Older adults with limited literacy are at increased risk for likely dementia

Episodic memory improvement in illiterate adults attending late-life education irrespective of low socioeconomic status: insights from the PROAME study

The majority of people with dementia live in low or middle-income countries (LMICs) where resources that play a crucial role in brain health, such as quality education, are still not widely available. In Brazil, illiteracy remains a prevalent issue, especially in communities with lower socioeconomic status (SES). The PROAME study set out to explore basic education in illiterate adults as a means to improve cognitive reserve.

Objective

This manuscript aims to explore the relationship between SES and learning, as well as cognitive outcomes, in an older illiterate population.

Methods

This six-month clinical trial (NCT04473235) involved 108 participants, of which 77 concluded all assessments, enrolled in late-life basic education. SES assessments included Quality of Urban Living Index, Municipal Human Development Index and Household SES calculated for each participant. Cognitive assessments encompassed the Free and Cued Selective Reminding Test (FCSRT), a word list to assess reading, and the Beta III matrix.

Results

The sample consisted primarily of women, with a mean age of 58.5. Participants improved their reading (p=0.01) and their FCSRT (p=0.003). Regarding episodic memory, women outperformed men (p=0.007) and younger participants improved more than their older counterparts (p=0.001). There was no association observed between SES and cognitive outcomes.

Conclusion

Irrespective of SES, participants demonstrated positive outcomes after attending basic education. These findings highlight that late life education could be an important non-pharmacologic preventative measure, especially in LMICs.

A culturally and linguistically tailored Community-Engaged Dementia Education Program (CEDEP) for the Houston Vietnamese American community

Data from the Vietnamese Aging and Care Survey (VACS) showed the high prevalence of disability, depressive symptoms, and cognitive impairment in older Vietnamese immigrants and refugees. We proposed a Community-Engaged Dementia Education Program to examine the Houston Vietnamese American community's literacy on dementia and develop a one-pager educational material. This is a cross-sectional, qualitative study (interviews and focus groups) using the Cultural Exchange Model as a conceptual framework. We interviewed fourteen Vietnamese key informants and assessed the community's knowledge of dementia based on Edwards' 9-stage Community Readiness Model. The community's low literacy on dementia (Stages 2-3: Denial/resistance to vague awareness) was revealed. Approaches to introducing dementia conversations to the community and what to include in the one-pager were discussed. Based on the key informants' insight, we developed a dementia one-pager tailored to the community by using lay language with a representative image of the target population, indicating warning signs of dementia, and encouraging them to see their doctors for cognitive check-ups. The plan for the next steps includes utilizing the local ethnic media, collaborating with the existing pillars of the Cultural Exchange model, leveraging the university students' learning opportunities, and disseminating the culturally and linguistically tailored one-pager.

A prediction model of cognitive impairment risk in elderly illiterate Chinese women

Objective

To establish and validate a targeted model for the prediction of cognitive impairment in elderly illiterate Chinese women.

Methods

1864 participants in the 2011-2014 cohort and 1,060 participants in the 2014-2018 cohort from the Chinese Longitudinal Healthy Longevity Survey (CLHLS) were included in this study. The Chinese version of the Mini-Mental State Examination (MMSE) was used to measure cognitive function. Demographics and lifestyle information were collected to construct a risk prediction model by a restricted cubic spline Cox regression. The discrimination and accuracy of the model were assessed by the area under the curve (AUC) and the concordance index, respectively.

Results

A total of seven critical variables were included in the final prediction model for cognitive impairment risk, including age, MMSE score, waist-to-height ratio (WHtR), psychological score, activities of daily living (ADL), instrumental abilities of daily living (IADL), and frequency of tooth brushing. The internal and external validation AUCs were 0.8 and 0.74, respectively; and the receiver operating characteristic (ROC) curves indicated good performance ability of the constructed model.

Conclusion

A feasible model to explore the factors influencing cognitive impairment in elderly illiterate women in China and to identify the elders at high risk was successfully constructed.

Examining the relationship between health literacy and quality of life: evidence from older people admitted to the hospital

INTRODUCTION

Literacy has become an increasingly serious problem, especially as it relates to health care. In this regard, health literacy (HL), as a cognitive skill, has proven to be an influential factor to improve of the quality of life (QOL). This study aimed to examine the level of HL and its relationship with the QOL of older people at the time of discharge from the hospital in the south of Iran.

METHODS

This descriptive-analytical cross-sectional study included 300 older people admitted and treated in 10 teaching-therapeutic hospitals affiliated with the Shiraz University of Medical Sciences in 2021. The standard Health Literacy for Iranian Adults (HELIA) questionnaire and the World Health Organization Quality of Life Questionnaire (WHOQOL-BREF) were used to collect the required data. Data were analyzed with SPSS software version 23 software using descriptive and inferential statistics, Pearson's correlation coefficient, T-test, ANOVA, and multiple linear regression at p = 0.05.

RESULTS

The mean scores of Hl and QOL for older people were 48.22 ± 9.63 (out of 100) and 61.59 ± 12.43 (out of 120), respectively. Moreover, there was a significant direct correlation between the participants' HL and their QOL (r=0.388, p<0.001). All dimensions of HL, including comprehension (β=0.461, p<0.001), decision-making and behavior (β=0.434, p<0.001), access (β=0.397, p<0.001), reading skill (β=0.362, p=0.002), and assessment (β=0.278, p=0.004), were significant relationship with QOL. A statistically significant difference was revealed between the mean scores of HL regarding the participants' gender (p=0.04) and level of education (p=0.001). Furthermore, the mean scores of QOL were significantly different with regard to older people's gender (p=0.02), marital status (p=0.03), level of education (p=0.002), and income (p=0.01).

CONCLUSION

The findings revealed the participants' inadequate HL and average QOL. Considering the relationship of HL with QOL, it is recommended to develop comprehensive programs and effective interventions to develop HL skills and subsequently improve QOL among older people.

