Skip to main content

Table 1 Baseline characteristics

From: The performance of different classification criteria sets for spondyloarthritis in the worldwide ASAS-COMOSPA study

  Total patients (n = 3942) Based on available data Number of patients with missing items
Age at inclusion, years, mean ± SD 43.6 (13.9)   0
Male sex, n (%) 2563 (65.0%)   0
HLA-B27-positive, n (%) 2217 (56.2%) 72.0% 882
IBP, n (%) 3219 (81.7%)   52
Morning stiffness, n (%) 2497 (63.3%)   22
Enthesitis, n (%) 1354 (34.3%)   0
Dactylitis, n (%) 610 (15.5%)   3
Psoriasis, n (%) 843 (21.4%)   0
Uveitis, n (%) 771 (19.6%)   0
Peripheral arthritis, n (%) 2424 (61.5%)   0
IBD, n (%) 209 (5.3%)   0
Positive family history, n (%) 1475 (37.4%)   117
Good response to NSAIDs, n (%) 2433 (61.7%) 77.5% 803
Elevated CRP, n (%) 2109 (53.5%) 57.7% 287
Preceding infection, n (%) 271 (6.9%)   74
Sacroiliitis based on radiograph (mNY), n (%) 2539 (64.4%) 70.0% 341
Sacroiliitis based on MRI, n (%) 1326 (33.6%) 65.7% 1951
Rheumatoid factor-negative, n (%) 3177 (80.6%) 94.8% 613
Psoriatic nail dystrophy, n (%) 460 (11.7%)   28
Juxta-articular bone formation, n (%) 526 (13.3%) 17.7% 999
  1. Abbreviations: IBP Inflammatory back pain according to Assessment of SpondyloArthritis international Society definition (reference), IBD Inflammatory bowel disease, CRP C-reactive protein, ESR Erythrocyte sedimentation rate, HLA-B27 Human leucocyte antigen, mNY Modified New York criteria, NSAID Non-steroidal anti-inflammatory drug, MRI Magnetic resonance imaging