Depression and Mood Changes in People with Parkinson's Disease over Time: A 5-Year Follow-Up Study.

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Background and Objective: Depression is frequent in Parkinson's disease (PD), but it is unclear how mood changes and impacts patient's quality of life (QoL) over time. Our objective was to analyze the frequency of depression and mood changes in people with PD (PwP) over 5 years of follow-up, comparing it with a control group, as well as its relationship with the patients' QoL. Patients and Methods: PwP and healthy controls (HC) recruited from the COPPADIS cohort from January/2016 to November/2017 were included in this 5-year follow-up study. Mood was assessed by the Beck Depression Inventory II (BDI-II), and participants were classified as having major depression, minor depression, subthreshold depression, or non-depression at baseline and at 2, 4, and 5 years of follow-up. Correlation analysis and linear regression models were applied. Results: The BDI-II total score increased from 8.1 ± 6.2 at baseline to 10.3 ± 8.1 at the 5-year follow-up visit in PwP (p p = 0.896]). The prevalence of depression remained around 50-54% in the PwP group and 21-25% in the HC group throughout the follow-up period, but the mood state showed variability for each patient between visits. Patients' QoL was associated with the depressive state throughout the entire follow-up period (p Conclusions: Mood change over time in PwP is associated with QoL.

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