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. 2018 Nov 29;13(11):e0208120. doi: 10.1371/journal.pone.0208120

Table 1. Pearson’s correlation coefficients (r) between UCM measures and the walking stability measures.

Stability measures UCM measures All Healthy Stroke
r p-value r p-value r p-value
Short-term LDE VUCM 0.61 < 0.001 0.09 0.62 0.34 0.04
VORT 0.16 0.18 0.02 0.89 0.06 0.75
ΔV 0.48 < 0.001 0.12 0.49 0.31 0.07
VTOT 0.59 < 0.001 0.08 0.63 0.32 0.06
maxFM VUCM 0.36 0.002 0.02 0.92 0.32 0.06
VORT 0.36 0.002 0.58 < 0.001 0.09 0.59
ΔV 0.001 0.99 -0.48 0.003 0.14 0.41
VTOT 0.37 0.001 0.09 0.60 0.30 0.07
meanSD C7 position VUCM 0.68 < 0.001 0.14 0.40 0.58 < 0.001
VORT 0.41 < 0.001 0.58 < 0.001 0.32 0.06
ΔV 0.24 0.04 -0.47 0.004 0.07 0.67
VTOT 0.68 < 0.001 0.21 0.22 0.57 < 0.001
meanSD C7 velocity VUCM 0.60 < 0.001 0.10 0.58 0.56 < 0.001
VORT 0.12 0.33 -0.12 0.50 0.12 0.50
ΔV 0.39 < 0.001 0.01 0.94 0.34 0.04
VTOT 0.58 < 0.001 0.08 0.66 0.53 < 0.001
mean MOSML VUCM 0.33 < 0.001 0.29 0.09 0.03 0.80
VORT -0.06 0.56 -0.16 0.36 -0.18 0.13
ΔV 0.39 < 0.001 0.20 0.24 0.24 0.05
VTOT 0.30 0.001 0.25 0.14 0.01 0.96
STD MOSML VUCM 0.74 < 0.001 0.60 < 0.001 0.66 < 0.001
VORT 0.42 < 0.001 0.48 0.004 0.40 0.001
ΔV 0.20 0.03 0.01 0.97 -0.06 0.64
VTOT 0.74 < 0.001 0.63 < 0.001 0.65 < 0.001
mean step width VUCM 0.42 < 0.001 -0.19 0.26 0.18 0.15
VORT 0.23 0.01 0.22 0.19 0.18 0.14
ΔV 0.17 0.07 -0.49 0.002 -0.08 0.48
VTOT 0.42 < 0.001 -0.16 0.37 0.18 0.12
STD step width VUCM 0.54 < 0.001 0.40 0.02 0.63 < 0.001
VORT 0.79 < 0.001 0.90 < 0.001 0.74 < 0.001
ΔV -0.39 < 0.001 -0.55 < 0.001 -0.48 < 0.001
VTOT 0.59 < 0.001 0.50 0.002 0.67 < 0.001

Note that a larger value of short-term LDE or maxFM indicates greater instability of the trunk motion represented by the C7 vertebral marker velocity profile in the mediolateral direction.

Short-term LDE: short-term local divergence exponent; maxFM: maximum Floquet multipliers; meanSD C7 position and meanSD C7 velocity: the mean variability of C7 marker positions and velocities across the gait cycle in the mediolateral direction; mean and STD MOSML: mean and variability of the dynamic margins of stability in the mediolateral direction; mean and STD step width: mean and variability of step width