title: The validity, reliability and responsiveness of the Nottingham Extended Activities of Daily Living scale in patients undergoing total hip replacement.
abstract: OBJECTIVE
  The Nottingham Extended Activities of Daily Living (EADL) scale is a popular outcome measure in stroke research. Its psychometric properties have not been tested in other conditions.
  
  
  METHODS
  EADL has been measured before, three and six months after hip arthroplasty. A sample was retested for reliability. Comparisons were made with the SF-36 and London Handicap Scale. Standard psychometric parameters were calculated.
  
  
  RESULTS
  The sub-scales and total score were approximately unidimensional on factor analysis and Cronbach's alpha, but did not form an adequate hierarchical (Guttmann) scale. Associations with other scales were in the expected direction and of approximately the expected strength, supporting concurrent and construct validity. Reliability was good. Responsiveness was poor compared with the other scales.
  
  
  CONCLUSIONS
  The EADL is valid in patients with arthritis of the hip, and is reliable. However, it underestimates the size of health gain after hip arthroplasty compared with other scales.
authors.affiliation: Department of Health Care of the Elderly, University Hospital, Nottingham, UK. rowan.harwood@ntlworld.com
authors.forename: R H
authors.initials: RH
authors.lastname: Harwood
authors.forename: S
authors.initials: S
authors.lastname: Ebrahim
mesh_terms: D000203:Activities of Daily Living / Q000145:classification*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000534:rehabilitation*; D005163:Factor Analysis, Statistical; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D020127:Recovery of Function; D015203:Reproducibility of Results; D020377:Self Efficacy