An adapted Arabic version of the Test of Nine Images for the illiterate Lebanese population: Validation and preliminary normative data

OBJECTIVES

In the absence of a simple validated instrument to screen for cognitive impairment among illiterate Lebanese older adults, the aims of this study were to validate an Arabic version of the Test of Nine Images (A-TNI93) adapted by the Working Group on Dementia at Saint Joseph University: Groupe de Travail sur les Démences de l'Univesité Saint Joseph (GTD-USJ) for illiterate older Lebanese and to establish normative data.

METHOD

A national population-based sample of 332 community-dwelling illiterate Lebanese aged 55 years and older was administered the A-TNI93 (GTD-USJ) scoring free and overall recall. The sample is part of a larger national sample (1342 participants) used to validate an Arabic version of the Mini-Mental State Examination already reported. Reproducibility, sensitivity, specificity, and area under the curve of the A-TNI93 (GTD-USJ) scoring to detect cognitive impairment according to Clinical Dementia Rating (CDR) as the gold standard were measured. Normative data were established among 188 cognitively normal participants.

RESULTS

A threshold score of six on free recall (FR) provided a sensitivity of 66.7% and a specificity of 90.5%. The area under the curve was 0.93. By taking either scores, that is, a FR ≤ 6 or a total recall ≤ 8, the A-TNI93 (GTD-USJ) slightly improved dementia case detection with a sensitivity of 70.8% and a specificity of 88%. Normative data illustrate the distribution of cognitive performance among illiterate older adults.

CONCLUSIONS

Compared to the CDR requiring physician's competence, the A-TNI93 (GTD-USJ) is a valid Arabic adaptation to screen for cognitive impairment among illiterate Lebanese older adults.

Higher literacy is associated with better white matter integrity and cognition in middle age

Introduction

Literacy can be a better measure of quality of education. Its association with brain health in midlife has not been thoroughly investigated.

Methods

We studied, cross-sectionally, 616 middle-aged adults (mean age of 55.1 ± 3.6 years, 53% female and 38% Black) from the Coronary Artery Risk Development in Young Adults (CARDIA) study. We correlated literacy with cognitive tests, gray matter volumes, and fractional anisotropy (FA) values (indirect measures of white matter integrity) using linear regression.

Results

The higher-literacy group (n = 499) performed better than the low-literacy group (n = 117) on all cognitive tests. There was no association between literacy and gray matter volumes. The higher-literacy group had greater total-brain FA and higher temporal, parietal, and occipital FA values after multivariable adjustments.

Discussion

Higher literacy is associated with higher white matter integrity as well as with better cognitive performance in middle-aged adults. These results highlight the importance of focusing on midlife interventions to improve literacy skills.

Eliminating racial disparities in dementia risk by equalizing education quality: A sensitivity analysis

BACKGROUND

Higher risk of dementia among racial/ethnic minorities compared to White populations in the U.S. has been attributed to life-course exposures to adverse conditions such as lower educational attainment, but most studies have not considered additional disparities in education quality. We sought to determine the extent to which disparities in dementia would be reduced had different racial groups received the same quality of education, with no change to present disparities in educational attainment.

METHODS

We conducted a literature review to assess whether and how measures of educational attainment and quality are utilized in the development of norms for standard cognitive screening measures. In a separate search of the literature, we identified estimates of relationships between race, education quality and dementia; and calculated the adjusted association between race and dementia had education quality been equalized between Black and White participants.

RESULTS

Most norms for cognitive measures included educational attainment, but few addressed quality. Our search identified relevant parameter estimates: 44.3% of Black participants and 10.5% of White participants had "limited literacy" (<9th grade reading level, a potential marker of poor education quality), which was associated with a 53% greater hazard of dementia compared with "adequate literacy" (≥ 9th grade reading level) after adjusting for educational attainment. Applying these parameters to a hazard ratio of 1.37 (95%CI: 1.12,1.67) for the risk of dementia comparing Black to White participants, we obtained an adjusted hazard ratio of 1.17 (0.96,1.43), a 54% reduction.

DISCUSSION

Present studies are limited in their consideration of education quality. Our work using available measures from the literature suggests that if education quality were equalized across groups by race, without changing disparities in attainment, racial disparities in dementia would be reduced by about half. Future work should seek to consistently incorporate education quality in order to better understand the sources of disparities.

Development of health literacy in persons and caregivers living with dementia: A qualitative directed content analysis

BACKGROUND

Persons living with dementia and their caregivers need health information to understand and manage daily life. Previous studies focused on the associations of health literacy and cognitive impairment with less exploring if and how individuals develop health literacy during the course of the disease.

PURPOSE

This descriptive qualitative study aimed to explore the development of health literacy competencies among persons living with dementia and their caregivers.

METHODS

Directed content analysis of six focus groups conducted in the community setting (15 persons living with dementia and 28 caregivers) was completed, using predetermined categories from the Integrated Model of Health Literacy: access, understand, appraise, and apply health information.

FINDINGS

Participants described developing health literacy competencies over time, moving from a dependence on health care providers to becoming their own experts. Although health care providers were involved in the diagnosis and medication management, most participants admitted that they provided very little information on how to manage their daily life with dementia and often failed to inform them of community resources.

CONCLUSION

Participants seemed to find dementia resources on their own for both education and support, often stumbling upon them by accident. Health care providers should promote the health literacy competencies of their patients and caregivers by more intentionally providing dementia health and community resource information.

Relation of Literacy and Music Literacy to Dementia in Older Black and White Brazilians

BACKGROUND

Literacy is more consistently reported than education as protective against dementia in developing regions.

OBJECTIVE

To study the association of verbal literacy, numeracy, and music literacy with dementia in older Black and White Brazilians with a broad spectrum of education.

