Parkinson’s Disease

Research Article

Confirmatory Factor Analysis of the Motor Unified Parkinson’s Disease Rating Scale

Table 4

Pearson correlations between total UPDRS motor and subscales off and on medication.

OFF medications

ON medications

Total motor UPDRS*

Gait/Posture

Tremor

Rigidity

Right

Left

Total motor UPDRS*

Gait/Posture

Tremor

Rigidity

Right

Left

OFF medications

Total motor UPDRS*

1.00

Gait/Posture

0.63^b

1.00

Tremor

0.19^a

0.17^a

1.00

Rigidity

0.45^b

0.35^b

0.10

1.00

Right

0.57^b

0.52^b

0.16^a

0.40^b

1.00

Left

0.65^b

0.61^b

0.14^a

0.45^b

0.50^b

1.00

ON medications

Total motor UPDRS*

0.90^b

0.80^b

0.36^b

0.49^b

0.64^b

0.73^b

1.00

Gait/Posture

0.76^b

0.90^b

0.20^a

0.30^b

0.43^b

0.56^b

0.62^b

1.00

Tremor

0.32^b

0.15^a

0.81^b

0.07

0.09

0.15^a

0.27^b

0.24^a

1.00

Rigidity

0.47^b

0.32^b

0.14

0.72^b

0.34^b

0.43^b

0.33^b

0.13

1.00

Right

0.69^b

0.51^b

0.17^a

0.40^b

0.83^b

0.50^b

0.59^b

0.49^b

0.17^a

0.38^b

1.00

Left

0.80^b

0.61^b

0.20^a

0.45^b

0.52^b

0.87^b

0.70^b

0.61^b

0.23^a

0.42^b

0.59^b

1.00

*Total UPDRS motor scores are adjusted for overlap with subscales. For example, correlation total UPDRS motor with Gait/Posture subscale was calculated as: Total UPDRS OFF with no Gait/Posture OFF items = Total UPDRS OFF − Gait/Posture OFF items.
^a.
^b.