Table 2.
Quantitative and qualitative gait characteristics for the four groups
| NF-SS | F-SS | NF-CON | F-CON | |
|---|---|---|---|---|
| Quantitative measures | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD |
| Gait activity (min/day) | 35.9 ± 20.1 | 34.4 ± 24 | 47.5 ± 21.8 | 50 ± 19.8 |
| WB/day | 127 ± 64.5 | 125 ± 77.3 | 158 ± 54.4 | 152 ± 49.9 |
| Short WB (%) | 91.6 ± 4.8 | 92.4 ± 6.2 | 89.7 ± 6 | 90.2 ± 3.9 |
| Short WB epochs(%) | 27.8 ± 18.4 | 43.3 ± 28.5 | 25.5 ± 15.9 | 23.8 ± 10.1 |
| Qualitative measures | ||||
| Gait speed (m/s) | 0.74 ± 0.14 | 0.67 ± 0.17 | 0.93 ± 0.30 | 0.90 ± 0.21 |
| Stride time (seconds) | 1.26 ± 0.20 | 1.44 ± 0.40 | 1.14 ± 0.13 | 1.15 ± 0.08 |
| Harmonic Ratio VT | 1.31 ± 0.20 | 1.20 ± 0.20 | 1.92 ± 0.31 | 1.67 ± 0.32 |
| Harmonic Ratio ML | 1.33 ± 0.13 | 1.35 ± 0.22 | 1.45 ± 0.15 | 1.51 ± 0.26 |
| Harmonic Ratio AP | 1.17 ± 0.20 | 1.07 ± 0.20 | 1.71 ± 0.19 | 1.39 ± 0.24 |
| Freq. Variability VT | 0.15 ± 0.05 | 0.14 ± 0.03 | 0.14 ± 0.20 | 0.14 ± 0.02 |
| Freq. Variability ML | 0.18 ± 0.04 | 0.21 ± 0.05 | 0.16 ± 0.40 | 0.17 ± 0.04 |
| Freq. Variability AP | 0.17 ± 0.04 | 0.19 ± 0.05 | 0.14 ± 0.30 | 0.15 ± 0.04 |
| IH VT | 0.48 ± 0.18 | 0.39 ± 0.16 | 0.64 ± 0.12 | 0.56 ± 0.13 |
| IH ML | 0.38 ± 0.21 | 0.50 ± 0.25 | 0.34 ± 0.13 | 0.25 ± 0.15 |
| IH AP | 0.51 ± 0.15 | 0.52 ± 0.15 | 0.57 ± 0.11 | 0.52 ± 0.09 |
| Amplitude (psd) VT | 0.47 ± 0.12 | 0.40 ± 0.09 | 0.56 ± 0.09 | 0.58 ± 0.11 |
| Amplitude (psd) ML | 0.40 ± 0.15 | 0.50 ± 0.19 | 0.36 ± 0.08 | 0.36 ± 0.08 |
| Amplitude (psd) AP | 0.42 ± 0.11 | 0.46 ± 0.17 | 0.42 ± 0.09 | 0.41 ± 0.08 |
| Width (psd) VT | 0.98 ± 0.01 | 0.99 ± 0.02 | 0.95 ± 0.01 | 0.94 ± 0.01 |
| Width (psd) ML | 0.95 ± 0.02 | 0.95 ± 0.03 | 0.95 ± 0.01 | 0.95 ± 0.01 |
| Width (psd) AP | 0.95 ± 0.02 | 0.95 ± 0.01 | 0.94 ± 0.01 | 0.93 ± 0.01 |
| LDE/stride VT | 0.98 ± 0.19 | 1.02 ± 0.19 | 0.92 ± 0.15 | 0.94 ± 0.16 |
| LDE/stride ML | 0.89 ± 0.18 | 0.90 ± 0.20 | 0.71 ± 0.08 | 0.78 ± 0.11 |
| LDE/stride AP | 0.87 ± 0.19 | 0.90 ± 0.21 | 0.72 ± 0.10 | 0.78 ± 0.11 |
Table 2, Quantitative and qualitative gait characteristics for all four groups expressed as means and standard deviations. Abbreviations: WB is walking bouts, Freq. Variability is the stride frequency variability, IH is the Index of Harmonicity, Amplitude (psd) is the amplitude of the dominant peak in the power spectral density, Width (psd) is the width of the dominant peak in the power spectral density, LDE/stride is the local divergence exponent per stride. VT is the vertical direction, ML is the medio-lateral direction and AP is the anterior-posterior direction. Significant associations derived from logic regression (Table 3) are printed in bold