METHODS

We studied 1,818 Black, Mixed-race, and White deceased Brazilians 65 years or older at death (mean = 79.64). Data were retrospectively obtained within 36 hours after death in a face-to-face interview with an informant, usually a family member. Dementia was classified using the Clinical Dementia Rating (CDR) scale. Three forms of literacy were ascertained: verbal literacy (10 questions: reading and writing), numeracy (3 questions: multiplication, percentages, and use of a calculator), and music literacy (1 question: reading music). Black (11%) and Mixed-race (23%) older adults were combined in analyses. Models adjusted for age and sex.

RESULTS

Dementia was identified in 531 people. Participants had 0 to 25 years of education (median = 4). More literacy was associated with lower odds of dementia (all p≤0.039). Participants that read music had about half the odds of having dementia. Participants in the highest quartile of numeracy and verbal literacy had respectively 27%and 15%lower odds of having dementia compared to the lowest quartile. Literacy was lower in Blacks (p < 0.001, except music p = 0.894) but the effect of literacy on dementia was similar (interaction p > 0.237). In secondary analyses, playing instruments without reading music was not associated with dementia (p = 0.887).

CONCLUSION

In a large sample of Brazilians, verbal literacy, numeracy, and music literacy were associated with lower odds of dementia. The effect was similar across races.

Aging and Functional Health Literacy: A Population-based Study

OBJECTIVES

To investigate functional health literacy and its associated factors among older adults drawn from a disadvantaged area.

DESIGN

Cross-sectional epidemiologic study.

SETTING

Population-based cohort randomly selected from the voter registration lists.

PARTICIPANTS

Individuals aged 65+ (N=1066).

MEASUREMENTS

The Short Test of Functional Health Literacy in Adults (S-TOFHLA); demographics; self-rated health; number of prescription drugs; modified Center for Epidemiologic Studies- Depression scale; Mini-Mental State Examination; Wechsler Test of Adult Reading; Clinical Dementia Rating; cognitive domain composite scores; independence in Instrumental Activities of Daily Living and medication management; health services utilization (emergency/urgent care visits and hospitalizations).

RESULTS

Low (inadequate or marginal) S-TOFHLA scores were obtained by 7.04% of the sample. In unadjusted analyses, participants with low S-TOFHLA scores were significantly more likely than those with higher scores to be older, male, non-White, with lesser education and lower household income, to have lower scores on the Wechsler Test of Adult Reading, the Mini-Mental State Examination, and all cognitive domains; to be more dependent in Instrumental Activities of Daily Living and be taking more prescription drugs. In a multiple regression model including all covariates, only older age, male sex, and lower reading level were independently associated with inadequate or marginal S-TOFHLA scores.

CONCLUSION

In a population-based sample of older adults, low functional health literacy was associated with age, sex, education, and reading ability. Basic functional health literacy is essential for understanding health information and instructions. Clinicians should formally or informally assess health literacy in their older patients to ensure effective communication and enhance health outcomes.

Verbal intelligence is a more robust cross-sectional measure of cognitive reserve than level of education in healthy older adults

BACKGROUND

Cognitive reserve is most commonly measured using socio-behavioural proxy variables. These variables are easy to collect, have a straightforward interpretation, and are widely associated with reduced risk of dementia and cognitive decline in epidemiological studies. However, the specific proxies vary across studies and have rarely been assessed in complete models of cognitive reserve (i.e. alongside both a measure of cognitive outcome and a measure of brain structure). Complete models can test independent associations between proxies and cognitive function in addition to the moderation effect of proxies on the brain-cognition relationship. Consequently, there is insufficient empirical evidence guiding the choice of proxy measures of cognitive reserve and poor comparability across studies.

METHOD

In a cross-sectional study, we assessed the validity of 5 common proxies (education, occupational complexity, verbal intelligence, leisure activities, and exercise) and all possible combinations of these proxies in 2 separate community-dwelling older adult cohorts: The Irish Longitudinal Study on Ageing (TILDA; N = 313, mean age = 68.9 years, range = 54-88) and the Cognitive Reserve/Reference Ability Neural Network Study (CR/RANN; N = 234, mean age = 64.49 years, range = 50-80). Fifteen models were created with 3 brain structure variables (grey matter volume, hippocampal volume, and mean cortical thickness) and 5 cognitive variables (verbal fluency, processing speed, executive function, episodic memory, and global cognition).

RESULTS

No moderation effects were observed. There were robust positive associations with cognitive function, independent of brain structure, for 2 individual proxies (verbal intelligence and education) and 16 composites (i.e. combinations of proxies). Verbal intelligence was statistically significant in all models. Education was significant only in models with executive function as the cognitive outcome variable. Three robust composites were observed in more than two-thirds of brain-cognition models: the composites of (1) occupational complexity and verbal intelligence, (2) education and verbal intelligence, and (3) education, occupational complexity, and verbal intelligence. However, no composite had larger average effects nor was more robust than verbal intelligence alone.

CONCLUSION

These results support the use of verbal intelligence as a proxy measure of CR in cross-sectional studies of cognitively healthy older adults.

Home Visit Based Mindfulness Intervention for Vietnamese American Dementia Family Caregivers: A Pilot Feasibility Study

Background: Healthcare disparities continue to exist among the Vietnamese American (VA) community and many factors (e.g., fear of social stigma) deter family caregivers of persons with dementia (PWD) from seeking assistance.

Purpose: To pilot-test a language-specific and culturally appropriate mindfulness intervention to improve dementia VA family caregiver well-being.

Methods: Bilingual, trained research assistants administered a mindfulness exercise (i.e., deep breathing) to family caregivers and provided continuous support and care resources through weekly home visits for a month. Weekly surveys measured changes in emotion, feelings of connectedness to the PWD, and mood (i.e., happiness) before and after the intervention.

