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Black senior citizens most likely ethnic group to develop dementia

Large study finds wider variance in dementia among senior citizen ethnic groups

Dementia patient comforted by wifeFeb. 16, 2016 – Among those who reach age 65 dementia-free, 38% of blacks, 35% of American Indians/Alaskan Natives, 32% of Latinos, 30% of whites, 28% of Asian Americans and 25% of Pacific Islanders are projected to develop dementia in the next 25 years, according to researchers of a large study of ethnic disparities in dementia risk.

Researchers compared six ethnic and racial groups within the same geographic population and found significant variation in dementia incidence among them. The results are published online today in Alzheimer's & Dementia: The Journal of the Alzheimer's Association.

This is the first study to look at dementia risk in a large population representing the diversity of the United States. Researchers found dementia incidence to be highest in blacks and American Indian/Alaska Natives, lowest among Asian Americans, and intermediate among Latinos, Pacific Islanders and whites.

The researchers found that dementia incidence over the study period ranged from an average annual rate of 26.6 cases per 1,000 for blacks, and 22.2 cases per 1,000 for American Indians/Alaskan Natives, to 15.2 cases per 1,000 for Asian Americans. In between were Latinos and Pacific Islanders with an average annual rate of 19.6 cases per 1,000, and whites with 19.3 per 1,000.

"Most research on inequalities in dementia includes only one to two racial and ethnic groups, primarily whites and blacks," said lead author Elizabeth Rose Mayeda, PhD, postdoctoral fellow at University of California, San Francisco in the Department of Epidemiology and Biostatistics.

"This is the only research that directly compares dementia for these six racial and ethnic groups, representing the true aging demographic of the United States in a single study population."

The study population included more than 274,000 Northern California members of Kaiser Permanente, the nation's largest private integrated health care system with more than 10 million members. The researchers used electronic health records covering patient visits over 14 years - from January 2000 through December 2013 - to identify participants diagnosed with dementia, as well as their race and ethnicity. The dementia diagnoses were Alzheimer's, vascular dementia or non-specific dementia.

"Even in the lowest risk groups in the study, the lifetime risk of developing dementia is high - in every racial and ethnic group, over one in four people who survive to age 65 can expect to be diagnosed with dementia in their lifetime," said Rachel Whitmer, PhD, the principal investigator of the study and a research scientist at the Kaiser Permanente Division of Research.

Whitmer has an extensive research portfolio in aging epidemiology, specifically in predictors of cognitive decline and dementia, and population-level risk factors including metabolic, cardiovascular and inflammatory factors.

"This study has major public health implications. If all individuals aged 65 or older had the same rate of dementia as Asian Americans, 190,000 cases of dementia would be prevented annually," Whitmer added.

"These findings underscore the need to better understand risk factors for dementia throughout life to identify strategies to eliminate these inequalities."

The researchers emphasize that while this study documents racial and ethnic disparities in dementia, the next step is to understand the mechanisms driving these inequalities.

"Based on the present study, we cannot determine the extent to which genetic or social and behavioral factors contribute to the observed patterns," said Whitmer.

"But if social and behavioral factors are the primary pathways, these findings suggest substantial reductions in dementia incidence are possible."

Notes:

Other authors of the study include Charles Quesenberry, PhD, of the Kaiser Permanente Division of Research, and Maria Glymour, ScD, of University of California, San Francisco in the Department of Epidemiology and Biostatistics.

This study was supported by grants from the National Institute on Aging (P30-AG15272) and the Kaiser Community Benefits Health Policy and Disparities Research Program Foundation.

 

Related Alzheimer's & Mental Health News - Senior Journal Archives

Decline in dementia cases found in new study

“…study offers hope that some of the dementia cases might be preventable - or at least delayed” - Feb. 12, 2016

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