Parkinson’s Disease Gravity Index: A Method by means of Optimal Scaling

Table 4

Mean ± sd scores of the variables that make up the Parkinson’s Disease Severity Index.

Age dimension	68.6±11.0
Motor dimension	28.1±10.3
Depression dimension	5.4±2.7
Anxiety dimension	6.4±3.6
Cognitive dimension	63.3±18.9
Apathy dimension	12.5±8.9
Fatigue dimension	9.6±6.6
Nonmotor dimension	31.6±18.7
Psychosis dimension	1.5±1.6
Sleep dimension	7.6±4.6