Validation of the six-minute walking distance measured by FeetMe® insoles

BMC Digital Health

Table 2 Analysis of the accuracy and of the agreement of the distances estimated by FeetMe® and the rater along the 30-m and 10-m tracks

Method	n	Track length [m]	Bias [m]	95% CI of differences [m]	R²	Pearson correlation	ICC	95% CI of ICC	MAE [m]	t-test p-value*
FeetMe®	32	30	-8.30	[-31.01–14.41]	0.96	0.98	0.97	[0.90–0.99]	9.75	0.002
Rater	33	30	-16.24	[32.47–0.01]	0.99	0.99	0.95	[0.12–0.99]	16.24	0.002
FeetMe®	32	10	-9.00	[-36.93–18.93]	0.95	0.97	0.96	[0.86–0.98]	12.86	< 0.001
Rater	33	10	-37.73	[-79.57–4.11]	0.86	0.93	0.76	[0–0.93]	38.88	< 0.001

Abbreviations: ICC intraclass correlation coefficient, CI confidence interval, MAE mean absolute error, R² coefficient of determination
^*t-test p-values were obtained for comparisons of the absolute errors between FeetMe® estimates and rater estimates

ISSN: 2731-684X