Table 1.
Results of exploratory factor analysis
| ITEM | Factor 1 | Factor 2 | Factor 3 | Factor 4 |
|---|---|---|---|---|
| Facial expression (UPDRS) | 0.464 | |||
| Postural head tremor (CRST) | 0.407 | 0.475 | ||
| Speech (UPDRS) | 0.617 | |||
| Dysarthria: fluency of speech (ICARS) | 0.495 | |||
| Dysarthria: clarity of speech (ICARS) | 0.479 | |||
| Upper extremity tremor at rest (UPDRS) R hand | 0.408 | |||
| Upper extremity tremor at rest (UPDRS) L hand | 0.624 | |||
| Action or postural tremor of hands (UPDRS) R hand | 0.684 | |||
| Action or postural tremor of hands (UPDRS) L hand | 0.744 | |||
| Finger‐to‐nose: intention tremor of finger (ICARS) R arm | 0.785 | |||
| Finger‐to‐nose: intention tremor of finger (ICARS) L arm | 0.793 | |||
| Finger taps (UPDRS) R hand | 0.574 | |||
| Finger taps (UPDRS) L hand | 0.650 | |||
| Hand movements (UPDRS) R hand | 0.706 | |||
| Hand movements (UPDRS) L hand | 0.591 | |||
| Rapid alternating movements of hands (UPDRS) R hand | 0.764 | |||
| Rapid alternating movements of hands (UPDRS) L hand | 0.791 | |||
| Pronation‐supination alternating movements (ICARS) R arm | 0.417 | 0.554 | ||
| Pronation‐supination alternating movements (ICARS) L arm | 0.544 | |||
| Leg tremor at rest (UPDRS) R foot | 0.840 | |||
| Leg tremor at rest (UPDRS) L foot | 0.829 | |||
| Leg agility (UPDRS) R leg | 0.482 | 0.504 | ||
| Leg agility (UPDRS) L leg | 0.430 | 0.541 | ||
| Arising from chair (UPDRS) | 0.671 | |||
| Postural stability (UPDRS) | 0.650 | |||
| Body bradykinesia and hypokinesia (UPDRS) | 0.817 | |||
| Posture (UPDRS) | 0.585 | 0.403 | ||
| Gait (UPDRS) | 0.861 | |||
| Walking capacities (ICARS) | 0.877 | |||
| Gait speed (ICARS) | 0.776 | |||
| Tandem walking (UPDRS) | 0.616 | |||
| Handwriting (CRST) | 0.531 | |||
| Archimedes' spiral on pre‐drawn pattern (ICARS) | 0.660 |
Note: Factor with the highest factor loading is highlighted in gray. Significant factor loading set at ≥ 0.40.