Parkinson's Disease Mediation Analysis of RBD, Depression, and Cognition

Featuring results from a longitudinal mediation analysis of 337 Parkinson's disease patients from the PPMI database. It explores how depression and cognitive function mediate the relationship between rapid eye movement sleep behavior disorder (RBD) and activities of daily living (ADL) across 9 standardized time points. The analysis employs Bayesian dynamic mediation and multiple time-varying causal mediation models.

Use Cases

• Analyze the time-varying Bayesian dynamic indirect mediating effect of depression between RBD and ADL across standardized time points.
• Model the increasing trend of cognition's mediating effect between RBD and ADL using the reported time-function curve.
• Validate the joint mediating effect of depression and cognition between RBD and ADL using the bidirectional decomposition method from the multiple time-varying causal mediation model.
• Examine the progression of mediating effects at specific follow-ups (e.g., 0.25, 0.50, 0.75 standardized time) using the provided confidence intervals.

Strengths

• Analysis is based on data from 337 patients from the Parkinson's Progression Markers Initiative (PPMI) database.
• Employs longitudinal analysis across 9 standardized time points to track mediation effects over time.
• Uses advanced statistical methods including Bayesian dynamic mediation analysis and multiple time-varying causal mediation models.

Limitations

• The underlying raw data columns and sample data are unavailable, limiting direct analytical reuse.
• The dataset is a 1.2 MB DOCX file containing study results, not a structured, machine-readable data table.
• The analysis is specific to the PPMI cohort, which may limit generalizability to other Parkinson's disease populations.

Provenance

Source

Parkinson's Progression Markers Initiative (PPMI) database.

Collection Method

Clinical assessments using validated rating scales for RBD, ADL, depression, and cognitive function.

Time Range

Longitudinal data analyzed across 9 follow-up time points, standardized to interval [0,1].

Freshness

Last updated 2026-03-20.