The effect of educational attainment on cognition of older adults: results from the Mexican Health and Aging Study 2001 and 2012.

Objective: This paper seeks to document changes in the effect of educational attainment on cognitive function of older adults in Mexico, and measure gender differences using data from two time periods. Methods: The data come from the Mexican Health and Aging Study (MHAS), taking the cross-sections of adults aged 60 years or older interviewed in 2001 and 2012. We perform an OLS regression using standardized z-scores for five individual cognitive domains and for total cognition. Results: Total cognitive scores and educational attainment were higher for men than women in both years. When cognitive components were analyzed separately, women had higher verbal memory and verbal recall scores than men. The gender gap in overall cognition score was smaller in 2012 compared to 2001, while the gender gap in educational attainment was larger in 2012 than in 2001. Even though men had higher educational attainment than women, the effect of educational attainment on cognition was higher for women. Similarly, the difference between total scores for each task for men compared to women decreased between 2012 and 2001, except for verbal learning and verbal recall where the gender difference widened. Conclusions: If younger cohorts of women continue to progressively achieve higher levels of education, the gender gap in old-age cognition should close. Additional work should determine the mechanisms through which added formal education seems to translate into higher cognitive gains for women compared to men.

Cross-national health comparisons using the Rasch model: findings from the 2012 US Health and Retirement Study and the 2012 Mexican Health and Aging Study.

PURPOSE: Cross-national comparisons of patterns of population aging have emerged as comparable national micro-data have become available. This study creates a metric using Rasch analysis and determines the health of American and Mexican older adult populations. METHODS: Secondary data analysis using representative samples aged 50 and older from 2012 U.S. Health and Retirement Study (n = 20,554); 2012 Mexican Health and Aging Study (n = 14,448). We developed a function measurement scale using Rasch analysis of 22 daily tasks and physical function questions. We tested psychometrics of the scale including factor analysis, fit statistics, internal consistency, and item difficulty. We investigated differences in function using multiple linear regression controlling for demographics. Lastly, we conducted subgroup analyses for chronic conditions. RESULTS: The created common metric demonstrated a unidimensional structure with good item fit, an acceptable precision (person reliability = 0.78), and an item difficulty hierarchy. The American adults appeared less functional than adults in Mexico (ß = - 0.26, p < 0.0001) and across two chronic conditions (arthritis, ß = - 0.36; lung problems, ß = - 0.62; all p < 0.05). However, American adults with stroke were more functional than Mexican adults (ß = 0.46, p = 0.047). CONCLUSIONS: The Rasch model indicates that Mexican adults were more functional than Americans at the population level and across two chronic conditions (arthritis and lung problems). Future studies would need to elucidate other factors affecting the function differences between the two countries.

Racial and ethnic differences in cognitive function among older adults in the USA.

OBJECTIVE: Examine differences in cognition between Hispanic, non-Hispanic black (NHB), and non-Hispanic white (NHW) older adults in the United States. DATA/METHODS: The final sample includes 18 982 participants aged 51 or older who received a modified version of the Telephone Interview for Cognitive Status during the 2010 Health and Retirement Study follow-up. Ordinary least squares will be used to examine differences in overall cognition according to race/ethnicity. RESULTS: Hispanics and NHB had lower cognition than NHW for all age groups (51-59, 60-69, 70-79, 80+). Hispanics had higher cognition than NHB for all age groups but these differences were all within one point. The lower cognition among NHB compared to NHW remained significant after controlling for age, gender, and education, whereas the differences in cognition between Hispanics and NHW were no longer significant after controlling for these covariates. Cognitive scores increased with greater educational attainment for all race/ethnic groups, but Hispanics exhibited the least benefit. DISCUSSION: Our results highlight the role of education in race/ethnic differences in cognitive function during old age. Education seems beneficial for cognition in old age for all race/ethnic groups, but Hispanics appear to receive a lower benefit compared to other race/ethnic groups. Further research is needed on the racial and ethnic differences in the pathways of the benefits of educational attainment for late-life cognitive function. Copyright © 2016 John Wiley & Sons, Ltd.

Transitions in activities of daily living in Mexico, 2001-2012.

