title: Unified Parkinson's Disease Rating Scale (UPDRS) part I as a screening and diagnostic instrument for apathy in patients with Parkinson's disease.
authors.forename: D A
authors.initials: DA
authors.lastname: Gallagher
authors.forename: A J
authors.initials: AJ
authors.lastname: Lees
authors.forename: A
authors.initials: A
authors.lastname: Schrag
mesh_terms: D000368:Aged; D019540:Area Under Curve; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019964:Mood Disorders / Q000175:diagnosis* / Q000209:etiology; D009042:Motivation; D010300:Parkinson Disease / Q000150:complications / Q000523:psychology*; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity