title: Validity and responsiveness of a self-administered foot evaluation questionnaire in rheumatoid arthritis.
abstract: OBJECTIVE
  A self-administered foot evaluation questionnaire (SAFE-Q) was developed by the Japanese Society for Surgery of the Foot (JSSF). The aim of this study is to evaluate the validity and responsiveness of the SAFE-Q in patients with rheumatoid arthritis (RA).
  
  
  METHODS
  In total, 180 patients with RA answered the SAFE-Q. Of 180 patients, 34 answered the SAFE-Q twice, preoperatively and postoperatively, to assess responsiveness. Construct validity was tested by comparing the 5 SAFE-Q subscales and the JSSF standard rating system for the RA foot and ankle scale (JSSF-RA), a Japanese version of the Health Assessment Questionnaire (JHAQ), disease activity score in 28 joints (DAS28), simplified disease activity index (SDAI), and clinical disease activity index (CDAI). Responsiveness was examined by calculating the standardized response mean (SRM) and effect size (ES) 3 months after surgery.
  
  
  RESULTS
  There were moderate correlations between the SAFE-Q and the JSSF-RA and JHAQ. Conversely, a low correlation was observed between the SAFE-Q and DAS28, SDAI, and CDAI. The responsiveness was high, with an SRM of 0.9 and ES of 0.7 for pain subscales.
  
  
  CONCLUSIONS
  SAFE-Q is a useful tool for assessing the foot and ankle in RA patients.
authors.affiliation: Department of Orthopedic Surgery, Institute of Rheumatology, Tokyo Women's Medical University , Shinjuku, Tokyo , Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Yano
authors.forename: Katsunori
authors.initials: K
authors.lastname: Ikari
authors.forename: Kensuke
authors.initials: K
authors.lastname: Ochi
authors.forename: Osamu
authors.initials: O
authors.lastname: Ishida
authors.forename: Yu
authors.initials: Y
authors.lastname: Sakuma
authors.forename: Shinji
authors.initials: S
authors.lastname: Yoshida
authors.forename: Takuma
authors.initials: T
authors.lastname: Koyama
authors.forename: Naoko
authors.initials: N
authors.lastname: Koenuma
authors.forename: Shigeki
authors.initials: S
authors.lastname: Momohara
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000503:physiopathology*; D004185:Disability Evaluation; D005260:Female; D005528:Foot / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000175:diagnosis* / Q000503:physiopathology; D010147:Pain Measurement; D011788:Quality of Life; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires
keywords: Responsiveness; Rheumatoid arthritis; SAFE-Q; Validity