OBJECTIVE: This paper describes the 2001-2012 progression of limitations in daily activities in the Mexican elderly population aged 60 or older and identifies how sociodemographic and health factors affect these progressions. MATERIALS AND METHODS: Data come from the Mexican Health and Aging Study (MHAS), a national sample of adults born in 1951 or earlier, including a baseline survey in 2001 and follow-ups in 2003 and 2012. RESULTS: Difficulty in getting dressed is the activity that has the highest prevalence in all three waves for both genders. In the 11-year transition, 42.8% of the respondents with no limitations in 2001 reported no limitations in 2012. In contrast, 60.8% of those who reported three or more limitations in 2001 had died by 2012. CONCLUSIONS: With the rapid aging of the Mexican population, the knowledge of patterns of deterioration of functional limitations will prove useful for future public health policies.

Caregiving to Older Adults With a Physical Limitation: Evidence From the Mexican Health and Aging Study.

Background and Objectives: Many older adults face physical limitations to performing activities of daily life (ADLs) and instrumental activities of daily life (IADLs) and seek help performing them. In Mexico, family caregivers, especially spouses and adult children, traditionally take care of older adults. However, a detailed characterization of the care received has not been thoroughly provided. We sought to identify socioeconomic, demographic, and health-related differences in receiving help among older adults reporting physical limitations. Research Design and Methods: Using the 2012 wave of the Mexican Health and Aging Study, we provided information on adults aged 60 and older who reported one or more physical limitations and whether they received help or not. We estimated 2 logistic regression models to obtain the odds ratios (ORs) of receiving help among individuals with an ADL limitation and those with an IADL limitation. Results: Adults with ADL limitations received, on average, approximately 10.7 hr of assistance per day, whereas those with at least 1 IADL limitation received around 7.7 hr of help per day. Women were more likely to receive help with ADLs than men (OR = 2.35). Individuals with chronic conditions such as hypertension, diabetes, and arthritis also received more help with both ADLs and IADLs. Discussion and Implications: Our work suggests that help received does respond to the care needs of older adults, but future research should focus on the burden of care for caregivers and expand this analysis using a longitudinal data approach.

Gender differences in health in Havana versus in Mexico City and in the US Hispanic population.

Health progress in the 1960s and 1970s placed Cuba at the vanguard of longevity in Latin America and the Caribbean. This success has often been attributed to equity of access to the health care system and its cost-effectiveness in the country. Cuba also has a small gender gap in life expectancy. In this study, we examined how this pattern is reflected in the gender differences in health among the population aged 60+ in Havana. We compared gender differences in health in samples drawn from Havana, Mexico City, and the US Hispanic population: three geographic settings with very different political, health care, and social systems. The data come from the Survey on Health, Well-Being, and Aging in Latin America and the Caribbean and the 2000 Health and Retirement Study. Age-adjusted prevalence and logistic regressions were estimated for poor self-rated health, limitations on activities of daily living, depression, and mobility limitations. While an absolute female disadvantage in health was apparent in all three populations, the relative gender differences were inconsistent across all four health domains. Gender differences were most pronounced in Havana, even after adjusting for age, socio-economic status, family characteristics, and smoking behaviour. Despite having higher overall life expectancy and more equitable and universal access to primary care and preventive medicine, women in Havana appear to have a larger burden of ill health than women in less equitable societies. The study provides indirect evidence that Cuba faces challenges in combating the health threats posed by chronic diseases and other diseases and conditions common among the population aged 60+.

Fertility History and Cognitive Function in Late Life: The Case of Mexico.

