The Effects of Internet-Based Cognitive Behavioral Therapy for Suicidal Ideation or Behaviors on Depression, Anxiety, and Hopelessness in Individuals With Suicidal Ideation: Systematic Review and Meta-Analysis of Individual Participant Data

Lasse B Sander   ¹ , PhD ;   Marie Beisemann   ² , MSc ;   Philipp Doebler   ² , PhD ;   Hannah Moon Micklitz   ¹ , MSc ;   Ad Kerkhof   ³ , PhD ;   Pim Cuijpers   ³ , PhD ;   Philip Batterham   ⁴ , PhD ;   Alison Calear   ⁴ , PhD ;   Helen Christensen   ^{5, 6} , PhD ;   Eva De Jaegere   ⁷ , MSc ;   Matthias Domhardt   ⁸ , MSc ;   Annette Erlangsen   ⁹ , PhD ;   Ozlem Eylem-van Bergeijk   ¹⁰ , PhD ;   Ryan Hill   ¹¹ , PhD ;   Charlotte Mühlmann   ⁹ , PhD ;   Marie Österle   ¹ , MSc ;   Jeremy Pettit   ¹² , PhD ;   Gwendolyn Portzky   ⁷ , PhD ;   Lena Steubl   ⁸ , MSc ;   Bregje van Spijker   ⁴ , PhD ;   Joseph Tighe   ⁵ , PhD ;   Aliza Werner-Seidler   ⁵ , PhD ;   Rebekka Büscher   ¹ , MSc

¹ Medical Psychology and Medical Sociology, Faculty of Medicine, University of Freiburg, Freiburg, Germany

² Department of Statistics, Technical University of Dortmund, Dortmund, Germany

³ Department of Clinical, Neuro and Developmental Psychology, Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam, Amsterdam, Netherlands

⁴ Centre for Mental Health Research, College of Health and Medicine, The Australian National University, Canberra, Australia

⁵ Black Dog Institute, University of New South Wales, Sydney, New South Wales, Australia

⁶ School of Medicine, University of New South Wales, Sydney, New South Wales, Australia

⁷ Department of Head and Skin, Flemish Centre of Expertise in Suicide Prevention, Ghent University, Ghent, Belgium

⁸ Department of Clinical Psychology and Psychotherapy, Ulm University, Ulm, Germany

⁹ Danish Research Institute for Suicide Prevention, Mental Health Centre Copenhagen, Copenhagen, Denmark

¹⁰ Faculty of Behavioral and Social Sciences, Webster University Leiden, Leiden, Netherlands

¹¹ Department of Psychology, Louisiana State University, Baton Rouge, LA, United States

¹² Department of Psychology, Center for Children and Families, Florida International University, Miami, FL, United States