Table 3 Results of statistical analysis of the agreement between the feetme insoles and motion capture system coupled to force platform measurements. Static stability parameters.

Parameters	N	Unit	Mean	Std	Bias	Limits of agreement	Pearson correlation	MAE	MRAE (%)	ICC (2,1)	ICC high	ICC low	r²	P-value TOST	P-value Levene
uCoP AP center	72	cm	-	-	-0.7	[-2.5, 1.2]	0.93	0.9	-	0.90	0.95	0.7	0.86	< 0.001	0.44
uCoP ML center	72	cm	-	-	-0.3	[-1.7, 1.1]	1	0.6	-	1	1	0.99	0.99	< 0.001	0.22
uCoP AP dim	72	cm	2.31	0.78	0.0	[-0.8, 0.7]	0.90	0.3	12	0.90	0.93	0.83	0.81	< 0.001	0.39
uCoP ML dim	72	cm	0.93	0.25	-0.1	[-0.5, 0.2]	0.81	0.2	20	0.73	0.86	0.43	0.66	< 0.001	0.09
bCoP AP center	36	cm	-	-	-0.5	[-1.6, 0.7]	0.76	0.6	-	0.64	0.84	0.2	0.58	< 0.001	0.15
bCoP ML center	36	cm	-	-	-0.7	[-2.1, 0.8]	0.95	0.8	-	0.91	0.97	0.61	0.90	< 0.001	0.52
bCoP AP dim	36	cm	1.41	0.48	0.0	[-0.5, 0.4]	0.89	0.2	13	0.89	0.94	0.79	0.79	< 0.001	0.74
bCoP ML dim	36	cm	2.17	0.64	0.0	[-0.6, 0.5]	0.92	0.2	10	0.91	0.95	0.83	0.84	< 0.001	0.52
bCoP area	36	cm²	1.32	-0.13	-0.1	[-1.0, 0.8]	0.94	0.4	16	0.94	0.97	0.88	0.74	< 0.001	0.84
Weight by side	72	kg	38.42	10.18	4.4	[-7.2, 15.9]	0.86	5.6	15	0.79	0.9	0.46	0.78	< 0.001	0.28
Total weight	36	kg	76.85	19.27	8.7	[-10.8, 28.2]	0.88	10.5	14	0.81	0.93	0.36	0.88	< 0.001	0.30
Weight ratio	36	%	50.0	3.97	-1	[-8, 7]	0.67	2.9	6	0.65	0.8	0.41	0.45	< 0.001	0.35
Asymmetry	36	%	0.0	7.9	-2	[-16, 13]	0.67	5.7	-	0.65	0.8	0.41	0.45	< 0.001	0.35

Abbreviations: AP = anterior-posterior direction; bCoP = bilateral center of pressure; ICC (2,1) = intraclass correlation coefficient (two-way random effects, absolute agreement, single rater/measurement); MAE = mean absolute difference; ML = medial-lateral direction; MRAE = mean relative absolute difference; N = number of measurements for each parameter; r²⁼ coefficient of determination; Std = standard deviation; TOST = two one-sided t tests; uCoP = unilateral center of pressure.

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