | Health Questionnaire age 18–64 years [29] | – | 1 |
 Dietary habits | Food Frequency Questionnaire [30] | – | 15 |
 Smoking | Health Questionnaire age 18–64 years [7] | – | 2 |
 Alcohol consumption | – | 3 | |
Health status | |||
 General health status | Survey in vocational schools in Bielefeld [36] | – | 1 |
 Diseases and complaints | Work Ability Index – Questionnaire [33] | – | 6 |
 Self-efficacy | Self-efficacy scale [24] | 0.85 | 10 |
 Irritation | Irritation scale [22] | 0.88 | 8 |
Occupational situation and prospects | |||
 Job satisfaction | 0.81 | 7 | |
 Job strain and prospects | Additional questions (e.g., taking into account the current work situation, do you want to stay in this profession for the next five years?) | – | 3 |