title: Development and validation of Cedars-Sinai Health-Related Quality of Life in Rheumatoid Arthritis (CSHQ-RA) short form instrument.
abstract: OBJECTIVE
  To develop an abridged version of the 33-item Cedars-Sinai Health-Related Quality of Life in Rheumatoid Arthritis instrument (CSHQ-RA) and test the validity and reliability of the abridged instrument.
  
  
  METHODS
  Items from the original 33-item, 5-domain CSHQ-RA were assessed using psychometric and regression analyses of survey responses from 274 patients with rheumatoid arthritis. Items were retained in the final instrument based on statistical analysis and evaluation by an expert panel. Test-retest reliability, internal consistency, convergent and discriminant validity, and ceiling and floor effects were examined for the shortened CSHQ-RA.
  
  
  RESULTS
  Statistical analysis and expert assessment yielded an 11-item instrument including questions in 4 domains. Test-retest reliability and internal consistency were high and the instrument showed good convergent and discriminant validity.
  
  
  CONCLUSIONS
  The abridged CSHQ-RA short form is a valid and reliable instrument that can be used to examine the impact of RA on patients' health-related quality of life. Prospective validation in clinical trial settings is warranted.
authors.affiliation: Zynx Health, Beverly Hills, California 90212, USA. cchiou@cerner.com
authors.forename: Chiun-Fang
authors.initials: CF
authors.lastname: Chiou
authors.forename: Cathy D
authors.initials: CD
authors.lastname: Sherbourne
authors.forename: Joshua
authors.initials: J
authors.lastname: Ofman
authors.forename: Martin
authors.initials: M
authors.lastname: Lee
authors.forename: Deborah P
authors.initials: DP
authors.lastname: Lubeck
authors.forename: Harold E
authors.initials: HE
authors.lastname: Paulus
authors.forename: Michael
authors.initials: M
authors.lastname: Weisman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000503:physiopathology* / Q000523:psychology*; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D011788:Quality of Life; D012044:Regression Analysis; D015203:Reproducibility of Results; D018434:Sickness Impact Profile