Randomization and blinding
BLIND
Randomization was performed at the organizational level. The thirteen participating organizations were grouped into clusters of two to four organizations based on their sector (e.g. hospitality) and size (medium-sized or large). Next, each cluster was randomized, and organizations were allocated to either the control or the intervention group using an online web service (random.org). For example, two large organizations within the hospitality sector were grouped, and they were randomly allocated to either the control or intervention group. Organizations in the intervention group received the intervention soon after baseline data were collected, and organizations in the control group were put on a waitlist and asked to continue with their usual practice. The organizations in the control group received the same intervention after 12-month follow-up data have been collected.It was not possible to blind the organizations or the managers due to the design of the prevention program. Additionally, two organizations dropped out after randomization because they were not satisfied with their group allocation, leaving a total of 11 organizations (control: n = 5 organizations; intervention: n = 6 organizations) participating in the larger evaluation at baseline.The prevention program was delivered by consultants from Alna. Their roles were to advise and act as health educators. None of the consultants had any role in the program evaluation.