OBJECTIVES: Mexico is aging rapidly, which makes identification of life-course factors influencing cognition a public health priority. We evaluate how the number of children one has relates to cognition in Mexico, a rapidly aging country that experienced fertility declines across recent cohorts of older people. METHOD: We analyze older adults (age 50+, n = 11,380) from the 2015 Mexican Health and Aging Study. Respondents were categorized by number of children ever born (0-1, 2-3, 4-5, 6+). Using ordinary least squares regression, we estimate independent associations between fertility history and cognition accounting for demographic, socioeconomic, health, and psychosocial factors. RESULTS: We observed an inverse U-shaped relationship between number of children (peaking at 2-3 children) and cognitive function, regardless of gender. In regression analyses adjusted for confounding variables, having 0-1 (vs 2-3 children) was associated with poorer cognitive function only for females. Regardless of gender, having 6+ (vs 2-3 children) was associated with poorer cognitive function. These associations remained significant even after accounting for socioeconomic, health, employment, and psychosocial factors. DISCUSSION: Our results suggest fertility history may play a role in late-life cognitive health and provide evidence that both low and high fertility may relate to poorer cognitive function. We discuss differences by gender.

Recovery from physical limitations among older Mexican adults.

OBJECTIVES: This paper examines the key determinants of the likelihood of recovery from a physical disability among older adults. METHODS: Data come from the Mexican Health and Aging Study (MHAS), a national sample of adults born in 1951 or earlier, including a baseline survey in 2001 and follow-ups in 2003, 2012 and 2015. At baseline, we divided our sample of older adults aged 60+ by dimensions of physical limitations (ADLs, IADLs, mobility) and classified respondents as having physical limitations in zero, one, two or three dimensions. Each respondent was then categorized as "same", "worse", "improved" or "died" depending on the number of physical dimensions with a limitation in a 2-year span (2001-2003) and again, separately, in a 3-year span (2012-2015). We then used a multinomial logistic regression to analyze the relative risk of transitioning from one category to another. FINDINGS: Around 21 % of our sample exhibited some recovery in 2003 and around 20 % recovered in 2015. Age, gender, poor self-rated health, depression and some chronic conditions were significant for shifting the relative risk from staying the same to getting worse, dying or even improving. CONCLUSIONS: Disability from a physical limitation is a reversible and dynamic process. Our results reflect the importance of considering the dimensions of physical ability while analyzing recovery, and illustrate that the presence of a chronic condition or depressive symptoms does not necessarily imply permanent disability.

Association Between Baseline Glycemic Markers (HbA1c) and 8-Year Trajectories of Functional Disability.

BACKGROUND: This study assessed whether baseline (i) HbA1c (low [<5.7%], intermediate [5.7%-6.4%], and high [≥6.5%]) and (ii) glycemic control (7% HbA1c cutoff) in participants with self-reported diabetes were associated with differential 8-year functional disability trajectories. METHODS: We used data from the 2006-2014 waves of the Health and Retirement Study for adults aged 50 years and older. Latent class mixture modeling was used to identify distinct functional disability trajectory classes. Multinomial logistic regression analysis examined the association between the newly constructed trajectories and baseline HbA1c levels, and glycemic control, respectively. RESULTS: All participants (N = 5,966) were classified into four functional disability trajectory classes (no disability, low disability, low-increasing, and high-increasing). Participants with elevated HbA1c were at greater risk of being classified into the high-increasing (relative risk ratios = 1.63, 95% confidence interval [CI] = 1.25-2.11) trajectory class. Results showed significant effect modification by age and race. Three functional disability trajectories (no disability, low-increasing, and high-increasing) were identified for participants with self-reported diabetes (n = 1,119). There was no significant association between glycemic control in adults with self-reported diabetes and functional disability trajectory classes. CONCLUSIONS: Participants with intermediate HbA1c and elevated HbA1c were more likely to be classified into the trajectories with progressing disability over the study period. More research is needed to better understand the association between glycemic markers and functional disability trajectories. Such research may provide insights into improvements for clinical care, self-management, and public health interventions for both conditions.

Differences in the Progression of Disability: A U.S.-Mexico Comparison.

Objectives: This article seeks to document the progression of disability in a developing country by implementing a model to examine how this process compares to a developed country. Methods: Data come from the Mexican Health and Aging Study (MHAS), including a baseline survey in 2001 and a follow-up in 2003, and from the U.S. Health and Retirement Study (HRS), using the 2000 and 2002 waves. An ordinal logistic regression approach is used to examine a progression of disability that considers (a) no disability, (b) mobility problems, (c) mobility plus limitations with instrumental activities of daily living, (d) mobility plus limitations with activities of daily living (ADLs), (e) limitations in all three areas and (f) death. Results: In both data sets, approximately 44% of the sample remained in the same level of disability at the 2-year follow-up. However, the progression of limitations with two disabilities differs by gender in the MHAS but is consistent for both men and women in the HRS. Discussion: Our model reflects the importance of ADLs in the disablement process in Mexico. We speculate that the difference in lifetime risk profiles and cultural context might be responsible for the divergence in the progression of disability by gender.

