Is internet-based parent training for everyone? Predictors and moderators of outcomes in group vs. internet-based parent training for children with disruptive behavior problems.

Parent training is an effective treatment for disruptive behavior problems in children. However, as there is limited access to traditional face-to-face treatment, other delivery formats have been evaluated. This study aims to evaluate possible predictors and moderators of outcome, completion and engagement in parent training when delivered in group or through the internet. A recent randomized controlled non-inferiority trial (N = 161) demonstrated equal effectiveness of the parent training program Comet when delivered in group (gComet) and through the internet (iComet). Demographic, clinical and theory-driven variables were studied to find predictors and moderators of treatment effect, completion and engagement. Linear mixed effects models were used to determine predictors and moderators of change in disruptive behavior from baseline to the 3- and 12-month follow-up. Most variables did not have significant predictive or moderating effects. However, there were some variables that predicted or moderated outcomes that may have implications for practice (e.g., comorbid emotional problems, preferred treatment format, and ADHD). This trial can contribute to guiding clinical work with children with disruptive behavior and results indicate that parent training in both treatment formats can be offered regardless of a range of demographic and clinical factors. Taking patients' treatment preferences into account can increase treatment completion. • Predictors and moderators of group-versus internet-based parent-training were evaluated. • Most demographic and clinical variables did neither predict nor moderate treatment effect. • Treatment preference predicted treatment completion; no variables moderated completion. • Comorbid emotional problems predicted larger treatment effects and more so in the group format of the intervention. [ABSTRACT FROM AUTHOR]