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Is physical activity (PA) associated with a lower incidence of Parkinson disease (PD) in women? To find out, investigators analyzed long-term data from the ongoing E3N cohort study of nearly 100,000 women affiliated with a French national health plan (Eur J Epidemiol 2022;37:513).
The researchers used lagged analyses to compare PA trajectories between 1196 PD cases and 23,879 matched controls and applied a time-varying latent PA (LPA) variable with latent-process mixed models. PD diagnosis was based on medical records or a validated drug claim algorithm, and a nested case-control study was applied to LPA trajectories using multivariable linear mixed models and a retrospective timescale. A Cox proportional hazards model using age as the times…