ArticleJCPP advances2026
Diagnostic variability of mental disorders in adolescence: A longitudinal study across transition boundary age.
Article in JCPP advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Correct psychiatric diagnoses represent a prerequisite for the efficacy of treatment, especially during adolescence, a critical period for the onset of mental health disorders. Diagnoses can evolve over time, influenced by factors such as changes in symptoms, treatment effects, and comorbidities. The transition from Child and Adolescent Mental Health Services (CAMHS) to Adult Mental Health Services (AMHS) presents challenges due to differences in diagnostic criteria and treatment approaches. This study explores whether and how psychiatric diagnoses change during this transition, aiming to examine the prevalence and composition of primary diagnoses and identify predictors of diagnostic change. Methods: From the MILESTONE project total sample, 770 participants aged 17-19 with available diagnoses and clinical data were included and assessed at four-time points. We categorised participants into 10 diagnostic groups based on shared clinical features. Statistical analysis included multilevel logistic regression to examine diagnosis changes, with a Sankey plot to visualise transitions. Results: Clinically, anxiety/trauma disorders (25.1%) were the most common at baseline, followed by depression/bipolar (21.3%) and attention deficit hyperactivity disorder (15.6%). Most diagnoses remained stable over time, with showing high stability; depression/bipolar showed moderate stability (80.7%), while schizophrenia spectrum disorders and substance use disorders exhibited nearly perfect consistency (100% and 85.7%, respectively). Multilevel logistic regression revealed that higher externalising scores (OR = 2.90; Conclusion: This study highlights the diagnostic stability of most psychiatric conditions during the transition from CAMHS to AMHS. Given the complexity of adolescent mental health, accurate and continuous assessment is crucial. Understanding the evolving nature of psychiatric symptoms during adolescence will improve diagnostic accuracy and inform better interventions, fostering long-term mental health outcomes.
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