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Journal Article
Research Support, Non-U.S. Gov't
The prevalence of frontotemporal dementia.
Neurology 2002 June 12
OBJECTIVE: To estimate the prevalence of frontotemporal dementia (FTD) and other degenerative early-onset dementias in a geographically defined population.
BACKGROUND: Early-onset dementia (at age <65 years) results in high psychiatric morbidity and caregiver burden. Prevalence figures are available for early-onset AD but not for FTD, a dementia that is almost invariably of early onset.
METHODS: Case ascertainment was by review of case records of three specialist clinic databases and inpatient admissions at a university hospital in Cambridge, United Kingdom, for patients with dementia who were <65 years of age, living in Cambridge City or East or South Cambridgeshire (population 326,019) on May 30, 2000. All the relevant health services in the area were also contacted for potential cases. Diagnosis of various dementias was based on published criteria. All patients with potential FTD were examined by the study investigators and underwent structural neuroimaging. The 1998 population estimates for the area were used to calculate age and sex prevalence with confidence intervals for AD, FTD, and other causes of dementia.
RESULTS: A total of 108 patients (66 men and 42 women) with dementia with onset before they were 65 years of age were identified, of whom 60 were <65 years on the census date, giving an overall prevalence of 81 (95% CI, 62.8 to 104.5) per 100,000 in the 45- to 64-year age group. The prevalences of early-onset FTD and AD were the same: 15 per 100,000 (8.4 to 27.0) in the 45- to 64-year-old population. The mean age at onset of FTD was 52.8 years and there was a striking male preponderance (14:3). It is possible case ascertainment methods resulted in a relative underrepresentation of some forms of dementia.
CONCLUSIONS: Frontotemporal dementia is a more common cause of early-onset dementia than previously recognized and appears to be more common in men.
BACKGROUND: Early-onset dementia (at age <65 years) results in high psychiatric morbidity and caregiver burden. Prevalence figures are available for early-onset AD but not for FTD, a dementia that is almost invariably of early onset.
METHODS: Case ascertainment was by review of case records of three specialist clinic databases and inpatient admissions at a university hospital in Cambridge, United Kingdom, for patients with dementia who were <65 years of age, living in Cambridge City or East or South Cambridgeshire (population 326,019) on May 30, 2000. All the relevant health services in the area were also contacted for potential cases. Diagnosis of various dementias was based on published criteria. All patients with potential FTD were examined by the study investigators and underwent structural neuroimaging. The 1998 population estimates for the area were used to calculate age and sex prevalence with confidence intervals for AD, FTD, and other causes of dementia.
RESULTS: A total of 108 patients (66 men and 42 women) with dementia with onset before they were 65 years of age were identified, of whom 60 were <65 years on the census date, giving an overall prevalence of 81 (95% CI, 62.8 to 104.5) per 100,000 in the 45- to 64-year age group. The prevalences of early-onset FTD and AD were the same: 15 per 100,000 (8.4 to 27.0) in the 45- to 64-year-old population. The mean age at onset of FTD was 52.8 years and there was a striking male preponderance (14:3). It is possible case ascertainment methods resulted in a relative underrepresentation of some forms of dementia.
CONCLUSIONS: Frontotemporal dementia is a more common cause of early-onset dementia than previously recognized and appears to be more common in men.
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