title: Reliability of the Brazilian Portuguese version of the Gross Motor Function Measure in children with cerebral palsy.
abstract: OBJECTIVE
  To test the intra- and interrater reliability of the Brazilian Portuguese version of the 66-item Gross Motor Function Measure (GMFM-66).
  
  
  METHODS
  The sample included 48 children with cerebral palsy (CP), ranging from 2-17 years old, classified at levels I to IV of the Gross Motor Function Classification System (GMFCS) and four child rehabilitation examiners. A main examiner evaluated all children using the GMFM-66 and video-recorded the assessments. The other examiners watched the video recordings and scored them independently for the assessment of interrater reliability. For the intrarater reliability evaluation, the main examiner watched the video recordings one month after the evaluation and re-scored each child. We calculated reliability by using intraclass correlation coefficients (ICC) with their respective 95% confidence intervals.
  
  
  RESULTS
  Excellent test reliability was documented. The intrarater reliability of the total sample was ICC=0.99 (95% CI 0.98-0.99), and the interrater reliability was ICC=0.97 (95% CI 0.95-0.98). The reliability across GMFCS levels ranged from ICC=0.92 (95% CI 0.72-0.98) to ICC=0.99 (95% CI 0.99-0.99); the lowest value was the interrater reliability for the GMFCS IV group. Reliability in the five GMFM dimensions varied from ICC=0.95 (95% CI 0.93-0.97) to ICC=0.99 (95% CI 0.99-0.99).
  
  
  CONCLUSIONS
  The Brazilian Portuguese version of the GMFM-66 showed excellent intra- and interrater reliability when used in Brazilian children with CP levels GMFCS I to IV.
authors.affiliation: Departamento de Educação Integrada em Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.
authors.forename: Kênnea M
authors.initials: KM
authors.lastname: Almeida
authors.affiliation: Departamento de Educação Integrada em Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.
authors.forename: Karolina A
authors.initials: KA
authors.lastname: Albuquerque
authors.affiliation: Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Marina L
authors.initials: ML
authors.lastname: Ferreira
authors.affiliation: Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Stéphany K B
authors.initials: SK
authors.lastname: Aguiar
authors.affiliation: Departamento de Terapia Ocupacional, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Marisa C
authors.initials: MC
authors.lastname: Mancini
mesh_terms: D000293:Adolescent; D001938:Brazil; D002547:Cerebral Palsy / Q000503:physiopathology*; D002648:Child; D004185:Disability Evaluation; D006801:Humans; D009048:Motor Skills / Q000145:classification; D015203:Reproducibility of Results