WHAT WE FOUND: We used different statistical methods to assess if apathy (lack of motivation) in people with PD changed over time. The linear mixed effects models showed a significant increase in apathy each year whereas other methods did not find this increase.
New preprint from @ahanff.bsky.social : Mixed effects models but not t-tests or linear regression detect progression of apathy in Parkinson’s disease over time: A comparative analysis. osf.io/preprints/os...