Converting the UPDRS part III to the Hoehn and Yahr staging may not be adequate for a research database.
Fernandez
Hubert H
HH
Jacobson
Charles E
CE
Okun
Michael S
MS
D016208:Databases, Factual; D004185:Disability Evaluation; D006801:Humans; D010300:Parkinson Disease / Q000175:diagnosis*; D012106:Research / Q000706:statistics & numerical data; D012720:Severity of Illness Index