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The continuous relationship between C‐reactive protein (CRP) and outcome. The graph of baseline CRP serum levels (mg/L) against the Ankylosing Spondylitis Disease Activity Score‐CRP (ASDAS‐CRP) (A), Ankylosing Spondylitis Disease Activity Score‐Erythrocyte Sedimentation Rate (ASDAS‐ESR) (B), Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) (C), and Spondyloarthritis Research Consortium of Canada (SPARCC) sacroiliac (SIJ) (D) scores.
