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DOI: 10.2337/dc06-2011
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Original Research |
Type 2 diabetes and the risk of Parkinson's disease
1Department of Health Promotion and Chronic Diseases Prevention, National Public Health Institute, Helsinki, Finland
2Department of Public Health, University of Helsinki, Helsinki, Finland
3Tampere School of Public Health, University of Tampere, Tampere, Finland
4Oulu City Hospital and Department of Internal Medicine, University of Oulu, Oulu, Finland
5South Ostrobothnia Central Hospital, Seinäjoki, Finland
hu.gang{at}ktl.fi
ABSTRACT
Objective- The aim of this study was to evaluate whether type 2 diabetes at baseline is a risk factor for Parkinson's disease.
Research design and methods- We prospectively followed 51 552 Finnish men and women of 25 to 74 years of age without a history of Parkinson's disease at baseline. History of diabetes and other study parameters were determined at baseline using standardized measurements. Ascertainment of the Parkinson's disease status was based on the nationwide Social Insurance Institution's Drug Register data. Hazards ratios of incident Parkinson's disease associated with the history of type 2 diabetes were estimated.
Result- During a mean follow up period of 18.0 years, 324 men and 309 women developed incident Parkinson's disease. Age-and study year-adjusted hazard ratios of incident Parkinson's disease among subjects with type 2 diabetes, compared to those without it, were 1.80 (95% CI 1.03-3.15) in men, 1.93 (95% CI 1.05-3.53) in women, and 1.85 (95% CI 1.23-2.80) in men and women combined (adjusted also for sex), respectively. Further adjustment for body mass index, systolic blood pressure, total cholesterol, education, leisure time physical activity, smoking, alcohol drinking, coffee and tea consumption affected the results only slightly. The multivariate adjusted association between type 2 diabetes and the risk of Parkinson's disease was also confirmed in stratified subgroup analysis.
Conclusion- These data suggest that type 2 diabetes is associated with an increased risk of Parkinson's disease. Surveillance bias might account for higher rates in diabetes. The mechanism behind this association between diabetes and Parkinson's disease is not known.
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