Results: A total of nine VA family caregivers of PWD participated in this pilot study. Positive affect showed an increasing trend (M_pre = 16.0 (SD = 3.48), M_post = 17.1 (SD = 3.06)) and negative affect showed a decreasing trend (M_pre = 6.44 (SD = 3.31), M_post = 5.22 (SD = 0.359)). Happiness showed an increasing trend (M_pre = 4.30 (SD = 0.767), M_post = 4.44 (SD = 0.873)).

Conclusions: These findings suggest that a home-based dementia family caregiver intervention with mindfulness exercises may potentially increase positive affect and decrease negative affect in Vietnamese American family caregivers of PWD. Similar interventions may help reduce caregiver burden in dementia family caregivers of other cultures.

Association of Leisure Activities With Cognitive Impairment and Dementia in Older Adults in Colombia: A SABE-Based Study

Observational and interventional studies suggest that participation in leisure activities may help protect against cognitive decline in older people. This study aimed to examine the association between participation in leisure activities and cognitive impairment in older adults in Colombia. Data for this study were derived from the Colombian National Survey of Aging (SABE 2015), a cross-sectional survey with a sample size of 23,694 older adults representing the total population (mean age, 70.8 years; 57.3% females). Cognitive impairment was classified as cognitive impairment without dementia (CIWD) and dementia, according to the revised version of the Folstein Mini-Mental State Examination and the Lawton and Brody functional scale. Leisure activities were evaluated using six items of a questionnaire. Sex-stratified multinomial regression models were used to analyze the association of leisure activities with CIWD and dementia after adjusting for educational attainment, literacy, and other potential confounders. In adjusted models for men, leisure activities in later life were associated with a decreased risk of CIWD (odds ratio [OR], 0.73; 95% confidence interval [CI], 0.68-0.78) and dementia (OR, 0,52; 95% CI, 0.48-0.58). For women, leisure activities in later life were associated with a decreased risk of CIWD (OR, 0.72; 95% CI, 0.66-0.78) and dementia (OR, 0.48; 95% CI, 0.43-0.53). The findings suggest that greater participation in leisure activities in later life may act as a protective factor against CIWD and dementia among older adults in Colombia, independent of educational attainment and literacy.

What does (low) education mean in terms of dementia risk? A systematic review and meta-analysis highlighting inconsistency in measuring and operationalising education

Low education is considered an important modifiable risk factor for dementia worldwide, despite the lack of a formal consensus definition of low education. The primary aim of this systematic review was to document and address the inconsistency in measuring and operationalising education in dementia studies. A secondary aim was to consider the dose of education required to reduce dementia risk. The protocol was registered at PROSPERO with registration ID CRD42018096168. CINAHL, Cochrane, PsycInfo, and Pubmed databases were searched using terms related to education, dementia and/or MCI, and incidence. Studies were eligible for inclusion if a risk ratio for education and any dementia, Alzheimer's Disease (AD), Vascular Dementia (VaD) or Mild Cognitive Impairment (MCI) was reported in a population cognitively healthy at baseline. Sample sizes for 65 studies meeting selection criteria ranged from 152 to 12,881, representing populations from 24 countries. Risk of bias, assessed using a tool designed specifically for dementia risk studies, was found to be medium or low for all studies. There were 23 continuous, 29 dichotomous, and 31 categorical operationalisations of education reported. Random effects meta-analyses from continuous operationalisations suggested each year of education reduced risk by eight percent for AD (95% CI:5-12%) and seven percent for any dementia (95% CI:6-9%). Dichotomous operationalisations indicated an increased risk for low education of 45% (95% CI:29-63%) for any dementia and 85% (95% CI:56-118%) for AD, however definitions of low education were heterogeneous, ranging from zero to 12 years. There were too few studies to produce summary ratios for VaD or MCI. We conclude that, while the evidence of an association between low education and dementia incidence is robust, inconsistency in the definition, measurement and operationalisation of education hinders the translation of this evidence into practical policy recommendations to reduce dementia risk.

The Associations Among Health-Promoting Lifestyle, eHealth Literacy, and Cognitive Health in Older Chinese Adults: A Cross-Sectional Study

Background: Healthy lifestyles and health literacy are strongly associated with cognitive health in older adults, however, it is unclear whether this relationship can be generalized to health-promoting lifestyles and eHealth literacy. To date, no research has examined the interactive effect of health-promoting lifestyles and eHealth literacy on cognitive health. Objective: To examine the associations among health-promoting lifestyles, eHealth literacy, and cognitive health in older adults. Methods: Using a stratified cluster sampling method, we conducted a survey with older adults in four districts and two counties in Jinan (China). Older adults (n = 1201; age ≥ 60 years) completed our survey. We assessed health-promoting lifestyles, eHealth literacy, and cognitive health, and collected participants’ sociodemographic information. Results: Health-promoting lifestyles and eHealth literacy were significantly and positively associated with cognitive health (both p < 0.01). In addition, eHealth literacy was positively associated with health-promoting lifestyles. Moreover, the interaction of health-promoting lifestyle and eHealth literacy negatively predicted cognitive health (β = −0.465, p < 0.01). Conclusions: Health-promoting lifestyles and eHealth literacy were associated with the cognitive health of Chinese older adults, both independently and interactively. Further, eHealth literacy was associated with health-promoting lifestyles in older adults. Therefore, interventions regarding healthy lifestyles and eHealth literacy would benefit older adults.

