Dataset Information

Cognitive Performance Among Older Persons in Japan and the United States.

ABSTRACT: OBJECTIVE:To compare cognitive performance among Japanese and American persons, aged 68?years and older, using two nationally representative studies and to examine whether differences can be explained by differences in the distribution of risk factors or in their association with cognitive performance. DESIGN:Nationally representative studies with harmonized collection of data on cognitive functioning. SETTING:Nihon University Japanese Longitudinal Study of Aging and the US Health and Retirement Study. PARTICIPANTS:A total of 1953 Japanese adults and 2959 US adults, aged 68?years or older. MEASUREMENTS:Episodic memory and arithmetic working memory are measured using immediate and delayed word recall and serial 7s. RESULTS:Americans have higher scores on episodic memory than Japanese people (0.72 points on a 20-point scale); however, when education is controlled, American and Japanese people did not differ. Level of working memory was higher in Japan (0.36 on a 5-point scale) than in the United States, and the effect of education on working memory was stronger among Americans than Japanese people. There are no differences over the age of 85?years. CONCLUSION:Even with large differences in educational attainment and a strong effect of education on cognitive functioning, the overall differences in cognitive functioning between the United States and Japan are modest. Differences in health appear to have little effect on national differences in cognition. J Am Geriatr Soc 68:354-361, 2020.

SUBMITTER: Saito Y

PROVIDER: S-EPMC7002215 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Cognitive Performance Among Older Persons in Japan and the United States.

Saito Yasuhiko Y Kim Jung Ki JK Davarian Shieva S Hagedorn Aaron A Crimmins Eileen M EM

Journal of the American Geriatrics Society 20190911 2

<h4>Objective</h4>To compare cognitive performance among Japanese and American persons, aged 68 years and older, using two nationally representative studies and to examine whether differences can be explained by differences in the distribution of risk factors or in their association with cognitive performance.<h4>Design</h4>Nationally representative studies with harmonized collection of data on cognitive functioning.<h4>Setting</h4>Nihon University Japanese Longitudinal Study of Aging and the US ...[more]

PMID: 31509240

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Project description:Background and Objectives:Subjective cognitive decline (SCD), the self-reported experience of worsening or more frequent confusion or memory loss, may be associated with the development or worsening of chronic conditions or complicating their self-management. The objectives of this study were to (i) establish the prevalence of chronic conditions and multiple chronic conditions among adults with SCD, and (ii) compare the prevalence of chronic conditions among people with and without SCD and SCD-related functional limitations. Research Design and Methods:Data were analyzed from the Cognitive Decline module of the Behavioral Risk Factor Surveillance System administered in 49 states, DC, and Puerto Rico during 2015-2017. Analyses included 220,221 respondents aged 45 years or older who answered the SCD screening question and reported their chronic conditions. Weighted estimates were calculated and chi-square tests were used for comparisons. Results:Persons with a history of stroke, heart disease, and chronic obstructive pulmonary disorder had significantly higher prevalence of SCD compared to those without. The prevalence of having at least one chronic condition was higher among adults with SCD compared to adults without SCD in each age group (45-64 years: 77.4% vs 47.1%, p < .001; ?65 years: 86.3% vs 73.5%, p < .001). Among those with SCD, the prevalence of an SCD-related functional limitation was higher among those with at least one chronic condition compared to those with none (45-64 years: 63.3% vs 42.4%, p < .001; ?65 years: 40.0% vs 25.1%, p < .001). Only half of adults with SCD and a chronic condition had discussed their SCD with a health care professional. Discussion and Implications:SCD and chronic conditions commonly co-occur. Having a chronic condition was associated with greater SCD-related functional limitations. SCD might complicate the management of chronic conditions, and patients and providers should be aware of increased risk for cognitive decline in the presence of chronic diseases.

Project description:BackgroundU.S. nursing homes provide long-term care to over 1.2 million older adults, 60% of whom were physically frail and 68% had moderate or severe cognitive impairment. Limited research has examined the longitudinal experience of these two conditions in older nursing home residents.MethodsThis national longitudinal study included newly-admitted non-skilled nursing care older residents who had Minimum Data Set (MDS) 3.0 (2014-16) assessments at admission, 3 months, and 6 months (n = 266,001). Physical frailty was measured by FRAIL-NH and cognitive impairment by the Brief Interview for Mental Status. Separate sets of group-based trajectory models were fitted to identify the trajectories of physical frailty and trajectories of cognitive impairment, and to estimate the association between older residents' characteristics at admission with each set of trajectories. A dual trajectory model was used to quantify the association between the physical frailty trajectories and cognitive impairment trajectories.ResultsOver the course of the first six months post-admission, five physical frailty trajectories ["Consistently Frail" (prevalence: 53.0%), "Consistently Pre-frail" (29.0%), "Worsening Frailty" (7.6%), "Improving Frailty" (5.5%), and "Consistently Robust" (4.8%)] and three cognitive impairment trajectories ["Consistently Severe Cognitive Impairment" (35.5%), "Consistently Moderate Cognitive Impairment" (31.8%), "Consistently Intact/Mild Cognitive Impairment" (32.7%)] were identified. One in five older residents simultaneously followed the trajectories of "Consistently Frail" and "Consistently Severe Cognitive Impairment". Characteristics associated with higher odds of the "Improving Frailty", "Worsening Frailty", "Consistently Pre-frail" and "Consistently Frail" trajectories included greater at-admission cognitive impairment, age ≥ 85 years, admitted from acute hospitals, cardiovascular/metabolic diagnoses, neurological diagnoses, hip or other fractures, and presence of pain. Characteristics associated with higher odds of the "Consistently Moderate Cognitive Impairment" and "Consistently Severe Cognitive Impairment" included worse at-admission physical frailty, neurological diagnoses, hip fracture, and receipt of antipsychotics.ConclusionsFindings provided information regarding the trajectories of physical frailty, the trajectories of cognitive impairment, the association between the two sets of trajectories, and their association with residents' characteristics in older adults' first six months post-admission to U.S. nursing homes. Understanding the trajectory that the residents would most likely follow may provide information to develop a comprehensive care approach tailored to their specific healthcare goals.

Dataset Information

Cognitive Performance Among Older Persons in Japan and the United States.

Publications

Cognitive Performance Among Older Persons in Japan and the United States.

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