Sampling procedure and description
DISEASE
Before participants were recruited, the minimum sample size was calculated using a repeated measures within-between interaction analysis of variance design in GPower 3.1 [During the data collection period, 446 employees took part in the intervention. Three hundred eighty-seven employees registered their interest to participate in the study. 328 (85%) participants met the first inclusion criterion of being engaged in office work occupation, and 45 (12%) people were ineligible owing to assembly work tasks; a further 14 (4%) were ineligible owing to construction work duties. All 328 participants met the second inclusion criterion, i.e. absence from acute mental or physical disease, and completed the survey at the start of the intervention. In total, 149 (39%) participants completed the survey after the intervention as well as at the first follow-up measurement after 6 months and the second follow-up measurement after 18 months. A detailed overview of participant enrolment is shown in Fig. Overview of participant enrolment and drop out over the course of the data collection period