Genetic Contributions to Health Literacy

Higher health literacy is associated with higher cognitive function and better health. Despite its wide use in medical research, no study has investigated the genetic contributions to health literacy. Using 5783 English Longitudinal Study of Ageing (ELSA) participants (mean age = 65.49, SD = 9.55) who had genotyping data and had completed a health literacy test at wave 2 (2004-2005), we carried out a genome-wide association study (GWAS) of health literacy. We estimated the proportion of variance in health literacy explained by all common single nucleotide polymorphisms (SNPs). Polygenic profile scores were calculated using summary statistics from GWAS of 21 cognitive and health measures. Logistic regression was used to test whether polygenic scores for cognitive and health-related traits were associated with having adequate, compared to limited, health literacy. No SNPs achieved genome-wide significance for association with health literacy. The proportion of variance in health literacy accounted for by common SNPs was 8.5% (SE = 7.2%). Greater odds of having adequate health literacy were associated with a 1 standard deviation higher polygenic score for general cognitive ability [OR = 1.34, 95% CI (1.26, 1.42)], verbal-numerical reasoning [OR = 1.30, 95% CI (1.23, 1.39)], and years of schooling [OR = 1.29, 95% CI (1.21, 1.36)]. Reduced odds of having adequate health literacy were associated with higher polygenic profiles for poorer self-rated health [OR = 0.92, 95% CI (0.87, 0.98)] and schizophrenia [OR = 0.91, 95% CI (0.85, 0.96)). The well-documented associations between health literacy, cognitive function and health may partly be due to shared genetic etiology. Larger studies are required to obtain accurate estimates of SNP-based heritability and to discover specific health literacy-associated genetic variants.

State inequality, socioeconomic position and subjective cognitive decline in the United States

BACKGROUND

Social gradients in health have been observed for many health conditions and are suggested to operate through the effects of status anxiety. However, the gradient between education and Alzheimer's disease is presumed to operate through cognitive stimulation. We examined the possible role of status anxiety through testing for state-level income inequality and social gradients in markers of socioeconomic position (SEP) for Alzheimer's disease risk.

METHODS

Using data from the cross-sectional 2015 and 2016 Behavioral Risk Factor Surveillance System (BRFSS) and the U.S. Census Bureau's American Community Survey, we tested for the association between U.S. state-level income inequality and individual SEP on subjective cognitive decline (SCD) - a marker of dementia risk - using a generalized estimating equation and clustering by state.

RESULTS

State income inequality was not significantly associated with SCD in our multivariable model (OR 1.2; 95% CI: 0.9, 1.6; p=0.49). We observed a clear linear relationship between household income and SCD where those with an annual household income of 50k to 75k had 1.4 (95% CI: 1.3, 1.6) times the odds and those with household incomes of less than $10,000 had 4.7 (95% CI: 3.8, 5.7) times the odds of SCD compared to those with household income of more than $75,000. We also found that college graduates (ref.) and those who completed high school (OR: 1.1; 95% CI 1.04, 1.2) fared better than those with some college (OR: 1.3, 95% CI 1.2, 1.4) or less than a high school degree (OR: 1.5; 95% CI: 1.4, 1.7).

CONCLUSIONS

Income inequality does not play a dominant role in SCD, though a social gradient in individual income for SCD suggests the relationship may operate in part via status anxiety.

The Cretan Aging Cohort: Cohort Description and Burden of Dementia and Mild Cognitive Impairment

Our aim was to explore the burden of dementia in the Cretan Aging Cohort, comprised of 3140 persons aged ≥60 years (56.8% women, 5.8 ± 3.3 years formal education, 86.2% living in rural areas) who attended selected primary health-care facilities on the island of Crete, Greece. In the first study phase, a formal diagnosis of dementia had been reached in 4.0% of the participants. However, when selected 505 participants underwent thorough neuropsychiatric evaluation in the second phase of this study (344 with Mini-Mental State Examination [MMSE] <24 and 161 with MMSE ≥24), and results were extrapolated to the entire cohort, the prevalence of dementia and mild cognitive impairment was estimated at 10.8% (9.7%-11.9%) and 32.4% (30.8%-34.0%), respectively. Using both the field diagnostic data and the extrapolated data, the highest dementia prevalence (27.2%) was found in the 80- to 84-year-old group, who also showed the lowest educational level, apparently due to lack of schooling during World War II.

How Is Literacy Being Defined and Measured in Dementia Research? A Scoping Review

Literacy plays an important role in Alzheimer's disease and related dementias (ADRD); however, less is known about how literacy is being used and defined in ADRD studies. This study reviewed terminology being used to describe types and definitions of literacy and instruments used to assess literacy in ADRD research. Among the 219 studies retrieved from 3 databases, 50 met our inclusion criteria. Literacy terms used in ADRD studies varied: literacy (n = 28), health literacy (n = 9), and dementia literacy (n = 7) were the most often used terms, followed by financial literacy (n = 4), dementia knowledge (n = 3), AD knowledge (n = 2), mental health literacy (n = 2), AD literacy, digital literacy, health literacy about incontinence, and financial knowledge (n = 1 each). Thirty studies did not define literacy terms used. Among the 20 studies defining literacy, definitions were inconsistent across studies even when they used the same term. Surveys (n = 30), open-ended questions, vignettes, or focus groups (n = 10), self-perceived (n = 3) or interviewer assessed (n = 1) literacy levels were used to assess literacy. Ten studies did not specify literacy measurement. Various literacies have been examined in ADRD research with unclear definitions and some inadequate measures. Well-defined terms with valid measures are needed to better understand the role of literacies in ADRD research.

Occupational cognitive complexity in earlier adulthood is associated with brain structure and cognitive health in midlife: The CARDIA study

OBJECTIVE

In line with cognitive reserve theory, higher occupational cognitive complexity is associated with reduced cognitive decline in older adulthood. How and when occupational cognitive complexity first exerts protective effects during the life span remains unclear. We investigated associations between occupational cognitive complexity during early to midadulthood and brain structure and cognition in midlife.

METHOD

Participants were 669 adults from the Coronary Artery Risk Development in Young Adults study (aged 18-30 years at baseline, 52% female, 38% Black). We calculated scores reflecting occupational cognitive complexity using Census Occupation Codes (years 10 and 15) and Occupational Information Network (O*NET) data. At year 25, participants had structural brain magnetic resonance imaging, diffusion tensor imaging, and cognitive testing (Rey Auditory Verbal Learning Test, Digit Symbol Substitution Test, Stroop). In adjusted mixed models, we examined associations between occupational cognitive complexity during early to midadulthood and midlife brain structure, specifically gray matter volume and white matter fractional anisotropy, and cognition in midlife (all outcomes converted to z-scores).

