Problematic Internet Use Before and During the COVID-19 Pandemic in Youth in Outpatient Mental Health Treatment: App-Based Ecological Momentary Assessment Study

Meredith Gansner   ¹ , BA, MD ;   Melanie Nisenson   ¹ , BA, MSc ;   Vanessa Lin   ¹ , BA, MSc ;   Sovannarath Pong   ¹ , BA, MSc ;   John Torous   ² , BSc, MD, MBI ;   Nicholas Carson   ¹ , BA, MD

¹ Department of Psychiatry, Cambridge Health Alliance, Cambridge, MA, United States

² Department of Digital Psychiatry, Beth Israel Deaconess Medical Center, Boston, MA, United States