Family size and old-age wellbeing: effects of the fertility transition in Mexico.

The present study aims to determine how family size affects psycho-social, economic and health wellbeing in old age differently across two cohorts with declining fertility. The data are from the 2012 Mexican Health and Ageing Study (MHAS) including respondents aged 50+ (N = 13,102). Poisson (standard and zero-inflated) and logistic regressions are used to model determinants of wellbeing in old age: psycho-social (depressive symptoms), economic (consumer durables and insurance) and health (chronic conditions). In the younger cohort, having fewer children is associated with fewer depressive symptoms and chronic conditions, and better economic well-being. For the older cohort, having fewer children is associated with lower economic wellbeing and higher odds of being uninsured. Lower fertility benefited the younger cohort (born after 1937), whereas the older cohort (born in 1937 or earlier) benefited from lower fertility only in chronic conditions. Further research is needed to continue exploring the old-age effects of the fertility transition.

Life expectancy with and without cognitive impairment by diabetes status among older Americans.

Diabetes affects mortality and cognitive functioning. It is not known how diabetes influences life expectancy (LE) with and without cognitive impairment. We seek to examine age at onset of cognitive impairment and life expectancy (LE) with and without cognitive impairment by diabetes status among middle- and older-aged Americans. Data come from the U.S. Health and Retirement Study 2000-2012 linked to the National Death Index (N = 13,687). We use multinomial regression models stratified by gender and controlling for age, education and race/ethnicity to estimate diabetes-status specific transition probabilities, then use a Markov chain matrix population model to calculate age at onset of cognitive impairment and LE with and without cognitive impairment by diabetes status at age 50. LE at age 50 was 27.6 (men) and 32.1 (women). From age 50, those with diabetes had a first incidence of cognitive impairment 3 (men) and 4 (women) years earlier than those without. Diabetes reduced total LE by 5-7 years and cognitively healthy LE by 4-6 years. Those with diabetes lived one year less in a cognitively impaired state than those without. Over 80% of the lower LE associated with diabetes is attributable to the loss of cognitively-healthy years. Those with diabetes have a shorter LE with cognitive impairment because of higher mortality. In analyses by educational attainment, education was strongly protective of cognitive health, yet diabetes was associated with lower age of cognitive impairment onset and fewer cognitive healthy years lived in all educational groups. The excess mortality because of diabetes may be decreasing. If the mortality decline is not coupled with a comparable decline in the risk of cognitive impairment, the population level burden of impaired cognition may grow larger.

Trajectories of limitations in activities of daily living among older adults in Mexico, 2001-2012.

BACKGROUND: Trajectories of disability are an essential component to understand the burden of disability at the societal level. Longitudinal studies, compared to cross-national studies, enable a better analysis of the progression of physical limitations among the elderly. However, information on disability dynamics in developing countries is limited. OBJECTIVES: This paper examines the changes in activities of daily living (ADLs) in an 11-yr. period in the Mexican elderly population aged 60 or older and identifies how sociodemographic variables alter these trajectories. METHODS: The data come from the Mexican Health and Aging Study (MHAS), a national sample of adults born in 1951 or earlier, including a baseline survey in 2001 and follow-ups in 2003 and 2012. RESULTS: The ADL score increased on average by 0.03 for every year respondents aged after 60. In contrast, the ADL score was reduced by 0.06 for every additional year of education. CONCLUSIONS: Age, gender, and years of education were confirmed to influence the trajectories of ADL limitations. Understanding the patterns of deterioration of functional limitations will help public health policies to better serve the population.

The progression of disability among older adults in Mexico.

