The CLASSIC study (n=1015, 27 countries) validated revised ASAS-SPARTAN axSpA criteria. Final model achieved 79.5% sensitivity & 90.4% specificity vs global diagnosis. MRI SIJ (active + structural) was strongest predictor. HLA-B27, CRP, IBD, uveitis also included. Abstract#0854 https://t.co/GjSHE2ihVI