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In a prospective longitudinal cohort study of dementia and mortality in persons with Down syndrome aged 45 years and older, 85 postmenopausal women were followed for a mean follow-up time of 4.3 years (range 0.0 to 7.4 years). The effect of age at menopause on age at diagnosis of dementia and survival was estimated using correlation analysis and Cox Proportional Hazard Model. We found a significant correlation between age at menopause and age at diagnosis of dementia (rho=0.52; p< 0.001), and between age at menopause and age at death (rho=0.49; p=0.01). Early age at menopause is associated with a 1.8 fold increased risk of dementia: Hazard Ratio (HR): 1.82 (95%Confidence Interval (CI): 1.31-2.52) and with risk of death: HR: 2.05 (95%CI: 1.33-3.16). Our study suggests that age at menopause in women with Down syndrome is a determinant of age at onset of dementia and mortality.

Original publication

DOI

10.3233/jad-2010-1247

Type

Journal article

Journal

Journal of Alzheimer's disease : JAD

Publication Date

01/2010

Volume

19

Pages

545 - 550

Addresses

Department of Epidemiology & Biostatistics, Erasmus MC, Rotterdam, The Netherlands Dichterbij, Centre for the Intellectually Disabled, Gennep, The Netherlands.

Keywords

Humans, Dementia, Down Syndrome, Confidence Intervals, Proportional Hazards Models, Risk Factors, Retrospective Studies, Longitudinal Studies, Age Factors, Age of Onset, Menopause, Time Factors, Aged, Middle Aged, Female