Engagement With a Mobile Phone–Based Life Skills Intervention for Adolescents and Its Association With Participant Characteristics and Outcomes: Tree-Based Analysis

Raquel Paz Castro   ¹ , PhD ;   Severin Haug   ¹ , PhD ;   Rudolf Debelak   ^{2, 3} , PhD ;   Robert Jakob   ⁴ , MSc ;   Tobias Kowatsch   ^{4, 5} , PhD ;   Michael P Schaub   ¹ , PhD

¹ Swiss Research Institute for Public Health and Addiction, University of Zurich, Zurich, Switzerland

² Department of Psychology, Psychological Methods, Evaluation and Statistics, University of Zurich, Zurich, Switzerland

³ Wilhelm Wundt Institute for Psychology, University of Leipzig, Leipzig, Germany

⁴ Centre for Digital Health Interventions, Department of Management, Technology, and Economics, ETH Zurich, Zurich, Switzerland

⁵ Centre for Digital Health Interventions, Institute of Technology Management, University of St.Gallen, St.Gallen, Switzerland