title: The brachial plexus outcome measure: development, internal consistency, and construct validity.
abstract: OBJECTIVE
  The purpose of this article was to report the development of a new assessment tool, the Brachial Plexus Outcome Measure (BPOM) and the evaluation of its internal consistency and construct validity.
  
  
  METHODS
  A retrospective case series of children aged 4-19 years with obstetrical brachial plexus palsy (OBPP) was conducted. Intraclass coefficients were calculated for the BPOM Activity Scale items. Correlation between the Active Movement Scale (AMS) and BPOM Activity Scale scores were conducted to determine the convergent validity.
  
  
  RESULTS
  The BPOM Activity Scale items (N=306) had good internal consistency (Cronbach's α=0.87). A strong correlation between the BPOM Activity Scale and AMS (n=284) was found (r=0.71, p=0.001, α=0.05).
  
  
  CONCLUSIONS
  The BPOM Activity Scale demonstrates good internal consistency and construct validity as a discriminative functional outcome measure in children with OBPP.
  
  
  METHODS
  IV.
authors: Division of Plastic and Reconstructive Surgery, Department of Rehabilitation Services, The Hospital for Sick Children, University of Toronto, Ontario, Canada. emily.ho@sickkids.ca
authors: Emily S
authors: ES
authors: Ho
authors: Christine G
authors: CG
authors: Curtis
authors: Howard M
authors: HM
authors: Clarke
mesh_terms: D000293:Adolescent; D001720:Birth Injuries / Q000150:complications; D020516:Brachial Plexus Neuropathies / Q000209:etiology / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D011594:Psychometrics; D012189:Retrospective Studies; D055815:Young Adult