Meeting the challenges of implementing an intervention to promote work ability and health-related quality of life at construction worksites: a process evaluation.

Objective: To evaluate the process of a prevention program among construction workers.
Methods: The program consisted of training sessions of a physical therapist and an empowerment trainer, and a Rest-Break Tool. Data on seven process items were collected by means of questionnaires and interviews.
Results: Recruiting construction companies to participate was difficult. The therapists and trainer largely provided the training sessions as intended, but the Rest-Break Tool was poorly implemented. Construction workers (n = 171) showed high reach (84%) and moderate attendance rates (three of four sessions). Sixty-four percent of the construction workers recommended the overall program to colleagues. Company size, economic recession, engagement of the management, and intervention year influenced dose delivered and satisfaction.
Conclusions: The study showed a successful reach, dose and fidelity, and moderate satisfaction. Furthermore, contextual factors played an important role during the implementation.