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. 2017 Jul 6;76(11):1823–1828. doi: 10.1136/annrheumdis-2017-211596

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Effect of inflammation on MRI-SIJ on being mNY-positive after 5 years irrespective of baseline mNY status stratified according to the HLA-B27 status at baseline (1-level binomial multivariable GEE). Interaction between inflammation on MRI-SIJ and HLA-B27 at baseline: p=0.033. BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; CRP, creactive protein; GEE, generalised estimating equations; mNY, modified New York criteria; MRI-SIJ, magnetic resonance imaging of the sacroiliac joints; NSAIDs, non-steroidal anti-inflammatory drugs.