Table 3.

Laboratory based test-retest reliability (1 week apart) for AX3 wearable system micro gait measurement

Variable	Median (IQR)		Correlations/agreements
	Time point 1	Time point 2	Median difference (%)	ICC	LoA % (95% LoA)	r
Mean
Step velocity (m/s)	1.08 (0.40)	1.08 (0.345)	0 (0%)	0.534*	1.0 (0.34, −0.30)	0.547**
Step length (m)	0.657 (0.113)	0.642 (0.140)	−0.015 (−2%)	0.419	1.0 (0.31, −0.32)	0.572**
Step time (s)	0.600 (0.130)	0.601 (0.123)	−0.001(0.2%)	0.844**	1.0 (0.28, −0.3)	0.941**
Swing time (s)	0.485 (0.174)	0.467 (0.117)	−0.018 (−4%)	0.858**	1.0 (0.24, −0.28)	0.926**
Stance time (s)	0.743 (0.136)	0.740 (0.130)	−0.003 (−0.4%)	0.819**	0.78 (0.32, −0.34)	0.930**
Variability
Step velocity (m/s)	0.150 (0.053)	0.162 (0.130)	0.012 (7%)	0.343	3.7 (0.33, −0.26)	0.427*
Step length (m)	0.082 (0.077)	0.123 (0.131)	0.041 (33%)	0.632**	2.8 (0.21, −0.13)	0.693**
Step time (s)	0.056 (0.097)	0.082 (0.208)	0.026 (32%)	0.777**	4.17 (0.36, −0.24)	0.886**
Swing time (s)	0.063 (0.098)	0.082 (0.168)	0.019 (23%)	0.793**	4.1(0.33, −0.23)	0.901**
Stance time (s)	0.062 (0.104)	0.087 (0.195)	0.025 (29%)	0.784**	4 (0.36, −0.24)	0.909**
Asymmetry
Step length (m)	0.084 (0.216)	0.106 (0.125)	0.022 (21%)	−0.194	5.1 (0.36, −0.32)	0.015
Step time (s)	0.045 (0.085)	0.036 (0.077)	0.009 (25%)	0.813**	3.6 (0.14, −0.12)	0.628**
Swing time (s)	0.044 (0.077)	0.035 (0.082)	−0.009 (26%)	0.857**	3.3 (0.12, −0.10)	0.545**
Stance time (s)	0.045 (0.087)	0.042 (0.075)	−0.003 (7%)	0.857**	3.2 (0.11, −0.11)	0.525**

T1 Time point 1, T2 Time point 2, IQR Interquartile range, ICC Intraclass correlation coefficient, LoA% limits of agreement as a percentage of the mean of the two systems, r Spearman’s rank correlation coefficient

**p ≤ 0.01 *p ≤ 0.05