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Table 3 Laboratory based test-retest reliability (1 week apart) for AX3 wearable system micro gait measurement

From: Comprehensive measurement of stroke gait characteristics with a single accelerometer in the laboratory and community: a feasibility, validity and reliability study

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**
  1. 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
  2. **p ≤ 0.01 *p ≤ 0.05