title: Reliability and validity of measures obtained from stroke patients using the Balance Master.
abstract: OBJECTIVE
  To determine the test-retest reliability and validity of data obtained using the Balance Master (BM), a computerized balance assessment and training tool.
  
  
  METHODS
  Data were collected on three occasions, 1 week apart. Intraclass correlation coefficients (ICCs) were calculated if significant (p < .05) between-subject variance was found using a univariate analysis of variance for repeated measures. Concurrent validity of the BM data was determined using the Berg Balance Scale and gait velocity as criterion standards.
  
  
  METHODS
  Twenty ambulatory hemiparetic subjects who had no history of lower extremity orthopedic problems, no neurological deficits apart from stroke, and had not trained using the BM.
  
  
  METHODS
  BM data relating to static and dynamic balance performance, gait velocity, and the total score from the Berg Balance Scale.
  
  
  RESULTS
  ICCs indicated that only the BM test requiring subjects to shift their center of gravity to randomly highlighted targets (positioned in a circle representing 75% of the individual's limits of stability) was reliable, both in terms of movement path (ICC = .84) and movement time (ICC = .88). Concurrent validity of the BM data was established for the dynamic measures of balance only, which correlated with both the Berg Balance Scale and gait velocity outcomes (r > or = .48, p < .05).
  
  
  CONCLUSIONS
  These findings suggest that in stroke patients the test-retest reliability of data obtained using the BM is greatest for complex tests of balance and that dynamic rather than static balance measures are valid indicators of functional balance performance.
authors.affiliation: School of Rehabilitation, Queen's University, Kingston, Ontario, Canada.
authors.forename: R A
authors.initials: RA
authors.lastname: Liston
authors.forename: B J
authors.initials: BJ
authors.lastname: Brouwer
mesh_terms: D000328:Adult; D000368:Aged; D002561:Cerebrovascular Disorders / Q000503:physiopathology*; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D008875:Middle Aged; D004856:Postural Balance; D012046:Rehabilitation / Q000379:methods; D015203:Reproducibility of Results