Methods: In a cluster randomised factorial trial 120 Primary Healthcare Units (PHCUs) were randomised to eight groups: care as usual, training and support, financial reimbursement, and the opportunity to refer patients to an internet-based brief intervention (e-BI); paired combinations of these three strategies, and all three strategies combined. To explore the impact of initial role security and therapeutic commitment on implementing brief interventions, we performed multilevel linear regression analyses adapted to the factorial design.
Results: Data from 746 providers of 120 PHCUs were included in the analyses. Baseline role security and therapeutic commitment were found not to influence implementation of brief interventions. Furthermore there were no significant interactions between these characteristics and allocated groups.
Conclusions: The extent to which providers’ managed to change their brief intervention proportions when submitted to different implementation strategies was not determined by their initial attitudes towards alcohol problems. In future research more attention is needed for the causal relation between these parameters, as it can inform us whether to focus on these or not in implementation trajectories.