Identifying Substance Use and High-Risk Sexual Behavior Among Sexual and Gender Minority Youth by Using Mobile Phone Data: Development and Validation Study

Mehrab Beikzadeh   ¹ , MS ;   Ian W Holloway   ² , MPH, MSW, PhD ;   Kimmo Kärkkäinen   ³ , PhD ;   Chenglin Hong   ⁴ , PhD ;   Cory Cascalheira   ⁵ , PhD ;   Elizabeth S C Wu   ² , MPH ;   Callisto Boka   ⁶ , BA ;   Alexandra C Avendaño   ² , MA ;   Elizabeth A Yonko   ⁶ , MPH ;   Majid Sarrafzadeh   ¹ , PhD

¹ Department of Computer Science, UCLA Samueli School Of Engineering, University of California, Los Angeles, Los Angeles, CA, United States

² Department of Social Welfare, University of California, Los Angeles, Los Angeles, CA, United States

³ Optum, Los Angeles, CA, United States

⁴ School of Social Work, University of Connecticut, Hartford, CT, United States

⁵ Addiction Treatment Center, VA Puget Sound Health Care System, Seattle, WA, United States

⁶ Department of Epidemiology, UCLA Fielding School of Public Health, University of California, Los Angeles, Los Angeles, CA, United States