Table 3.
Factor loading matrix for 21 variables after promax rotation for the physical performance data.
| Factor 1 | Factor 2 | Factor 3 | Factor 4 | Factor 5 | Factor 6 | Factor 7 | |
|---|---|---|---|---|---|---|---|
| MDS-UPDRS II 9 Turning in bed | 0.51 | 0.049 | −0.071 | −0.044 | −0.122 | −0.109 | −0.197 |
| MDS-UPDRS III 7 Toe tapping | 0.459 | −0.111 | −0.034 | 0.022 | −0.048 | 0.107 | 0.067 |
| MDS-UPDRS III 9 Arising from chair | 0.882 | −0.114 | −0.033 | −0.005 | 0.065 | −0.007 | −0.084 |
| MDS-UPDRS III 10 Gait | 0.843 | 0.046 | 0.04 | −0.021 | 0.033 | −0.03 | 0.175 |
| MDS-UPDRS III 11 Freezing of gait | 0.848 | −0.024 | −0.048 | −0.002 | 0.082 | 0.052 | 0.016 |
| MDS-UPDRS III 12 Postural stability | 0.323 | 0.124 | −0.012 | 0.063 | 0.018 | −0.098 | 0.684 |
| MDS-UPDRS III 13 Posture | 0.533 | 0.04 | 0.117 | −0.009 | −0.177 | 0.037 | 0.293 |
| Mini-BESTest Anticipatory postural adjustment | −0.204 | 0.776 | −0.015 | −0.026 | −0.021 | −0.082 | −0.062 |
| Mini-BESTest Automatic postural responses | −0.035 | 0.338 | 0.024 | −0.029 | −0.016 | 0.054 | −0.435 |
| Mini-BESTest Sensory orientation | −0.101 | 0.869 | −0.026 | −0.023 | 0.043 | 0 | 0.112 |
| Mini-BESTest Dynamic gait | −0.189 | 0.746 | 0.018 | −0.002 | −0.011 | 0.035 | 0.028 |
| TIS perception of trunk verticality | 0.042 | 0.04 | 0.023 | −0.025 | 0.781 | −0.009 | 0.061 |
| TIS trunk rotation muscle strength on the right side | −0.014 | −0.033 | −0.134 | 1.165 | −0.07 | −0.023 | 0.067 |
| TIS trunk rotation muscle strength on the left side | 0.021 | −0.003 | 0.139 | 0.582 | 0.104 | 0.02 | −0.076 |
| TIS righting reflex on the left side | −0.018 | −0.014 | 0.962 | −0.031 | 0.019 | −0.025 | −0.016 |
| TIS righting reflex on the right side | −0.005 | −0.02 | 1.051 | −0.114 | −0.023 | 0.005 | 0.009 |
| TIS verticality | 0.063 | −0.012 | −0.031 | −0.052 | 0.987 | −0.001 | −0.014 |
| TIS abdominal muscle strength | 0.026 | 0.118 | 0.334 | 0.275 | 0.049 | 0.025 | −0.078 |
| General lower extremity extension torque | 0.025 | 0.001 | −0.032 | −0.011 | −0.014 | 0.894 | −0.076 |
| Two-minute walk test | −0.164 | 0.462 | −0.042 | 0.034 | −0.013 | 0.315 | 0.038 |
| Handgrip force | −0.018 | −0.065 | 0.028 | −0.025 | 0.017 | 0.821 | −0.011 |
| Sum of squared loadings | 3.19 | 2.31 | 2.21 | 1.80 | 1.67 | 1.62 | 0.87 |
| Proportion of variance | 0.15 | 0.11 | 0.11 | 0.09 | 0.08 | 0.08 | 0.04 |
| Cumulative proportion of variance | 0.15 | 0.26 | 0.37 | 0.45 | 0.53 | 0.61 | 0.65 |
Bold values indicate loadings > 0.30. MDS-UPDRS, movement disorders society-unified Parkinson’s disease rating scale; Mini-BESTest, Mini Balance Evaluation Systems Test; TIS, Trunk Impairment Scale.