Stimulant-related reductions of growth rates in the PATS

James Swanson, Laurence Greenhill, Tim Wigal, Scott Kollins, Annamarie Stehli, Mark Davies, Shirley Chuang, Benedetto Vitiello, Anne Skrobala, Kelly Posner, Howard Abikoff, Melvin Oatis, James McCracken, James McGough, Mark Riddle, Jaswinder Ghuman, Charles Cunningham, Sharon Wigal

Research output: Contribution to journalArticlepeer-review

154 Scopus citations


OBJECTIVE: To investigate growth of children with attention-deficit/ hyperactivity disorder (ADHD) in the Preschool ADHD Treatment Study (PATS) before and after initiation of treatment with methylphenidate at titrated doses (average, 14.2 mg/day) administered three times daily, 7 days/week for ≈1 year. METHOD: The heights and weights of 140 children with ADHD were measured up to 29 times in the PATS protocol, starting at an average age of 4.4 years. The relationship between standard (z) scores and time on medication was examined using mixed-effect regression to estimate change in relative size (slope). RESULTS: Average relative size at baseline was significantly (p < .0001) greater than zero for z height (+0.45) and z weight (+0.78), indicating greater than expected height (by 2.04 cm) and weight (by 1.78 kg). During treatment, slopes were significantly (p < .0001) less than zero for z height (-0.304/yr) and z weight (-0.530/yr), indicating reduction of growth rates. For 95 children who remained on medication, annual growth rates were 20.3% less than expected for height (5.41 cm/yr - 6.79 cm/yr = -1.38 cm/yr) and 55.2% for weight (1.07 kg/yr - 2.39 kg/yr = -1.32 kg/yr). CONCLUSIONS: Risks of reduced growth rates should be balanced against expected benefits when preschool-age children are treated with stimulant medication. Copyright 2006

Original languageEnglish (US)
Pages (from-to)1304-1313
Number of pages10
JournalJournal of the American Academy of Child and Adolescent Psychiatry
Issue number11
StatePublished - Nov 2006


  • Attention-deficit/hyperactivity disorder
  • Growth
  • Stimulant medication

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Psychiatry and Mental health


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