Proximity to Golf Courses and Risk of Parkinson Disease

This study found that people living within 1–3 miles of a golf course found twice as Parkinson's disease patients as those living more than 6 miles away. The association, while statistically significant, cannot be confirmed as caused by golf course pesticides because the study design cannot rule out other explanations.

• Golf course location and urban density are linked: Cases were much more likely to live in cities (80%) than controls (31%), and golf courses are more common near cities — so the higher PD risk may partly reflect other urban exposures (air pollution, traffic, industrial chemicals)
• Pesticide exposure was never measured directly: Living near a golf course is used as a stand-in for pesticide exposure; the study cannot confirm that residents actually encountered golf course pesticides
• Key risk factors not accounted for: Occupational pesticide exposure, genetic predisposition, and head trauma were not captured, any of which could differ between groups
• The finding is an association, not a cause or risk: The study design (case-control, observational) can identify patterns but cannot establish that golf courses cause or increase risk Parkinson's disease. Risk will need a time variable in the study.