. Author manuscript; available in PMC: 2024 Apr 22.

Published in final edited form as: J Rheumatol. 2015 Jan 15;42(3):472–478. doi: 10.3899/jrheum.140965

Table 4.

Mean (SD) changes in syndesmophyte circumferential height over 1 and 2 years in absolute and percentage terms. Values are mean (SD) unless otherwise specified.

Characteristics	Per IDS			Per Patient
	n	Baseline to Yr 1	Baseline to Yr 2	n	Baseline to Yr 1	Baseline to Yr 2
Original unit	132	0.63 (1.32)	1.14 (2.16)	33	2.52 (3.46)	4.57 (5.35)
Percentage^*	81	10.7 (26.1)	17.4 (30.8)	24	10.2 (11.7)	16.1 (14.0)

Percentage change can only be computed for IDS and patients with baseline syndesmophyte measures larger than 0. IDS: intervertebral disc space.