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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