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Bland and Altman plots: reliability of the mSASSS and RASSS progression scores. Difference against mean for mSASSS and RASSS progression scores of the two readers. The SDC for the progression scores was 2.9 for the mSASSS and 3.5 for the RASSS. mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; RASSS, Radiographic Ankylosing Spondylitis Spinal Score; SDC, smallest detectable change.
