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Parkinson's Psychosis Rating Scale (PPRS)
Please visit this website for more information about the instrument: Parkinson's Psychosis Rating Scale
Supplemental: Parkinson's Disease (PD)
Short Description of Instrument
The Parkinson's Psychosis Rating Scale (PPRS) is a 6-item clinician rated scale that measures the severity of psychosis symptoms in PD patients.
Comments/Special Instructions
The PPRS is a suggested scale for use in Parkinson's Disease Psychosis by a Movement Disorder Society Task Force in 2008 (Fernandez et al., 2008).
Scoring and Psychometric Properties
Scoring: The 6 items (visual hallucinations, illusions/misidentification, paranoid ideation, sleep disturbance, confusion, and sexual preoccupation) are scored from 1=no symptoms to 4=extreme symptoms and summed for a total score. The total score guidelines are mild (8-12), moderate (13-18), and severe (19-24).
Psychometric Properties: In a PDP sample, interrater reliability for each item was good (Spearman's rho =0.8-0.99), internal consistency across three rater for each item had a range of Cronbach's alpha=0.31-0.80. (Friedberg et al., 1998).
Strengths: The PPRS is short and covers some psychotic features (illusions, misperceptions) not assessed with other scale.
Weaknesses: The PPRS does not cover the full spectrum of psychotic phenomena. Items for sleep disturbance, confusion, and sexual preoccupation are not part of the psychosis construct but may be related symptoms.
Key References:
Friedberg G, Zoldan J, Weizman A, Melamed E. Parkinson Psychosis Rating Scale: a practical instrument for grading psychosis in Parkinson's disease. Clin Neuropharmacol. 1998 Sep-Oct;21(5):280-4.
Fernandez HH, Aarsland D, FÉnelon G, Friedman JH, Marsh L, TrÖster AI, Poewe W, Rascol O, Sampaio C, Stebbins GT, Goetz CG. Scales to Assess Psychosis in Parkinson's Disease. Mov Disord. 2008 Mar 15;23(4):484-500.
Document last updated August 2022