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. 2004 Oct 12;63(7):1240-4.
doi: 10.1212/01.wnl.0000140706.52798.be.

Incidence of parkinsonism and Parkinson disease in a general population: the Rotterdam Study

L M L de Lau  1 , P C L M Giesbergen, M C de Rijk, A Hofman, P J Koudstaal, M M B Breteler
Affiliations

Incidence of parkinsonism and Parkinson disease in a general population: the Rotterdam Study

L M L de Lau et al. Neurology. .

Abstract

Objective: To investigate the incidence of parkinsonism and Parkinson disease (PD) in the general population using in-person screening along with clinical data.

Methods: In the Rotterdam study, a prospective population-based cohort study of people aged > or =55 years, the authors assessed age- and sex-specific incidence rates of parkinsonism and PD among 6,839 participants who were free of parkinsonism at baseline. Case finding involved in-person screening at baseline and two follow-up visits, and additional information was obtained through continuous monitoring of the cohort by computer linkage to general practitioners' and pharmacy records.

Results: After a mean follow-up period of 5.8 years, 132 subjects with incident parkinsonism were identified, of whom 67 (51%) had PD. The incidence of parkinsonism and PD increased with age, with incidence rates for PD increasing from 0.3 per 1000 person-years in subjects aged 55 to 65 years, to 4.4 per 1000 person-years for those aged > or =85 years. The overall age-adjusted incidence rate of any parkinsonism was not different in men and women, but men seem to have a higher risk for PD (male-to-female ratio, 1.54; 95% CI, 0.95 to 2.51).

Conclusion: Incidence rates for parkinsonism and Parkinson disease were higher than those reported by most previous studies, possibly because of the authors' intensive case-finding methods involving in-person screening.

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