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Table 2 Laboratory based agreement between AX3 wearable system, Gait Rite and OPAL for micro gait characteristics

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

Variable AX3 wearable system vs. GaitRite AX3 wearable system vs. OPAL
  ICC r LoA % (95% LoA) ICC r LoA % (95% LoA)
Micro gait characteristics
Mean
 Step velocity (m/s) 0.744** 0.632** 1.1 (0.06, −0.043) 0.923** 0.871** 0.4 (0.19, 0.22)
 Step length (m) −0.411 0.035 1.5 (0.56, −0.35) 0.831** 0.784** 0.6 (0.22, −0.18)
 Step time (s) 0.797** 0.917** 1.1 (0.38, −0.38) 0.890** 0.948** 0.6 (0.25, −0.17)
 Swing time (s) 0.431* 0.558** 1.3 (0.40, −0.21) 0.900** 0.944** 0.8 (0.22, −0.17)
 Stance time (s) 0.758** 0.902** 1.2 (0.50, −0.60) 0.876** 0.871** 0.6 (0.28, −0.17)
Variability
 Step velocity (m/s) 0.052 0.261 3.8 (0.28, −0.05) 0.658** 0.503* 2.1 (0.17, −0.23)
 Step length (m) 0.457** 0.121 2.9 (0.175,-0.036) 0.884** 0.616** 1.6 (0.08, −0.104)
 Step time (s) 0.802** 0.688** 4.5 (0.25, −0.13) 0.972** 0.940** 1.6 (0.09, −0.10)
 Swing time (s) 0.389 0.694** 6.4 (0.33, −0.15) 0.968** 0.928** 1.7 (0.1, −0.11)
 Stance time (s) 0.724** 0.766** 4.3 (0.26, −0.12) 0.974** 0.936** 1.5 (0.09, −0.11)
Asymmetry
 Step length (m) 0.442 0.001 4.5 (0.25, −0.18) 0.464 0.381 3.6 (0.2, −0.22)
 Step time (s) 0.178 0.601** 3.9 (0.49, −0.75) 0.492* 0.558** 4 (0.13, −0.08)
 Swing time (s) 0.320 0.454* 6.7 (0.23, −0.33) 0.539* 0.733** 4.7 (0.13, −0.08)
 Stance time (s) 0.439 0.570** 6 (0.216, −0.30) 0.504* 0.592** 4.9 (0.15, −0.09)
  1. Vs. versus, ICC Intraclass correlation coefficient, r Spearman’s rank correlation coefficient, LoA% limits of agreement as a percentage of the mean of the two systems
  2. **p ≤ 0.01 *p ≤ 0.05