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The problem
Intervention: Pharmacological treatment of ADHD with various medications (methylphenidate as primary comparison, alternative medications studied), including timing of initiation and treatment switching patterns
Who it was tested with: Children (<13 years) and adolescents (13-17 years) with incident ADHD diagnosis between 2007-2018 in Sweden; 24,117 with comorbid ASD, 79,830 with ADHD alone.
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"The primary outcome was changes in rates of inpatient psychiatric hospitalisations, accidental injuries and specialist care visits for substance use, depressive or anxiety disorders in the 1 year after versus the 1 year before medication initiation." The study used within-individual comparisons across a large population-based cohort to measure whether different medication choices associated with differential changes in negative outcomes, providing observational evidence but not definitive causal evidence about medication efficacy.
Observational design cannot establish causation for medication effects; study did not assess symptom improvement directly, only negative clinical outcomes; possible confounding by indication and unmeasured factors affecting treatment choices
Across countries and designs
1 study · 1 country
