Engagement and Acceptability of Acceptance and Commitment Therapy in Daily Life in Early Psychosis: Secondary Findings From a Multicenter Randomized Controlled Trial

Evelyne van Aubel   ¹ , PhD ;   Thomas Vaessen   ^{1, 2} , PhD ;   Lotte Uyttebroek   ¹ , MSc ;   Henrietta Steinhart   ^{1, 3} , PhD ;   Annelie Beijer-Klippel   ^{1, 3, 4} , PhD ;   Tim Batink   ⁴ , PhD ;   Ruud van Winkel   ⁵ , PhD ;   Lieuwe de Haan   ⁶ , PhD ;   Mark van der Gaag   ^{7, 8} , PhD ;   Thérèse van Amelsvoort   ³ , MD, PhD ;   Machteld Marcelis   ^{3, 9} , PhD ;   Frederike Schirmbeck   ⁶ , PhD ;   Ulrich Reininghaus   ^{10, 11} , PhD ;   Inez Myin-Germeys   ¹ , PhD

¹ Center for Contextual Psychiatry, Psychiatry Research Group, Department of Neurosciences, KU Leuven, Leuven, Belgium

² Department of Psychology, Health & Technology, Faculty of Behavioural, Management and Social Sciences (BMS), University of Twente, Enschede, Netherlands

³ Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, Netherlands

⁴ Department of Lifespan Psychology, Faculty of Psychology, Open University, Heerlen, Netherlands

⁵ Center for Clinical Psychiatry, Psychiatry Research Group, Department of Neurosciences, KU Leuven, Leuven, Belgium

⁶ Department of Psychiatry, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands

⁷ Department of Clinical Psychology, VU Amsterdam, Amsterdam, Netherlands

⁸ Parnassia Psychiatric Institute, The Hague, Netherlands

⁹ Institute for Mental Health Care Eindhoven (GGzE), Eindhoven, Netherlands

¹⁰ Department of Public Mental Health, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany

¹¹ ESRC Centre for Society and Mental Health and Centre for Epidemiology and Public Health, Health Service and Population Research Department, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, United Kingdom