Table 1 Overview on additional study variables

 Global Assessment of Functioning

All

Global Assessment of Functioning Scale (GAF [30, 31])

 Diagnosis

All

Derived from International Neuropsychiatric Interviews (MINI [32])

 Indication of treatment

All

 Childhood trauma

All

Childhood trauma screener [51]

 Work-related diagnostics

Intervention group

E.g. work history, job description, work tasks, work relationships, person-job fit [25, 33]

 Sociodemographic variables I

All

Age, gender, work experience

 Sociodemographic variables II

All

Marital status, profession, weekly working hours, shift work, leadership position, company size, professional perspective, physical illness

 Migration status

All

Basic set of indicators for mapping migrant status; German nationality, parental German nationality [52]

 Demands of immigration

Participants with migrant background

Demands of Immigration Scale (DIS [53]

 Mental health - depression

All

Depression items of the Patient-Health Questionnaire (PHQ-9 [54,55,56])

 Mental health - anxiety

All

Generalized Anxiety Disorders (GAD-2 [57])

 Mental health – somatoform disorders

All

Somatic Symptom Scale 8 (SSS-8 [58])

 General health status

All

General health status item of the Veterans RAND 12 (VR-12 [59])

 Cultural adaptation

Participants with migrant background

Frankfurt acculturation scale (FRAKK [60, 61])

 Work productivity and activity impairment

All

Work productivity and activity impairment Questionnaire (WPAI [62])

 Subjective work ability

All

First item of the Work ability index (WAI [63, 64])

 Work role functioning

All

Work Role Functioning Questionnaire (WRPQ 2.0 [65]) – short version

 Psychosocial working conditions

All

Third version of the Copenhagen Psychosocial Questionnaire (COPSOQ [66, 67]) including scales of job demands, control, development opportunities and social support

 Psychosocial safety climate

All

Short version of the Psychosocial Safety Climate Questionnaire [68]

 Personality Functioning

All

German version of the Level of Personality Functioning-screener brief form (LPFS-BF 2.0 [69, 70])

 Integrated care

All

Modified version of a questionnaire on experiences on integrated care including scales of general coordination and coordination within and between care teams [71]