RT Journal Article SR Electronic T1 Performance of the Assessment in Spondyloarthritis International Society Classification for Axial and Peripheral Spondyloarthritis in an Established Clinical Cohort: Comparison with Criteria Sets of Amor and the European Spondylarthropathy Study Group JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP jrheum.111088 DO 10.3899/jrheum.111088 A1 Peter P. Cheung A1 Simon Paternotte A1 Vincent Burki A1 Anne Durnez A1 Muriel Elhai A1 Isabelle Fabreguet A1 Eugenie Koumakis A1 Magali Meyer A1 Judith Payet A1 Fanny Roure A1 Maxime Dougados A1 Laure Gossec YR 2012 UL http://www.jrheum.org/content/early/2012/02/10/jrheum.111088.abstract AB Objective To evaluate the performance of the Assessment in Spondyloarthritis International Society (ASAS) criteria (axial or peripheral) against the Amor and European Spondylarthropathy Study Group criteria in established spondyloarthritis (SpA). Methods Rheumatologist-diagnosed patients with SpA were retrospectively classified according to the different criteria sets. Clinical characteristics of patients fulfilling all 3 criteria were compared with those who did not, by nonparametric statistics. Results ASAS classified 90% of the 231 patients, with 169 (73%) fulfilling all 3 criteria sets. Multivariate analysis showed the 62 patients not fulfilling all criteria sets were older at symptom onset (p < 0.001) and less likely to have inflammatory back pain (p < 0.001), peripheral arthritis (p < 0.001), or elevated C-reactive protein levels (p = 0.034). Conclusion ASAS criteria can be used in established disease.