96 Chapter 6 Supplementary materials Supplementary Table 1: Differences between participants with HSP and healthy controls regarding clinical and biomechanical measures at fixed treadmill velocity. HSP (n=24) HC (n=15) P-value Clinical Assessment Activities-specific Balance Confidence scale – six-item 59 ± 23 92 ± 8 < 0.001 Mini-BEST 20.0 ± 3.5 27.0 ± 1.0 < 0.001 Ten-meter walk test – comfortable (ms-1) 1.3 ± 0.2 1.6 ± 0.2 < 0.001 Ten-meter walk test – fast (ms-1) 1.8 ± 0.3 2.4 ± 0.2 < 0.001 Biomechanical assessment Step width (mm) 127 ± 36 119 ± 30 0.481 Coefficient of variation • Step length (%) 7.6 ± 2.5 5.2 ± 1.1 < 0.001 • Step time (%) 6.1 ± 2.4 4.3 ± 1.2 0.003 • Step width (%) 24.4 ± 10 17.0 ± 7.3 0.016 Mediolateral Margin of Stability (MoS) (mm) 39.8 ± 13 35.6 ± 7.8 0.262 Variability of MoS (mm) 11.4 ± 7 6.7 ± 2.3 0.001 Mediolateral Foot Placement Deviation (cm) 1.0 ± 0.2 0.9 ± 0.2 0.172 Local Divergence Exponents • Trunk - mediolateral 2.0 ± 0.2 1.8 ± 0.3 0.013 • Trunk - anteroposterior 1.8 ± 0.2 1.8 ± 0.3 0.786 • Trunk - vertical 1.5 ± 0.2 1.2 ± 0.2 0.003 • Pelvis - mediolateral 1.4 ± 0.2 1.5 ± 0.2 0.138 • Pelvis - anteroposterior 1.6 ± 0.2 1.7 ± 0.3 0.128 • Pelvis - vertical 1.4 ± 0.2 1.2 ± 0.2 0.018 Values displayed are means ± standard deviation. Abbreviations: Mini-BEST: Mini Balance Evaluation Systems Test. Mini-BEST ranges between 0-28 points; Activities-specific Balance Confidence scale – six-item ranges between 0-100 points.
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