Summary (participants)

Number of participants screened Number of participants included Participants were randomly assigned to 1 of X possible drug condition orders Number of participants followed up Number of withdrawals Diagnostic and Statistical Manual of Mental Disorders (DSM) or International Classification of Diseases (ICD) diagnosis of attention deficit hyperactivity disorder (ADHD) (combined (%), hyperactive‐impulsive (%), inattentive (%)) Age (years) (mean, range) IQ (mean, range) Sex (male, female) Methylphenidate naive (%/number) Ethnicity (white (%), African‐american (%), Asian (%), Hispanic (%), other (%)) Country Comorbidity (type %) Comedication (no/yes) Sociodemographics (e.g. double‐ or single‐parent family, low, middle or upper class) Inclusion criteria Exclusion criteria