Correlates of Engagement and Associations With Outcomes in a Cannabis Harm-Reduction Mobile App for Youth With First-Episode Psychosis: Exploratory Analysis of the CHAMPS Pilot Randomized Controlled Trial

Amani Mahroug   ^{1, 2} , MSc ;   Pamela Lachance-Touchette   ² , PhD ;   Stéphanie Coronado-Montoya   ^{1, 2} , PhD ;   Amal Abdel-Baki   ^{1, 2, 3} , MSc, MD ;   José Côté   ^{2, 4} , PhD ;   Candice Crocker   ⁵ , PhD ;   David Neil Crockford   ^{6, 7} , MD ;   Jean-Gabriel Daneault   ⁸ , MD ;   Simon Dubreucq   ^{1, 2} , MD, MSc ;   Maxime Dussault-Laurendeau   ⁹ , MD ;   Benedikt Fischer   ^{10, 11, 12, 13, 14} , PhD ;   Tania Lecomte   ^{15, 16} , PhD ;   Sophie L’Heureux   ^{17, 18} , MD ;   Clairélaine Ouellet-Plamondon   ^{1, 2, 3} , MSc, MD ;   Marc-André Roy   ^{18, 19, 20} , MSc, MD ;   Ovidiu Tatar   ^{1, 2} , PhD, MD ;   Philip G Tibbo   ⁵ , MD ;   Marie Villeneuve   ¹ , MD ;   Anne Wittevrongel   ² , BSc, MPS ;   Didier Jutras-Aswad   ^{1, 2, 21} , MSc, MD

¹ Department of Psychiatry and Addiction, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada

² Research Centre, Centre Hospitalier de l’Université de Montréal, Montréal, QC, Canada

³ Department of Psychiatry, Centre Hospitalier de l’Université de Montréal, Montréal, QC, Canada

⁴ Faculty of Nursing, Université de Montréal, Montréal, QC, Canada

⁵ Department of Psychiatry, Dalhousie University, Halifax, NS, Canada

⁶ Department of Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada

⁷ Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada

⁸ Hôpital en santé mentale Albert-Prévost, Montréal, QC, Canada

⁹ Hôpital Charles Lemoyne, Longueuil, QC, Canada

¹⁰ Centre for Applied Research in Addiction and Mental Health, Simon Fraser University, Vancouver, BC, Canada

¹¹ Research and Graduate Studies Division, University of the Fraser Valley, Abbotsford, BC, Canada

¹² Department of Psychiatry, University of Toronto, Toronto, ON, Canada

¹³ School of Population Health, University of Auckland, Auckland, New Zealand

¹⁴ Department of Psychiatry, Federal University of Sao Paulo, Sao Paulo, Brazil

¹⁵ Department of Psychology, University of Montréal, Montréal, QC, Canada

¹⁶ Centre de Recherche de l'Institut Universitaire en Santé Mentale de Montréal, Montréal, QC, Canada

¹⁷ Centre Intégré Universitaire de Soins et Services Sociaux de la Capitale Nationale, Institut Universitaire en Santé Mentale, Clinique Notre-Dame des Victoires, Québec City, QC, Canada

¹⁸ Department of Psychiatry and Neurosciences, Laval University, Laval, QC, Canada

¹⁹ Centre de Recherche de l'Institut Universitaire en Santé Mentale de Québec, Québec City, QC, Canada

²⁰ Centre de Recherche CERVO, Québec City, QC, Canada

²¹ University Institute on Addictions, Montréal, QC, Canada