RESULTS

Higher occupational cognitive complexity was associated with greater white matter fractional anisotropy (estimate = 0.10, p = .01) but not gray matter volume. Higher occupational cognitive complexity was associated with better Digit Symbol Substitution Test (estimate = 0.13, p < .001) and Stroop (estimate = 0.09, p = .01) performance but not Rey Auditory Verbal Learning Test performance.

CONCLUSIONS

Occupational cognitive complexity earlier in adulthood is associated with better white matter integrity, processing speed, and executive function in midlife. These associations may capture how occupational cognitive complexity contributes to cognitive reserve. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Decision-Making Based on Social Conventional Rules by Elderly People

Information used by older adults engaging in a social decision making task of judging a protagonist as a good or a bad person was investigated. Older (n = 100, 50 women, mean age = 63.6 years) and younger (n = 100, 50 women, mean age = 25.7 years) adults participated in a web-based survey. In Experiment 1, we assessed participants’ rapid decision-making processes when making good or bad judgments after reading consecutive sentences without reviewing previously read sentences. The percentages of good judgments were analyzed. In Experiment 2, two protagonists engaging in a deliberate decision-making process were presented, and participants were asked to judge better and worse protagonists. The percentages of behavior-based judgments were analyzed. Results of Experiment 1 indicated that older adults judged protagonists as “good” more often than younger adults. Especially, older adults judged protagonists with good behavior as being “good.” In Experiment 2, older adults made behavior-based judgments more than younger people. Additionally, older and younger adults used information on personalities of protagonists for making judgments in situations with bad outcomes, or incongruent. Moreover, multiple regression analysis suggested that people with more general trust engaged more, whereas people with more caution engaged less in making behavior-based judgments.

Prevalence and correlates of subjective memory complaints in Vietnamese adults

ABSTRACTBackground:Low- and middle-income countries such as Vietnam are home to a majority of the world's population with dementia, yet little is known regarding how individuals in these countries perceive memory problems that might be indicative of cognitive impairment. This study examined the prevalence and correlates of subjective memory complaints (SMCs) in Vietnamese adults in Da Nang, Vietnam.

METHODS

A stratified sample of 600 adults (aged ≥ 55 years) living in Da Nang, Vietnam, and surrounding areas were recruited to participate in a cross-sectional study. Students and faculty from the National Technical Medical College Number 2 administered questionnaires in participants' homes regarding socio-demographic characteristics, functional health, social support, cognitive and mental health, and SMCs. Descriptive and stepwise regression analyses examined the prevalence and correlates of SMCs.

RESULTS

Approximately 64% of the sample reported at least poor memory and 39% said that memory interfered with their daily life at least somewhat. Multivariate regression analyses (adjusted for all covariates) showed that depressive symptoms, cognitive impairment, self-rated health and pain, and material hardship were associated with SMCs.

CONCLUSIONS

Prevalence of SMCs as well as depressive symptoms was high in this Vietnamese population. Although future research using more detailed measures of subjective memory and which include longitudinal data are required, the need for physicians to routinely assess Vietnamese patients for depression, SMCs, and cognitive impairment may be warranted.

Financial and Health Literacy Predict Incident Alzheimer's Disease Dementia and Pathology

BACKGROUND

Domain specific literacy is a multidimensional construct that requires multiple resources including cognitive and non-cognitive factors.

OBJECTIVE

We test the hypothesis that domain specific literacy is associated with Alzheimer's disease (AD) dementia and AD pathology after controlling for cognition.

METHODS

Participants were community-based older persons who completed a baseline literacy assessment, underwent annual clinical evaluations for up to 8 years, and agreed to organ donation after death. Financial and health literacy was measured using 32 questions and cognition was measured using 19 tests. Annual diagnosis of AD dementia followed standard criteria. AD pathology was examined postmortem by quantifying plaques and tangles. Cox models examined the association of literacy with incident AD dementia. Performance of model prediction for incident AD dementia was assessed using indices for integrated discrimination improvement and continuous net reclassification improvement. Linear regression models examined the independent association of literacy with AD pathology in autopsied participants.

RESULTS

All 805 participants were free of dementia at baseline and 102 (12.7%) developed AD dementia during the follow-up. Lower literacy was associated with higher risk for incident AD dementia (p < 0.001), and the association persisted after controlling for cognition (hazard ratio = 1.50, p = 0.004). The model including the literacy measure had better predictive performance than the one with demographics and cognition only. Lower literacy also was associated with higher burden of AD pathology after controlling for cognition (β= 0.07, p = 0.035).

CONCLUSION

Literacy predicts incident AD dementia and AD pathology in community-dwelling older persons, and the association is independent of traditional measures of cognition.

Impacts of Illiteracy on the Risk of Dementia: A Global Health Perspective

Despite its significance as a contributing factor for late-life dementia risk, illiteracy is frequently underappreciated in the management of dementia. In this study, we estimated the proportion of dementia cases attributable to illiteracy using the population attributable fraction (PAF), and calculated to what extent the monetary cost of dementia could be saved in the future by reducing illiteracy from the South Korean, Latin American, South Asian/Middle Eastern, and African populations. We collected necessary data from the 2011 United Nations Human Development Report and prevalence studies conducted in these regions. Additional variables not included in the above sources were estimated using a logit model under a "trend scenario"-based assumption. Around 16% of the total number of dementia cases in South Korea in 2015 can be attributed to illiteracy, with this figure predicted to decline to around 2% by 2050. This translates to a saving in dementia care costs of approximately 52 billion USD, providing we are successful in theoretically eradicating illiteracy as of 2015, in the population aged 65 years or under. Likewise, reducing illiteracy to 50% in Latin America, South Asia/The Middle East, and Africa by 2050 could generate further cost savings of between 71 and 244 billion, 13 and 94 billion, and 17 and 78 billion USD, respectively. Even public policies aimed solely at reducing illiteracy in the childhood, adolescent, or middle-aged population could potentially have a role in the primary prevention of dementia. Moving forward, governments will need to address this issue in a purposeful and systematic manner.

