title: Randomised controlled trials in overweight children: practicalities and realities.
abstract: OBJECTIVE
  To highlight and discuss the practical aspects of conducting high quality, randomised controlled trials (RCTs) with overweight and obese children and their families.
  
  
  BACKGROUND
  Realistic considerations and suggestions for researchers arising from the experiences of three Australian interventions in overweight/obese children are highlighted. The practical implications of key issues arising during this type of RCT include study design, obtaining ethical approval, choice of outcome measures, recruitment, working with families, impact and process evaluation, retention strategies, managing multi-site trials and data management.
  
  
  CONCLUSIONS
  Interventions for overweight children and their families are challenging. Although there were some differences in the design and outcome measures among the three studies, there were many similarities. Multi-site trials, although more expensive than single-site trials, are advantageous in increasing sample size and external validity. Collectively we have developed strategies to address key problems in conducting RCTs, including the common challenges of recruitment, retention and working with families.
authors.affiliation: University of Newcastle, Schools of Health Sciences and Education, Callaghan Campus, Newcastle, New South Wales, Australia. j.warren@uq.edu.au
authors.forename: Janet M
authors.initials: JM
authors.lastname: Warren
authors.forename: Rebecca K
authors.initials: RK
authors.lastname: Golley
authors.forename: Clare E
authors.initials: CE
authors.lastname: Collins
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Okely
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Jones
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Morgan
authors.forename: Rebecca A
authors.initials: RA
authors.lastname: Perry
authors.forename: Louise A
authors.initials: LA
authors.lastname: Baur
authors.forename: Julie R
authors.initials: JR
authors.lastname: Steele
authors.forename: Anthea M
authors.initials: AM
authors.lastname: Magarey
mesh_terms: D001315:Australia; D002648:Child; D002675:Child, Preschool; D005195:Family Relations; D005260:Female; D006801:Humans; D008297:Male; D015337:Multicenter Studies as Topic; D009765:Obesity / Q000628:therapy; D017063:Outcome Assessment, Health Care; D050177:Overweight; D010358:Patient Participation; D018579:Patient Selection; D010372:Pediatrics; D016032:Randomized Controlled Trials as Topic / Q000191:economics / Q000941:ethics / Q000379:methods*; D012107:Research Design; D018401:Sample Size