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BackgroundHigh education level and high occupational complexity have been implicated as risk factors for Parkinson's disease (PD).ObjectiveThe objective was to determine whether cognitive capacity, measured as IQ, in early adulthood is associated with the subsequent development of PD.MethodData on IQ were retrieved from the Swedish Military Service Conscription Registry, comprising Swedish males who enlisted for military service in the period 1968-1993 (N = 1,319,235). After exclusion, 1,189,134 subjects in total were included in the present study. Individuals who later developed PD (N = 1,724) were identified using the Swedish National Patient Register and the Swedish Cause of Death Register.ResultsHigh education level was associated with PD. High IQ was associated with PD (p ConclusionsThis study identifies high IQ to be a risk factor for PD.
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