Defining Optimal Brain Health in Adults: A Presidential Advisory From the American Heart Association/American Stroke Association

Cognitive function is an important component of aging and predicts quality of life, functional independence, and risk of institutionalization. Advances in our understanding of the role of cardiovascular risks have shown them to be closely associated with cognitive impairment and dementia. Because many cardiovascular risks are modifiable, it may be possible to maintain brain health and to prevent dementia in later life. The purpose of this American Heart Association (AHA)/American Stroke Association presidential advisory is to provide an initial definition of optimal brain health in adults and guidance on how to maintain brain health. We identify metrics to define optimal brain health in adults based on inclusion of factors that could be measured, monitored, and modified. From these practical considerations, we identified 7 metrics to define optimal brain health in adults that originated from AHA's Life's Simple 7: 4 ideal health behaviors (nonsmoking, physical activity at goal levels, healthy diet consistent with current guideline levels, and body mass index <25 kg/m2) and 3 ideal health factors (untreated blood pressure <120/<80 mm Hg, untreated total cholesterol <200 mg/dL, and fasting blood glucose <100 mg/dL). In addition, in relation to maintenance of cognitive health, we recommend following previously published guidance from the AHA/American Stroke Association, Institute of Medicine, and Alzheimer's Association that incorporates control of cardiovascular risks and suggest social engagement and other related strategies. We define optimal brain health but recognize that the truly ideal circumstance may be uncommon because there is a continuum of brain health as demonstrated by AHA's Life's Simple 7. Therefore, there is opportunity to improve brain health through primordial prevention and other interventions. Furthermore, although cardiovascular risks align well with brain health, we acknowledge that other factors differing from those related to cardiovascular health may drive cognitive health. Defining optimal brain health in adults and its maintenance is consistent with the AHA's Strategic Impact Goal to improve cardiovascular health of all Americans by 20% and to reduce deaths resulting from cardiovascular disease and stroke by 20% by the year 2020. This work in defining optimal brain health in adults serves to provide the AHA/American Stroke Association with a foundation for a new strategic direction going forward in cardiovascular health promotion and disease prevention.

Decline in Literacy and Incident AD Dementia Among Community-Dwelling Older Persons

OBJECTIVE

To quantify longitudinal change in financial and health literacy and examine the associations of declining literacy with incident Alzheimer's disease (AD) dementia and mild cognitive impairment (MCI).

METHOD

Data came from 799 participants of an ongoing cohort study. Literacy was measured using a battery of 32 questions. Clinical diagnoses were made annually following uniform structured procedures. The associations of declining literacy with incident AD dementia and MCI were tested using a joint model for longitudinal and time-to-event data.

RESULTS

We observed an overall decline in total literacy score over up to 6 years of follow-up ( p < .001). Faster decline in literacy was associated with higher risks for incident AD dementia (hazard ratio = 4.526, 95% confidence interval = [2.993, 6.843], p < .001) and incident MCI (hazard ratio = 2.971, 95% confidence interval = [1.509, 5.849], p = .002).

DISCUSSION

Declining literacy among community-dwelling older persons predicts adverse cognitive outcomes and serves as an early indicator of impending dementia.

Association of financial and health literacy with cognitive health in old age

We tested the hypothesis that higher financial and health literacy is associated with better cognitive health in 755 older persons who completed a literacy measure (M = 67.9, SD = 14.5) and then had annual clinical evaluations for a mean of 3.4 years. In proportional hazards models, higher literacy was associated with decreased risk of developing incident Alzheimer's disease (n = 68) and results were similar for financial and health literacy subscales and after adjustment for potential confounders. In mixed-effects models, higher literacy was related to higher baseline level of cognition and reduced cognitive decline in multiple domains. Among the 602 persons without any cognitive impairment at baseline, higher literacy was associated with a reduced rate of cognitive decline and risk of developing incident mild cognitive impairment (n = 142). The results suggest that higher levels of financial and health literacy are associated with maintenance of cognitive health in old age.

Trajectories of Depressive Symptoms in Older Adults and Risk of Dementia

IMPORTANCE

Depression has been identified as a risk factor for dementia. However, most studies have measured depressive symptoms at only one time point, and older adults may show different patterns of depressive symptoms over time.

OBJECTIVE

To investigate the association between trajectories of depressive symptoms and risk of dementia in older adults.

DESIGN, SETTING, AND PARTICIPANTS

This was a prospective cohort investigation of black and white community-dwelling older adults in the Health, Aging, and Body Composition study. Participants were enrolled between May 1997 and June 1998 and followed up through 2001-2002. The dates of this analysis were September 2014 to December 2015. The setting was community research centers in Memphis, Tennessee, and Pittsburgh, Pennsylvania. Trajectories of depressive symptoms were assessed from baseline to year 5. Symptoms were measured with the Center for Epidemiologic Studies Depression Scale Short Form, and trajectories were calculated using latent class growth curve analysis.

MAIN OUTCOMES AND MEASURES

Incident dementia through year 11, determined by dementia medication use, hospital records, or significant cognitive decline (≥1.5 SD race-specific decline on the Modified Mini-Mental State Examination). We examined the association between depressive symptom trajectories and dementia incidence using Cox proportional hazards regression models adjusted for demographics, health factors that differed between groups, and cognition during the depressive symptom assessment period (baseline to year 5).

