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Proportion of patients achieving A, major improvement in the Ankylosing Spondylitis Disease Activity Score (ASDAS‐MI) and B, 40% improvement in disease activity according to the Assessment of SpondyloArthritis international Society criteria (ASAS40) by week 52. P < 0.0001 for certolizumab pegol (CZP) versus placebo (PBO) at week 12 and week 52 for both ASDAS‐MI and ASAS40. NBBM = nonbiologic background medication.
