Scoring radiographic progression in ankylosing spondylitis: should we use the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS) or the Radiographic Ankylosing Spondylitis Spinal Score (RASSS)?

Table 3 Feasibility of the mSASSS vs.

	All radiographs (n= 809)*			All radiographs from patients with RASSS available at year 12 (n= 341)*			All baseline radiographs from patients with baseline - year 2 interval available (n= 184)*
	mSASSS	RASSS	% RASSS in radiographs with mSASSS	mSASSS	RASSS	%	mSASSS	RASSS	% RASSS in radiographs with mSASSS
Available status scores (≤ 3 missing VC per segment)	809	629	78%	341	277	81%	184	134	73%
Available 2-year progression intervals	520	330	63%	239	159	67%	164	96	59%

RASSS - availability of the status and progression scores.
*n = number of radiographs. mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; RASSS, radiographic Ankylosing Spondylitis Spinal Score; VC, vertebral corner.

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