Defining dropout from youth psychotherapy: how definitions shape the prevalence and predictors of attrition

Background and Aims: Attrition is a long-standing problem in mental health centres serving youth. However, attempts to understand attrition have not consistently identified the same risk factors. The way in which attrition was defined across studies may have had a significant impact on findings. This study examines three definitions of attrition across a large sample of children and adolescents receiving outpatient mental health services, and considers the different relationships observed between the identified predictors and each definition. Method: This study examined data collected concurrently from 1098 families who received services at an urban outpatient mental health clinic (OMHC). Logistic regression was used to examine the association between identified predictor variables and attrition, using three distinct definitions of attrition based on clinician judgment, missed last appointment, and specified dose. The results of each regression analysis were qualitatively compared to assess the impact on findings observed when applying different definitions of attrition. Results: As anticipated, observed predictors of attrition varied by definition. Ethnicity predicted attrition across all definitions. Residing in a single-caregiver household predicted attrition across two of the three definitions, while living with a non-biological family, receiving state-funded, low-income insurance support, having low parent-reported youth functioning, routine intakes (as compared to urgent intakes), and longer wait predicted attrition within only one definition. Conclusions: Rates and factors associated with attrition may vary substantially depending on how treatment attrition is defined. In the evaluation of attrition in youth mental health settings, the definition used should be clearly stated and should reflect the research question posed.