Association of time spent outdoors with the risk of Parkinson's disease: a prospective cohort study of 329,359 participants.

However, the PD risk decreased with increasing duration when the time spent outdoors was between 1 and 3 h/day, and then exhibited an increasing trend again ( P overall = 0.0322, P nonlinear = 0.0710).

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In the male population, a decreasing trend in the PD risk was noted with an increase in winter outdoor duration, although this trend was not statistically significant ( P overall = 0.1494, P nonlinear = 0.7961).

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