Langevin 2012.

Methods	A controlled before‐after study of methylphenidate use for ADHD
Participants	Number of participants screened: not stated Number of participants included: 10 Number of participants included as cases: 5 and controls: 5 Number of participants followed up: 10 Number of withdrawals: 0 Diagnosis of ADHD: DSM‐IV TM (subtype: combined (80%); inattentive (20%)) Age: mean 8.13 years (range 7‐9) IQ: normal Sex: 8 males, 2 females Methylphenidate‐naïve: not stated Ethnicity: white (90%), African‐Canadian (10%) Country: Canada Comorbidity: 20% ODD, 10% seasonal affective disorder Comedication: not stated Sociodemographics: not stated
Interventions	Methylphenidate type: immediate‐release or moderate‐release Methylphenidate dosage: not stated Administration schedule: not stated Duration of intervention: 6 months Treatment compliance: not stated
Outcomes	Non‐serious adverse events: Sleep quality and numbers of hours of sleep
Notes	Sample calculation: not stated Ethics approval: not stated Funding/vested interests/authors' affiliations: this study was supported by a grant from the University of Alberta (Killam Research Fund) Key conclusions of the study authors: the principal results support the study's hypothesis and show a significant baseline difference (P = 0.008) between the nocturnal movements of the ADHD children and those of the control children Exclusion of methylphenidate non‐responders/children who have previously experienced adverse events on methylphenidate: no