Table 4.

Secondary endpoints.

Secondary objective	Secondary endpoints
To explore how participants engage with the app and describe usage patterns	Demographic, clinical, and treatment factors (as measured by Client Service Receipt Inventory, COMSa, and SUREb at baseline and 2-month follow-up) associated with (in)completion of Smart Track ROMc items Data analytics captured daily across the data collection period
To provide preliminary evidence for the psychometric properties of the ROM items administered by Smart Track	Internal reliability and convergent and divergent validity of COMS and SURE items administered by Smart Track (relative to the complete versions administered at baseline and 2-month follow-up)
To provide preliminary evidence for participant-reported outcomes in behaviors of concern, recovery, and mental health	Participant-reported progress across the 2-month period of app usage in the following: Addictive behaviors (COMS [41] and item adapted from the Screener for Substance and Behavioral Addictions [42]) Addiction recovery (SURE [43]) Mental health (Kessler [44,68])

^aCOMS: Client Outcome Management System.

^bSURE: Substance Use Recovery Evaluator.

^cROM: routine outcome monitoring.