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Table 4 Community based test-retest reliability for AX3 wearable system micro and 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

Variables Median (IQR) Agreement
  Week 1 Week 2 Median difference (%) ICC LoA % (95% LoA) r
Macro characteristics
 Total daily step count 7825 (6428) 7191 (5920) −634 (−9%) 0.917** 0.9 (3138, −4470) 0.892**
 Mean walking bout length (s) 17.12 (2.56) 16.3 (6.2) −0.82 (−5%) 0.919** 0.4 (3.036, −3.565) 0.894**
 Total number of daily walking bouts 535 (288) 462 (237) −73 (16) 0.867** 2 (226,-272) 0.823**
 Alpha (unit less) 1.614 (0.535) 1.615 (0.068) 0.001 (0.06) 0.948** 0.1 (0.05, −0.046) 0.853**
 Variability (s) 0.840 (0.057) 0.842 (0.105) 0.002 (0.2%) 0.887** 0.2 (0.08, −0.094) 0.801**
Micro characteristics
Mean
 Step velocity (m/s) 1.05 (0.165) 1.07 (0.152) 0.02 (1.9) 0.958** 0.17 (0.087, −0.093) 0.914**
 Step length (m) 0.610 (0.085) 0.610 (0.085) 0 (0) 0.969** 1.2 (0.034, −0.038) 0.940**
 Step time (s) 0.613 (0.353) 0.622 (0.38) 0.009 (1) 0.951** 0.07(0.022, −0.018) 0.889**
 Swing time (s) 0.474 (0.032) 0.475 (0.030) 0.001 (0.2) 0.962** 0.07 (0.02,-0.013) 0.925**
 Stance time (s) 0.764 (0.040) 0.766 (0.047) 0.002 (0.2) 0.942** 0.1 (0.026, −0.026 0.863**
Variability
 Step velocity (m/s) 0.385 (0.048) 0.383 (0.042) −0.002 (−0.5) 0.905** 0.2 (0.04, −0.0345) 0.914**
 Step length (m) 0.162 (0.021) 0.159 (0.017) 0.003 (−2%) 0.944** 0.12 (0.034, −0.0384) 0.940**
 Step time (s) 0.183 (0.041) 0.181 (0.044) −0.002 (−1) 0.982** 0.17 (0.018, −0.0149) 0.889**
 Swing time (s) 0.152 (0.040) 0.150 (0.039) −0.002 (−1.3) 0.983** 0.15 (0.0119,-0.0113) 0.925**
 Stance time (s) 0.193 (0.042) 0.193 (0.044) 0 (0) 0.982** 0.2 (0.0189, −0.0169) 0.863**
Asymmetry
 Step length (m) 0.082 (0.019) 0.090 (0.021) 0.008 (9%) 0.668** 0.7 (0.0337, −0.0245) 0.599**
 Step time (s) 0.123 (0.037) 0.120 (0.044) −0.003 (−2.5) 0.875** 0.6 (0.0357, −0.0344) 0.788**
 Swing time (s) 0.109 (0.040) 0.101 (0.049) −0.008 (−8%) 0.925** 0.5 (0.026, −0.0261) 0.850**
 Stance time (s) 0.123 (0.04) 0.109 (0.030) −0.01 (−13%) 0.878** 0.6 (0.0357, −0.0398) 0.742**
  1. IQR Interquartile range, s seconds, 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