title: The self-report Barthel Index: preliminary validation in people with Parkinson's disease.
abstract: OBJECTIVE
  To make a preliminary assessment of the reliability and validity of the self-report Barthel Index (SRBI) in people with Parkinson's (PWP) disease.
  
  
  METHODS
  Thirty-nine PWP completed the SRBI, the self-report Schwab & England (S & E) scale and the PDQ-39. Standard statistical procedures were incorporated to assess the reliability and validity of the SRBI.
  
  
  RESULTS
  A Cronbach's alpha coefficient of 0.69 was calculated, indicating adequate internal consistency. Reliability was further demonstrated through a Guttman split-half reliability coefficient of 0.74. Validity was demonstrated through highly significant correlations between the SRBI and the S & E scale (r = 0.64, P < 0.00), the activities of daily living dimension of the PDQ-39 (r = -0.60, P < 0.00) and mobility dimension of the PDQ-39 (r = -0.49, P < 0.01).
  
  
  CONCLUSIONS
  Results suggest that the SRBI has the potential to be a reliable and valid indicator of ADL in PWP and utilized in studies that make comparisons across conditions. Further validation is required in a larger sample and through assessment of additional psychometric properties.
authors: Department of Public Health, University of Oxford, Oxford, UK. david.morley@dph.ox.ac.uk
authors: D
authors: D
authors: Morley
authors: C
authors: C
authors: Selai
authors: A
authors: A
authors: Thompson
mesh_terms: D000328:Adult; D000368:Aged; D055109:Ankle Brachial Index; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000175:diagnosis* / Q000523:psychology; D015203:Reproducibility of Results; D057566:Self Report