(a).
| Age | BBS | UPDRS III | AP SD OE | ML SD OE | Area ellipse OE | Total SD OE | AP SD OEC | ML SD OEC | Area ellipse OEC | Total SD OEC | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Age | 1.00 | −0.46 (p = 0.011) | 0.28 (p = 0.145) | −0.08 (p = 0.679) | 0.32 (p = 0.089) | 0.05 (p = 0.778) | −0.35 (p = 0.060) | 0.22 (p = 0.259) | 0.31 (p = 0.107) | 0.40 (p = 0.037) | −0.41 (p = 0.029) |
| BBS | −0.46 (p = 0.011) | 1.00 | −0.37 (p = 0.050) | −0.13 (p = 0.502) | −0.49 (p = 0.007) | −0.32 (p = 0.093) | −0.11 (p = 0.562) | −0.27 (p = 0.153) | −0.30 (p = 0.110) | −0.53 (p = 0.004) | 0.07 (p = 0.711) |
| UPDRS III | 0.28 (p = 0.145) | −0.37 (p = 0.050) | 1.00 | 0.04 (p = 0.824) | 0.20 (p = 0.309) | 0.19 (p = 0.343) | 0.02 (p = 0.906) | 0.16 (p = 0.408) | 0.30 (p = 0.117) | 0.30 (p = 0.129) | −0.06 (p = 0.746) |
| AP SD OE | −0.08 (p = 0.679) | −0.13 (p = 0.502) | 0.04 (p = 0.824) | 1.00 | 0.44 (p = 0.016) | 0.86 p < 0.001 | 0.14 (p = 0.476) | 0.46 (p = 0.012) | 0.22 (p = 0.256) | 0.37 (p = 0.051) | −0.13 (p = 0.517) |
| SD ML OE | 0.32 (p = 0.089) | −0.49 (p = 0.007) | 0.20 (p = 0.309) | 0.44 (p = 0.016) | 1.00 | 0.79 p < 0.001 | 0.04 (p = 0.849) | 0.67 p < 0.001 | 0.80 p < 0.001 | 0.74 p < 0.001 | −0.02 (p = 0.898) |
| Area ellipse OE | 0.05 (p = 0.778) | −0.32 (p = 0.093) | 0.19 (p = 0.343) | 0.86 p < 0.001 | 0.79 p < 0.001 | 1.00 | 0.13 (p = 0.518) | 0.71 p < 0.001 | 0.58 p < 0.001 | 0.63 p < 0.001 | −0.11 (p = 0.583) |
| Total SD OE | −0.35 (p = 0.060) | −0.11 (p = 0.562) | 0.02 (p = 0.906) | 0.14 (p = 0.476) | 0.04 (p = 0.849) | 0.13 (p = 0.518) | 1.00 | −0.06 (p = 0.745) | −0.15 (p = 0.423) | −0.01 (p = 0.974) | 0.86 p < 0.001 |
| AP SD OEC | 0.22 (p = 0.259) | −0.27 (p = 0.153) | 0.16 (p = 0.408) | 0.46 (p = 0.012) | 0.67 p < 0.001 | 0.71 p < 0.001 | −0.06 (p = 0.745) | 1.00 | 0.57 (p = 0.001) | 0.89 p < 0.001 | −0.17 (p = 0.392) |
| ML SD OEC | 0.31 (p = 0.107) | −0.30 (p = 0.110) | 0.30 (p = 0.117) | 0.22 (p = 0.256) | 0.80 p < 0.001 | 0.58 p < 0.001 | −0.15 (p = 0.423) | 0.57 (p = 0.001) | 1.00 | 0.79 p < 0.001 | −0.13 (p = 0.485) |
| Area ellipse OEC | 0.40 (p = 0.037) | −0.53 (p = 0.004) | 0.30 (p = 0.129) | 0.37 (p = 0.051) | 0.74 p < 0.001 | 0.63 p < 0.001 | −0.01 (p = 0.974) | 0.89 p < 0.001 | 0.79 p < 0.001 | 1.00 | −0.12 (p = 0.550) |
| Total SD OEC | −0.41 (p = 0.029) | 0.07 (p = 0.711) | −0.06 (p = 0.746) | −0.13 (p = 0.517) | −0.02 (p = 0.898) | −0.11 (p = 0.583) | 0.86 p < 0.001 | −0.17 (p = 0.392) | −0.13 (p = 0.485) | −0.12 (p = 0.550) | 1.00 |
BBS: Berg Balance Scale; UPDRS III: Unified Parkinson's Disease Rating Scale, part III; OE: open eyes; OEC: open eyes counting; AP SD OE: anteroposterior standard deviation of trunk sway with open eyes; ML SD OE: mediolateral standard deviation of trunk sway with open eyes; Total SD OE: total standard deviation of trunk sway with open eyes; AP SD OEC: anteroposterior standard deviation of trunk sway with open eyes counting; ML SD OEC: mediolateral standard deviation of trunk sway with open eyes counting; Total SD OEC: total standard deviation of trunk sway with open eyes counting.