Sociodemographic Differences in Logins and Engagement With the Electronic Health Coach Messaging Feature of a Mobile App to Support Opioid and Stimulant Use Recovery: Results From a 1-Month Observational Study

Lindsey M Filiatreau   ¹ , MPH, PhD ;   Hannah Szlyk   ² , MSSW, PhD ;   Alex T Ramsey   ² , MA, PhD ;   Erin Kasson   ² , MS, MSW ;   Xiao Li   ² , MS ;   Zhuoran Zhang   ² , MA ;   Patricia Cavazos-Rehg   ² , PhD

¹ Division of Infectious Diseases, School of Medicine, Washington University in St Louis, St Louis, MO, United States

² Department of Psychiatry, School of Medicine, Washington University in St Louis, St Louis, MO, United States