4 The Short Physical Performance Battery does not correlate with daily life gait quality and quantity | 65 correlations between the SPPB and the 90th or 10th percentile of the gait quality measures. Similar as to the 50th percentiles, these correlations were also weak. Table 4.2. The median with interquartile range of the gait quality and quantity values and the correlation between the SPPB scores and gait quality and quantity values. SPPB score, quantity or quality of gait Values Median (IQR) Correlation with SPPB (p-value) SPPB score 10 (8-11) Quantity of gait Mean number of strides per day 2,972 (1,005-4,939) 0.09 (0.199) Mean walking duration per day (hours) 1.16 (0.44-1.88) 0.06 (0.330) Sedentary time (hours) 9.28 (6.65-11.91) 0.14 (0.039) Mean number of locomotion bouts 419 (206-632) 0.06 (0.365) Quality of gait Walking speed mean (m/s) 0.94 (0.62-1.26) 0.16 (0.013) Walking speed variability 0.06 (0.04-0.08) 0.03 (0.649) Stride regularity VT (gait consistency) 0.58 (0.33-0.83) 0.13 (0.043) Stride regularity ML (gait consistency) 0.46 (0.31-0.61) -0.08 (0.257) Harmonic ratio VT (gait symmetry) 2.44 (1.57-3.31) 0.14 (0.035) Harmonic ratio AP (gait symmetry) 1.97 (1.27-2.67) 0.20 (0.003) Root Mean Square ML (gait intensity) 1.21 (0.90-1.52) 0.02 (0.725) Sample entropy VT (gait complexity) 0.23 (0.18-0.28) -0.006 (0.929) Sample entropy ML (gait complexity) 0.33 (0.27-0.39) 0.16 (0.016) Lyapunov exponent (gait stability) 1.47 (1.04-1.90) -0.16 (0.016) Index of harmonicity AP (gait smoothness) 0.71 (0.57-0.85) -0.08 (0.216) Gait quality composite score 0.69 (-0.79-2.17) 0.16 (0.014) Table 4.3. The correlation between the SPPB and the 90th percentile of the gait quality values unless indicated otherwise. Values Correlation with SPPB (p-value) Walking speed mean (m/s) 0.21 (0.001) Walking speed variabilitya 0.13 (0.043) Stride regularity VT (gait consistency) 0.13 (0.043) Stride regularity ML (gait consistency) -0.009 (0.895) Harmonic ratio VT (gait symmetry) 0.23 (<0.001) Harmonic ratio AP (f gait symmetry) 0.14 (0.037) Root Mean Square ML (gait intensity)a 0.02 (0.725) Sample entropy VT (gait complexity) -0.006 (0.929) Sample entropy ML (gait complexity) 0.16 (0.016) Lyapunov exponent (gait stability)a -0.16 (0.016) Index of harmonicity AP (gait smoothness) -0.03 (0.64) Gait quality composite score 0.16 (0.014) a 10th percentile
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