Table 2.

Responsiveness to Change in JSWx on XR and WBCT over 24 months (SRM, 95% CI; N=344)

JSWx Location	Sample Size	2D JSWx (XR) SRM (95% CI)	3D JSWx (WBCT) SRM (95% CI)	(2D-3D) Mean Difference* (95% CI)	p-value for differences in SRMs*
0.150	341 knees/263 ppts	−0.10 (−0.18, −0.02)	−0.19 (−0.27, −0.10)	0.091 (−0.009, 0.191)	0.074
0.175	343 knees/265 ppts	−0.12 (−0.19, −0.04)	−0.21 (−0.30, −0.12)	0.091 (−0.011, 0.194)	0.080
0.200	344 knees/266 ppts	−0.14 (−0.22, −0.06)	−0.21 (−0.30, −0.13)	0.073 (−0.032, 0.177)	0.174
0.225	344 knees/266 ppts	−0.13 (−0.21, −0.04)	−0.19 (−0.28, −0.10)	0.058 (−0.053, 0.170)	0.306
0.250	342 knees/265 ppts	−0.14 (−0.23, −0.06)	−0.20 (−0.29, −0.10)	0.067 (−0.052, 0.185)	0.271
0.275	340 knees/264 ppts	−0.14 (−0.23, −0.06)	−0.24 (−0.33, −0.16)	0.132 (0.021, 0.244)	0.020
0.300	307 knees/243 ppts	−0.16 (−0.25, −0.08)	−0.18 (−0.27, −0.09)	0.023 (−0.088, 0.135)	0.708
0.750	329 knees/258 ppts	−0.15 (−0.25, −0.06)	0.01 (−0.07, 0.10)	−0.166 (−0.289, −0.043)	0.008

^*A positive mean difference means a greater reduction in 3D than in 2D joint space width, meaning 3D measure is more responsive.