title: Concurrent validity of the Health Assessment Questionnaire Disability Index in Scleroderma.
abstract: OBJECTIVE
  To establish the concurrent validity of the Health Assessment Questionnaire (HAQ) Disability Index in systemic sclerosis (SSc; scleroderma).
  
  
  METHODS
  Eighty subjects with SSc completed the HAQ Disability Index questionnaire. An occupational therapist, who was blind to the subjects' responses, observed each subject's performance on 10 of the items.
  
  
  RESULTS
  Paired t-tests showed significant differences between the observer and subjects' responses for tying shoes, buttoning, gripping, and walking. Intra-class correlations between observer and subjects ranged from 0.38 to 0.76.
  
  
  CONCLUSIONS
  The results support the validity of the HAQ Disability Index in patients with systemic sclerosis.
authors.forename: J L
authors.initials: JL
authors.lastname: Poole
authors.forename: C A
authors.initials: CA
authors.lastname: Williams
authors.forename: D A
authors.initials: DA
authors.lastname: Bloch
authors.forename: B
authors.initials: B
authors.lastname: Hollak
authors.forename: P
authors.initials: P
authors.lastname: Spitz
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D006233:Persons with Disabilities; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D026741:Physical Therapy Modalities; D015203:Reproducibility of Results; D012595:Scleroderma, Systemic / Q000503:physiopathology*; D012720:Severity of Illness Index; D016037:Single-Blind Method; D011795:Surveys and Questionnaires