title: Ankylosing spondylitis: an Australian experience.
abstract: BACKGROUND
  The purpose of this study was to characterize an Australian cohort of ankylosing spondylitis (AS) patients and examine predictors of important disease outcomes.
  
  
  METHODS
  Cross-sectional study of first visit data among patients referred to the Austin Spondylitis Clinic from rheumatology or general practices. We obtained clinical and laboratory data and validated composite indices through self-reported questionnaire.
  
  
  RESULTS
  Delay in AS diagnosis averaged 8.1 years and was higher among women and younger-onset disease. Cervicothoracic mobility was better in women although they showed more entheseal tender points and greater impairment of quality of life. Those with long-standing AS had similar disease activity to recent onset disease but had greater functional disability. Current smoking was associated with worse outcomes although there was no association between cumulative exposure and AS outcomes.
  
  
  CONCLUSIONS
  The clinical expression of AS in this first-described Australian cohort is similar to previously described cohorts. We observed greater cervicothoracic mobility and a higher enthesitis index among women perhaps contributing to longer delay to diagnosis.
authors.affiliation: Department of Rheumatology, Royal Perth Hospital, Perth, Western Australia, Australia.
authors.forename: M D
authors.initials: MD
authors.lastname: Reed
authors.forename: S
authors.initials: S
authors.lastname: Dharmage
authors.forename: A
authors.initials: A
authors.lastname: Boers
authors.forename: B J
authors.initials: BJ
authors.lastname: Martin
authors.forename: R R
authors.initials: RR
authors.lastname: Buchanan
authors.forename: L
authors.initials: L
authors.lastname: Schachna
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D001315:Australia / Q000453:epidemiology; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013167:Spondylitis, Ankylosing / Q000175:diagnosis* / Q000453:epidemiology* / Q000628:therapy; D011795:Surveys and Questionnaires