PURPOSE: This paper seeks to document the progression of disability in a developing country and to examine gender differences in this process. METHODS: The data come from the Mexican Health and Aging Study (MHAS), a nationally representative sample of older adults. An ordinal logistic regression (n = 3283) is used to measure the progression of disability that considers: (1) no disability, (2) mobility problems, (3) mobility problems with IADLs limitations, (4) mobility problems with ADLs limitations, (5) combinations of the latter three and (6) death. RESULTS: Approximately 43% of the sample remained in the same level of disability after 2 years. The patterns of progression with two disabilities differ for men and women. CONCLUSIONS: Our model reflects the importance of separating ADLs and IADLs in the study of disability progression in Mexico. Varying risk profiles and cultural differences might influence the divergent disability paths followed by each gender. Implications for Rehabilitation The disablement process involving transitions from mobility impairments to IADL and ADL limitations seen in developed countries differs for older adults in Mexico. Cultural differences may influence the progression from non-disabled to becoming disabled in different ways for females in developing countries like Mexico. One-fifth of individuals showed greater function and independence over time, suggesting that the disablement process is reversible. This finding highlights the need to focus on improving mobility, ADL, and IADL skills to facilitate successful aging. Although disability is often conceptualised as a combination of ADL and IADL limitations, gender differences seen in Mexico indicate the need to separate ADL and IADL when developing approaches to prevent or ameliorate disability.

Transitions in activities of daily living in Mexico, 2001-2012 / Transiciones en actividades de la vida diaria en México, 2001 -2012

Objective. This paper describes the 2001-2012 progression of limitations in daily activities in the Mexican elderly population aged 60 or older and identifies how sociodemographic and health factors affect these progressions. Materials and methods. Data come from the Mexican Health and Aging Study (MHAS), a national sample of adults born in 1951 or earlier, including a baseline survey in 2001 and follow-ups in 2003 and 2012. Results. Difficulty in getting dressed is the activity that has the highest prevalence in all three waves for both genders. In the 11-year transition, 42.8% of the respondents with no limitations in 2001 reported no limitations in 2012. In contrast, 60.8% of those who reported three or more limitations in 2001 had died by 2012. Conclusions. With the rapid aging of the Mexican population, the knowledge of patterns of deterioration of functional limitations will prove useful for future public health policies.

Objetivo. Describir la progresión de las limitaciones en actividades de la vida diaria en la población mexicana de 60 años o más e identificar cómo diversos factores sociodemográficos y de salud afectan estas progresiones. Material y métodos. Los datos provienen del Estudio Nacional de Salud y Envejecimiento en México (Enasem), un panel representativo a nivel nacional de adultos nacidos en 1951 o antes, que incluye una encuesta inicial en 2001 y seguimientos en 2003 y 2012. Resultados. Las dificultades para vestirse constituyeron la actividad con mayor prevalencia en las tres rondas del Enasem para ambos sexos. En la transición de 11 años, 42.8% de los entrevistados sin limitantes en 2001 se mantuvo igual en 2012. En contraste, 60.8% de los entrevistados que reportaron tres o más limitantes en 2001 murió antes de 2012. Conclusiones. El conocimiento de los patrones de deterioro en limitaciones funcionales será de gran utilidad para políticas públicas en salud, ante el rápido envejecimiento de la población mexicana.

Shorter stay, longer life: age at migration and mortality among the older Mexican-origin population.

OBJECTIVE: In this article, we investigate the association between age at migration and mortality during a 13-year period in a sample of Mexican American immigrants 65 and older at baseline. METHOD: We employ the Hispanic Established Populations for Epidemiologic Studies of the Elderly (H-PESE) to control for mortality-related health and social factors. RESULTS: Our analyses show that the immigrant generation does not represent a homogeneous mortality risk category. Individuals who migrated to the United States in mature adulthood have a considerably lower risk of death than individuals who migrated in childhood or midlife. Chronic conditions or functional capacity do not account for these differences. CONCLUSION: Our findings suggest that standard risk pools may differ significantly on the basis of genetic and unmeasured life-course factors. A better understanding of the late-life immigrant mortality advantage has important implications for more effective and targeted social and medical interventions.