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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