Table 3.

Intra-class correlation coefficients (ICC) with a 95% confidence interval (CI), standard error of the measurement (SEM), and minimum detectable change (MDC) for the investigated gait metrics.

Domains	ICC	95% CI		SEM	MDC
		Lower	Upper
Rhythm [s]
Stride duration	0.97	0.90	0.99	0.04	0.10
Step duration	0.97	0.90	0.99	0.02	0.05
Stance duration	0.96	0.86	0.99	0.03	0.09
Swing duration	0.97	0.91	0.99	0.01	0.03
Variability [ms]
Stride duration	0.92	0.73	0.97	8	21
Step duration	0.92	0.74	0.98	5	13
Stance duration	0.94	0.80	0.98	6	18
Swing duration	0.95	0.85	0.99	4	11
Asymmetry [ms]
Stride duration	0.72	0.13	0.91	1	4
Step duration	0.98	0.93	0.99	10	29
Stance duration	0.90	0.67	0.97	12	33
Swing duration	0.89	0.62	0.97	13	36
Intensity [m/s2]
Antero-Posterior	0.97	0.90	0.99	0.06	0.16
Medio-Lateral	0.98	0.93	0.99	0.04	0.11
Vertical	0.97	0.92	0.99	0.10	0.29
Stability [–]
Antero-Posterior	0.93	0.78	0.98	0.02	0.05
Medio-Lateral	0.93	0.76	0.98	0.03	0.08
Vertical	0.91	0.69	0.97	0.03	0.09
Smoothness [m/s3]
Antero-Posterior	0.92	0.73	0.97	2.46	6.83
Medio-Lateral	0.93	0.79	0.98	1.55	4.29
Vertical	0.95	0.82	0.98	2.31	6.41
Symmetry (HR) [–]
Antero-Posterior	0.95	0.85	0.99	0.14	0.38
Medio-Lateral	0.75	0.15	0.92	0.04	0.10
Vertical	0.92	0.74	0.98	0.21	0.59
Regularity [–]
Step regularity
Antero-Posterior	0.91	0.70	0.97	0.07	0.19
Medio-Lateral	0.86	0.52	0.96	0.04	0.11
Vertical	0.97	0.92	0.99	0.04	0.10
Stride regularity
Antero-Posterior	0.88	0.64	0.96	0.05	0.13
Medio-Lateral	0.85	0.50	0.96	0.04	0.10
Vertical	0.93	0.77	0.98	0.04	0.10
Regularity index
Antero-Posterior	0.76	0.17	0.93	0.17	0.47
Medio-Lateral	0.88	0.62	0.96	0.06	0.17
Vertical	0.89	0.63	0.97	0.09	0.24

Inertial measurement unit (IMU)-based gait metrics with poor to fair test-retest reliability are presented in bold.