TABLE 2. Statistical Analysis of the Transition Features.
| Domain | Feature | Sit-to-stand transitions from the dominant hand (54 participants) | |||||
|---|---|---|---|---|---|---|---|
| Mean | 95% CI | Adjusted p-valuea | hICC (95% CI) | ||||
| Non-fallers | Fallers | Non-fallers | Fallers | ||||
| Time | bPeak_VT, [g] | 1.27 | 1.17 | 1.25–1.30 | 1.09–1.26 | 0.253 | 0.79 (0.74–0.84) |
| Peak_AP, [g] | 0.38 | 0.73 | 0.36–0.40 | 0.61–0.85 | p<0.001* | 0.81 (0.76–0.85) | |
| Peak_ML, [g] | 0.862 | 0.79 | 0.84–0.88 | 0.68–0.90 | 0.137 | 0.84 (0.80–0.88) | |
| Jerk_SVM | 0.0032 | 0.0025 | 0.0032–0.0034 | 0.0019–0.0030 | p<0.001* | 0.63 (0.56–0.71) | |
| Median_SVM, [g] | 1.0105 | 0.9945 | 1.0041–1.0170 | 0.9572–1.0319 | 0.623 | 0.87 (0.84–0.91) | |
| dTTFS, [s] | 1.75 | 1.30 | 1.67–1.83 | 1.40–1.81 | 0.150 | 0.89 (0.86–0.92) | |
| fAFS, [g] | 1.27 | 0.94 | 1.22–1.33 | 0.60–1.27 | 0.096 | 0.91 (0.88–0.93) | |
| Oscillation_ML | 0.0040 | 0.0025 | 0.0034–0.0046 | 0.0019–0.0033 | 0.137 | 0.74 (0.69–0.81) | |
| Oscillation_VT | 0.0046 | 0.0022 | 0.0041–0.0052 | 0.0018–0.0027 | 0.078 | 0.75 (0.69–0.81) | |
| Oscillation_AP | 0.0073 | 0.0051 | 0.0066–0.0081 | 0.0037–0.0065 | 0.253 | 0.77 (0.72–0.82) | |
| Frequency | gAS | 0.0095 | 0.0052 | 0.0086–0.0104 | 0.0044–0.0059 | 0.027 | 0.83 (0.80–0.88) |
| hIH_VT | 25.8 | 22.5 | 24.6–26.9 | 18.1–26.8 | 0.096 | 0.68 (0.61–0.75) | |
| IH_AP | 14.1 | 16.7 | 13.5–14.7 | 11.4–22.1 | 0.652 | 0.78 (0.73–0.83) | |
| IH_ML | 16.1 | 13.8 | 15.2–17.1 | 11.0–16.6 | 0.508 | 0.76 (0.70–0.81) | |
| iFF_VT | 1.23 | 1.19 | 1.18–1.27 | 1.02–1.37 | 0.623 | 0.82 (0.78–0.87) | |
| Entropy_VT | 5.25 | 5.08 | 5.22–5.28 | 4.87–5.28 | 0.508 | 0.78 (0.73–0.84) | |
| Entropy_AP | 5.01 | 4.91 | 4.98–5.04 | 4.71–5.10 | 0.698 | 0.83 (0.79–0.88) | |
| Entropy_ML | 5.05 | 4.91 | 5.02–5.08 | 4.72–5.11 | 0.623 | 0.85 (0.81–0.89) | |
| Energy_VT | 0.75 | 0.69 | 0.73–0.77 | 0.61–0.77 | 0.278 | 0.80 (0.76–0.84) | |
| Energy_AP | 0.29 | 0.32 | 0.28–0.30 | 0.26–0.37 | 0.623 | 0.80 (0.75–0.84) | |
| Energy_ML | 0.28 | 0.26 | 0.27–0.29 | 0.21–0.31 | 0.612 | 0.84 (0.79–0.90) | |
P-values adjusted for the multiple comparison;
VT depicts X axis of the local coordination system of the sensor, AP is the Y axis, while ML is the Z axis;
cTTFS = Time To First Arm Swing;
AFS = Amplitude of the First Step;
eAS = Amount of Support;
IH = Index of Harmonicity;
FF = Fundamental Frequency;
ICC = Interclass correlation coefficient; P-values depicted with
are lower than the critical Benjamini-Hochberg p-value (p<0.014).