Table III.

Within-person differences of cartilage thickness (ThCtAB) in the A–P subregions of the medial femoral condyle (MF) for knees with medial joint space narrowing (mJSN) grade 1 (n = 45), grade 2 (n = 21) and grade 3 (n = 7) compared to contra-lateral knees with JSN grade 0

Plate	OARSI mJSN grade	Mean difference [μm]	Mean difference [%]	SD difference [μm]	Z-score	P-value (paired t test)	FDR P-value
0–30°	JSN 1	−100	−5.5	290	−0.3	0.025	0.048
	JSN 2	−440	−24	370	−1.3	<0.001	0.003
	JSN 3	−970	−53	260	−2.9	<0.001	0.003
15–45°	JSN 1	−120	−6.6	280	−0.4	0.006	0.014
	JSN 2	−450	−25	310	−1.4	<0.001	0.003
	JSN 3	−1025	−56	220	−3.2	<0.001	0.003
30–60°	JSN 1	−140	−7.5	290	−0.4	0.003	0.008
	JSN 2	−480	−26	290	−1.5	<0.001	0.003
	JSN 3	−1070	−58	190	−3.3	<0.001	0.003
45–75°	JSN 1	−20	−8.1	320	−0.5	0.002	0.006
	JSN 2	−500	−26	320	−1.5	<0.001	0.003
	JSN 3	−1080	−57	260	−3.2	<0.001	0.003
60–90°	JSN 1	−130	−6.5	300	−0.4	0.008	0.017
	JSN 2	−380	−20	320	−1.2	<0.001	0.003
	JSN 3	−850	−44	420	−2.6	0.002	0.006
75–105°	JSN 1	−60	−2.9	260	−0.2	0.170	0.249
	JSN 2	−200	−11	340	−0.6	0.015	0.030
	JSN 3	−480	−25	550	−1.5	0.062	0.104
90–120°	JSN 1	+10	+0.3	270	+0.0	0.883	0.937
	JSN 2	−50	−2.7	340	−0.2	0.511	0.598
	JSN 3	−240	−13	630	−0.8	0.352	0.476
105–135°	JSN 1	+30	+1.8	290	+0.1	0.431	0.541
	JSN 2	+40	+2.1	290	+0.1	0.543	0.614
	JSN 3	−110	−5.7	680	−0.3	0.695	0.761
120–150°	JSN 1	+30	+1.9	260	+0.1	0.388	0.496
	JSN 2	−10	−0.3	250	−0.0	0.916	0.957
	JSN 3	+20	+0.9	560	+0.1	0.943	0.957

SD difference = standard deviation of the differences between mJSN and no-mJSN knees; Z-score = cartilage thickness difference between JSN and no-JSN knees expressed in number of standard deviations of cartilage thickness in the 73 no-JSN knees [for the A–P subregions please see Fig. 2(c)]; negative values imply a smaller cartilage thickness compared with contra-lateral no-JSN knees.