Table 3 Laboratory based test-retest reliability (1 week apart) for AX3 wearable system micro gait measurement
Variable | Median (IQR) | Correlations/agreements | ||||
|---|---|---|---|---|---|---|
| Â | 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** |