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Definition of on-cDMARD intervals and off-cDMARD intervals. The mSASSS values at the beginning and end points in each interval were imputed with a linear interpolation method using the values measured before and after each time point.
cDMARD, conventional disease-modifying antirheumatic drug; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score.
