title: Incidence of dementia with Lewy bodies and Parkinson disease dementia.
abstract: OBJECTIVE
  Epidemiologic data on dementia with Lewy bodies (DLB) and Parkinson disease dementia (PDD) remain limited in the United States and worldwide. These data are essential to guide research and clinical or public health interventions.
  
  
  OBJECTIVE
  To investigate the incidence of DLB among residents of Olmsted County, Minnesota, and compare it with the incidence of PDD.
  
  
  METHODS
  The medical records linkage system of the Rochester Epidemiology Project was used to identify all persons who developed parkinsonism and, in particular, DLB or PDD from 1991 through 2005 (15 years). A movement disorders specialist reviewed the complete medical records of each suspected patient to confirm the diagnosis.
  
  
  METHODS
  Olmsted County, Minnesota, from 1991 through 2005 (15 years).
  
  
  METHODS
  All the residents of Olmsted County, Minnesota, who gave authorization for medical record research.
  
  
  METHODS
  Incidence of DLB and PDD.
  
  
  RESULTS
  Among 542 incident cases of parkinsonism, 64 had DLB and 46 had PDD. The incidence rate of DLB was 3.5 per 100,000 person-years overall, and it increased steeply with age. The incidence of PDD was 2.5 overall and also increased steeply with age. The incidence rate of DLB and PDD combined was 5.9. Patients with DLB were younger at onset of symptoms than patients with PDD and had more hallucinations and cognitive fluctuations. Men had a higher incidence of DLB than women across the age spectrum. The pathology was consistent with the clinical diagnosis in 24 of 31 patients (77.4%) who underwent autopsy.
  
  
  CONCLUSIONS
  The overall incidence rate of DLB is lower than the rate of Parkinson disease. The incidence of DLB increases steeply with age and is markedly higher in men. This men to women difference may suggest different etiologic mechanisms. Our findings may guide health care planning and prompt new studies.
authors.affiliation: Department of Neurology, College of Medicine, Mayo Clinic, Rochester, Minnesota2Division of Epidemiology, Department of Health Sciences Research, College of Medicine, Mayo Clinic, Rochester, Minnesota.
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Savica
authors.forename: Brandon R
authors.initials: BR
authors.lastname: Grossardt
authors.forename: James H
authors.initials: JH
authors.lastname: Bower
authors.forename: Bradley F
authors.initials: BF
authors.lastname: Boeve
authors.forename: J Eric
authors.initials: JE
authors.lastname: Ahlskog
authors.forename: Walter A
authors.initials: WA
authors.lastname: Rocca
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003704:Dementia / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D015994:Incidence; D020961:Lewy Body Disease / Q000175:diagnosis / Q000453:epidemiology*; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008910:Minnesota / Q000453:epidemiology; D010300:Parkinson Disease / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology*; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012720:Severity of Illness Index; D012737:Sex Factors
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