RESULTS

The analytic cohort included 2488 black and white older adults with repeated depressive symptom assessments from baseline to year 5 who were free of dementia throughout that period. Their mean (SD) age at baseline was 74.0 (2.8) years, and 53.1% (n = 1322) were female. The following 3 depressive symptom trajectories were identified: consistently minimal symptoms (62.0% [n = 1542] of participants), moderate and increasing symptoms (32.2% [n = 801] of participants), and high and increasing symptoms (5.8% [n = 145] of participants). Compared with the consistently minimal trajectory, having a high and increasing depressive symptom trajectory was associated with significantly increased risk of dementia (fully adjusted hazard ratio, 1.94; 95% CI, 1.30-2.90), while the moderate and increasing trajectory was not associated with risk of dementia after full adjustment. Sensitivity analyses indicated that the high and increasing trajectory was associated with dementia incidence, while depressive symptoms at individual time points were not.

CONCLUSIONS AND RELEVANCE

Older adults with a longitudinal pattern of high and increasing depressive symptoms are at high risk for dementia. Individuals' trajectory of depressive symptoms may inform dementia risk more accurately than one-time assessment of depressive symptoms.

The Potential for Literacy to Shape Lifelong Cognitive Health

In light of population aging, an understanding of factors that promote lifelong cognitive resilience is urgent. There is considerable evidence that education early in the life span, which promotes the development of literacy skills, leads to cognitive health and longevity, but the ways in which activity engagement in later adulthood affects long-term cognitive health is not well understood. The literature on cognitive training focusing on ability and skill training has not only demonstrated the existence of plasticity into late life but also shows that improvements are very tightly tied to the abilities trained. The rush to apply ability training to promote cognitive health has produced a vibrant “brain training” industry that neglects the very limited evidence for transfer to significant functional outcomes. Recent evidence on the neural substrates of reading, language comprehension, and discourse processing, as well as on the lifelong effects of literacy engagement in special populations, hints that reading may well be a “whole-brain exercise” with the potential to promote cognitive health. Such findings suggest promise for education-based approaches to promote lifelong cognitive health, calling for (a) societal investment in science at the interface of education and health, in particular to understand the mechanisms through which literacy engagement affects mind, brain, and physical health through the life span, and (b) innovation in developing models of life span education.

Trajectories of peripheral interleukin-6, structure of the hippocampus, and cognitive impairment over 14 years in older adults

We aimed to investigate if trajectory components (baseline level, slope, and variability) of peripheral interleukin-6 (IL-6) over time were related to cognitive impairment and smaller hippocampal volume and if hippocampal volume explained the associations between IL-6 and cognitive impairment. Multivariable regression models were used to test the association between IL-6 trajectory components with change in neuroimaging measures of the hippocampus and with cognitive impairment among 135 older adults (70-79 years at baseline) from the Healthy Brain Project over 14 years. IL-6 variability was positively associated with cognitive impairment (odds ratio [OR] = 5.86, 95% confidence interval [CI]: 1.24, 27.61) and with greater decrease per year of gray matter volume of the hippocampus (β = -0.008, standard error = 0.004, p = 0.03). After adjustment for hippocampal volume, the OR of cognitive impairment decreased for each unit of IL-6 variability and CIs widened (OR = 4.36, 95% CI: 0.67, 28.29). Neither baseline levels nor slopes of IL-6 were related to cognitive impairment or hippocampal volume. We believe this has potential clinical and public health implications by suggesting adults with stable levels of peripheral IL-6 may be better targets for intervention studies for slowing or preventing cognitive decline.

The impact of health literacy in the care of surgical patients: a qualitative systematic review

BACKGROUND

Inadequate health literacy affects more than 90 million Americans and it has been associated with adverse outcomes in the medicine field including increased hospitalization rates and greater mortality. Since surgical patients are often required to make complex decisions and adhere to complex instructions, health literacy may have a profound impact in the surgical practice. The main objective of the current study was to systematically evaluate the role of health literacy in surgical patients.

METHODS

A systematic search was performed to identify studies that evaluated the role of health literacy in the perioperative setting following the PRISMA guidelines. Only studies that examined health literacy using a validated instrument in the perioperative setting were included.

RESULTS

Ten studies including data on 1147 patients were included. The median (IQR) number of patients in the included studies was 101 (30 to 152). The majority of studies used the Short Test of Functional Literacy in adults (STOFHLA) to evaluate patients' health literacy. Five studies evaluated the patients preoperatively, four studies evaluated patients in the postoperative period and in one study the time of evaluation in relation to the surgical procedure was not defined. The lowest prevalence of inadequate health literacy was detected in kidney transplant patients, 6 out of 124 (5 %), while the highest prevalence of inadequate health literacy was detected in orthopedic patients having total joint replacement, 86 out of 126 (60 %). Inadequate health literacy in the preoperative period was associated with poor medical information comprehension and it may adversely affect adherence to preoperative medications and even modulate surgical disparities. Inadequate health literacy in the postoperative period was associated with poor comprehension of discharge instructions and worse kidney function in transplant recipients.

CONCLUSIONS

Health literacy seems to have a very significant impact in the care of surgical patients. More studies to establish the impact of poor health literacy on perioperative outcomes are needed.

Incidence of and risk factors for Alzheimer's disease and mild cognitive impairment in Korean elderly

BACKGROUND/AIMS

Knowledge of incidence rates and risk factors is essential for the development of strategies to treat patients with Alzheimer's disease (AD) and mild cognitive impairment (MCI).

METHODS

A subpopulation of the Nationwide Survey on Dementia Epidemiology (460 Korean subjects aged ≥65 years from 2 rural and 2 urban districts) was followed up for 3.5 years. The age-specific incidence was estimated and risk factors were identified.

RESULTS

The age-standardized incidence of AD and MCI was 7.9 and 28.1 cases per 1,000 person-years, respectively. MCI was associated with a 6-fold increased risk of AD. Depression was a risk factor for AD with MCI. Age, lack of formal education, illiteracy, rural residence, and marital status were associated with the risk of AD.

CONCLUSION

Strategies to control modifiable risk factors should be implemented to decrease the incidence of AD.