Suzanne E Gerritsen, Larissa S van Bodegom, Mathilde M Overbeek, Athanasios Maras, Frank C Verhulst, Dieter Wolke, Dimitris Rizopoulos, Giovanni de Girolamo, Tomislav Franić, Jason Madan, Fiona McNicholas, Moli Paul, Diane Purper-Ouakil, Paramala J Santosh, Ulrike M E Schulze, Swaran P Singh, Cathy Street, Sabine Tremmery, Helena Tuomainen, Gwendolyn C Dieleman, Rebecca Appleton, Nikolina Davidović, Sabrina Ferrari, Federico Fiori, Charlotte Gatherer, Gaëlle Hendrickx, Ingrid Holme, Renaud Jardri, Alfred Kolozsvari, Kate Lievesley, Mathilde Mastroianni, Virginie Maurice, Giorgia Morini, Aesa Parenti, Frédérick Russet, Melanie Saam, Ilyas Sagar-Ouriaghli, Anne Sartor, Giulia Signorini, Jatinder Singh, Priya Tah, Amanda Tuffrey, Therese AMJ van Amelsvoort, Pamela Varvara, Stefano Vicari, Leanne Walker, Anna Wilson, Helena Jerkovic, Clinical Child and Family Studies, LEARN! - Child rearing, APH - Mental Health, Child and Adolescent Psychiatry / Psychology, and Epidemiology
Background: The configuration of having separate mental health services by age, namely child and adolescent mental health services (CAMHS) and adult mental health services (AMHS), might be a barrier to continuity of care that adversely affects young people's mental health. However, no studies have investigated whether discontinuity of care in the transition period affects mental health. We aimed to discern the type of care young people receive after reaching the upper age limit of their CAMHS and examine differences in outcomes at 24-month follow-up between young people receiving different types of care. Methods: To assess mental health in young people from 39 CAMHS in eight European countries (Belgium, Croatia, France, Germany, Italy, Ireland, the Netherlands, and the UK), we did a longitudinal cohort study. Eligible young people were CAMHS users up to 1 year younger than the upper age limit of their CAMHS or up to 3 months older, if they were still in CAMHS. Information on mental health service use, mental health problems (ie, using the Health of the Nation Outcome Scale for Children and Adolescents, Youth Self-Report and Adult Self-Report, DSM-5, and ICD-10), and sociodemographic characteristics were collected using self-reported, parent-reported, and clinician-reported interviews and questionnaires. Mixed models were applied to assess relationships between baseline characteristics, mental health service use, and outcomes. Findings: The MILESTONE cohort included 763 young people. The participants were 60·0% female (n=458) and 40·0% male (n=305), 90·3% White (n=578), and had a mean age of 17·5 years (range 15·2–19·6 years). Over the 24-month follow-up period, 48 young people (6·3%) actively withdrew from the study. For young people, the higher their scores on the Health of the Nation Outcome Scale for Children and Adolescents (p=0·0009) and Youth Self-Report and Adult Self-Report (p=0·046), and who had a clinical classification of severe mental illness (p=0·0033), had suicidal thoughts or behaviours or self-harm (p=0·034), used psychotropic medication (p=0·0014), and had a self-reported or parent-reported need for continued treatment (p