The Parkinsonian Motor Spectrum in Nonagenarians: A Population-Based Study.
BACKGROUND Population-based data on mild parkinsonian signs (MPS) and parkinsonism in nonagenarians are scarce. OBJECTIVES To estimate the prevalence of MPS, definite parkinsonism, and broader parkinsonian motor phenotypes; assess MPS after excluding idiopathic Parkinson disease and definite parkinsonism; and examine...