Canadian CALM trial maps why youth often face multiple mental-health diagnoses together

When young people seek mental-health care, a single neat diagnosis is often the exception. Depression can arrive with anxiety, ADHD can overlap with substance use, and sleep problems cut across the picture — a pattern researchers call mental-health multimorbidity. A study protocol published in BMC Psychiatry describes Canada’s CALM Master Observational Trial, designed to treat that overlap as the research subject rather than a statistical nuisance.

Led by Melissa Kimber of McMaster University and Flavia Vieira of the University of Calgary with a multidisciplinary team, CALM is recruiting across six Canadian sites, including CAMH and SickKids in Toronto, McMaster Children’s Hospital in Hamilton, CHEO and The Royal in Ottawa, and Alberta Health Services/University of Calgary. The trial is registered as NCT07699159. The Light protocol aims for roughly 1,600 youth aged 11 to 24 followed over 42 months; Scienmag’s Oct. 2 summary of the protocol notes that since a March 2025 launch the network had already enrolled hundreds of youth and caregivers. A Deep protocol subset adds expanded psychosocial, cognitive and neuroimaging assessments, including resting-state fMRI, diffusion imaging and arterial spin labelling.

CALM borrows a master observational trial design used elsewhere in medicine: a harmonized real-world cohort that can also host randomized studies. The protocol paper and trial registry describe embedded work on sleep, stigma and complex needs, including Narrative Enhancement Cognitive Therapy for Youth. Support includes the Ontario Brain Institute and foundation partners. For clinicians and families, the bet is evidence that mirrors how adolescents actually present — not one-disorder-at-a-time trials that leave co-occurring symptoms off the page.

This article is for general information only and is not a substitute for professional medical advice. Consult a qualified clinician about personal health decisions.

Sources: BMC Psychiatry protocol (DOI); ClinicalTrials.gov NCT07699159; Scienmag summary.