1

Uc

I / II / III / IV / V / VI / VII / VIII / UPDRS Item
PIGD / Bradykinesia / Left Tremor / Rigidity / Bulbar / Dexterity / Right Tremor / Mental
0.74 / Postural Stability
0.74 / Arising from Chair
0.73 / Gait
0.61 / Posture
0.59 / Falling (Unrelated to Freezing) *
0.57 / Freezing when Walking *
0.51 / Walking *
0.50 / . / Body Bradykinesia and Hypokinesia
0.46 / Left Leg Agility
0.73 / Hand Movements - Right Hand
0.71 / Rapid/Alt Movements - Right Hand
0.68 / . / Finger Taps - Right Hand
0.60 / Hand Movements - Left Hand
0.58 / Rapid/Alt Movements - Left Hand
0.55 / Right Leg Agility
0.53 / Finger Taps - Left Hand
0.86 / Tremor at Rest - Left Arm
0.82 / Tremor - Left Arm *
0.65 / Action/Postural Tremor - Left Arm
0.62 / Tremor at Rest - Left Leg
0.82 / Rigidity - Right Leg
0.82 / Rigidity - Left Leg
0.70 / Rigidity - Left Arm
0.67 / Rigidity - Right Arm
0.61 / . / Rigidity - Neck
0.74 / Speech
0.73 / Speech *
0.61 / Facial Expression
0.56 / Salivation *
0.41 / . / Swallowing *
0.67 / Dressing *
0.63 / Hygiene *
0.60 / Cutting Food/Handling Utensils *
0.57 / Turning in Bed *
0.43 / . / Handwriting *
0.83 / Tremor at Rest - Right Arm
0.81 / Tremor - Right Arm *
0.60 / Action/Postural Tremor - Right Arm
0.55 / . / Tremor At Rest - Right Leg
0.69 / Depression
0.66 / Motivation/Initiative
0.56 / Intellectual Impairment
0.37 / Thought Disorder
0.36 / Sensory Complaints *

Table e-1. Principal component factor analysis of the UPDRS using orthogonal (varimax) rotation. Eight factors accounted for 60.8% of the total sample variance. Only the largest factor loading for a given item is presented. PIGD=postural instability/gait disorder. An asterisk (*) indicates that the item is from Part II (ADL) of the UPDRS.