ABSTRACT
The size and growth patterns of nestling birds are key determinants of their survival up to fledging and long-term fitness. However, because traits such as feathers, skeleton and body mass can follow different developmental trajectories, our understanding of the impact of adverse weather on development requires insights into trait-specific sensitive developmental windows. We analysed data from nestling Alpine swifts in Switzerland measured throughout growth up to the age of 50 days (i.e. fledging between 50 and 70 days), for wing length and body mass (2693 nestlings in 25 years) and sternum length (2447 nestlings in 22 years). We show that the sensitive developmental windows for wing and sternum length corresponded to the periods of trait-specific peak growth, which span almost the whole developmental period for wings and the first half for the sternum. Adverse weather conditions during these periods slowed down growth and reduced size. Although nestling body mass at 50 days showed the greatest inter-individual variation, this was explained by weather in the two days before measurement rather than during peak growth. Interestingly, the relationship between temperature and body mass was not linear, and the initial sharp increase in body mass associated with the increase in temperature was followed by a moderate drop on hot days, likely linked to heat stress. Nestlings experiencing adverse weather conditions during wing growth had lower survival rates up to fledging and fledged at later ages, presumably to compensate for slower wing growth. Overall, our results suggest that measures of feather growth and, to some extent, skeletal growth best capture the consequences of adverse weather conditions throughout the whole development of offspring, while body mass better reflects the short, instantaneous effects of weather conditions on their body reserves (i.e. energy depletion vs. storage in unfavourable vs. favourable conditions).
ABSTRACT
Juvenile survival is a key life-history influence on population dynamics and adaptive evolution. We analyzed the effects of individual characteristics, early environment, and maternal investment on juvenile survival in a large solitary hibernating rodent-yellow ground squirrel Spermophilus fulvus using Cox mixed-effects models. Only 48% of weaned pups survived to dispersal and 17% survived to hibernation. Early life expectancy was primarily determined by individual characteristics and, to a lesser extent, by the early environment. The strongest and positive predictor of juvenile survival was body mass which crucially affected mortality immediately after weaning. Males suffered higher mortality than females after the onset of dispersal; however, the overall difference between sexes was partly masked by high rates of mortality in the first days after emergence in both sexes. Later emerged juveniles had lower life expectancy than the earliest pups. The overall effect of local juvenile density was positive. Prolonged lactation did not enhance juvenile survival: Pups nursed longer survived shorter than the young nursed for a shorter period. Our findings support the hypothesis that females of S. fulvus cannot effectively regulate maternal expenditures to mitigate the effects of unfavorable conditions on their offspring. The strategy to deal with seasonal time constraints on life history in female S. fulvus suggests an early termination of maternal care at the cost of juvenile quality and survival. This female reproductive strategy corresponds to a "fast-solitary" life of folivorous desert-dwelling S. fulvus and other solitary ground squirrels with prolonged hibernation.
ABSTRACT
We study the effect of economic conditions early in life on the occurrence of type-2 diabetes in adulthood using contextual economic indicators and within-sibling pair variation. We use data from Lifelines: a longitudinal cohort study and biobank including 51,270 siblings born in the Netherlands from 1950 onward. Sibling fixed-effects account for selective fertility. To identify type-2 diabetes we use biomarkers on the hemoglobin A1c concentration and fasting glucose in the blood. We find that adverse economic conditions around birth increase the probability of type-2 diabetes later in life both in males and in females. Inference based on self-reported diabetes leads to biased results, incorrectly suggesting the absence of an effect. The same applies to inference that does not account for selective fertility.
Subject(s)
Biomarkers , Blood Glucose , Diabetes Mellitus, Type 2 , Glycated Hemoglobin , Siblings , Humans , Male , Female , Longitudinal Studies , Biomarkers/blood , Netherlands , Glycated Hemoglobin/analysis , Blood Glucose/analysis , Adult , Middle Aged , Socioeconomic FactorsABSTRACT
Background: Brief therapies have proven to reduce tobacco cost-effectively, however, unsuccessful quit attempts remain notable in real-life conditions, and the underlying mechanisms of treatment success are still unclear. Objectives: We aimed to analyze the effectiveness of the Guided Self-Change (GSC) therapy combined with varenicline (VAR+T) in public health services against varenicline alone (VAR), and to identify mediators of treatment outcomes. We conducted a two-arm quasi-experimental study with 126 treatment-seeking smokers (age=57.3±9.1 years; 59.5% women). Before treatment, and at weeks 12 and 24, we assessed tobacco use and five potential mediators: withdrawal, craving, motivation to quit, anxiety, and depression. Results: Only 25% of participants adhered to varenicline prescription, and 54% to GSC therapy. VAR+T group showed a greater proportion of abstainers compared to VAR group at week 12 (75% vs 57.4%; φc=0.21) and week 24 (62.9% vs 52.5%; φc=0.10). When controlling for weeks taking varenicline, motivation showed a significant indirect effect over abstinence rates in VAR+T compared with VAR (a1b1=1.34; 95%CI=0.04, 5.03). Conclusions: The GSC effectiveness seems to increase motivation which in turn contributes to reducing tobacco use. The implementation of GSC therapy in public health services could minimize treatment duration and increase smoking abstinence in 'real-life' conditions where varenicline adherence remains low.
Subject(s)
Smoking Cessation , Female , Humans , Middle Aged , Aged , Male , Varenicline/therapeutic use , Smoking , Treatment Outcome , Tobacco Use Cessation DevicesABSTRACT
Introducción: La mortalidad infantil se ve afectada por condiciones de vida socioeconómicas y ambientales deletéreas, las cuales se agravan en situaciones excepcionales. Objetivo: Describir la mortalidad infantil en el municipio habanero de La Lisa durante un trienio, según la estratificación diferencial de las condiciones de vida del territorio. Métodos: Se llevó a cabo un estudio observacional, descriptivo y transversal (de tipo ecológico exploratorio) en el municipio capitalino de La Lisa en el trienio 1991-1993, donde las unidades de análisis fueron las áreas de salud estratificadas mediante clasificación automática. Las variables fundamentales fueron las condiciones de vida, según diferentes dimensiones y sus variables, y las tasas centrales de mortalidad infantil en el periodo, considerando sus componentes y la causa básica de muerte. Resultados: Se logró estratificar el municipio según sus condiciones de vida en asentamientos favorables y desfavorables. La mortalidad infantil fue superior en el asentamiento con condiciones de vida desfavorables (10,3 fallecidos por 1000 nacidos vivos), donde predominaron como causas de muerte el traumatismo obstétrico, la muerte idiopática y la sepsis. Conclusiones: Se alcanzó la estratificación según condiciones de vida en el municipio de La Lisa. El asentamiento poblacional con condiciones de vida desfavorables evidenció riesgo de mortalidad infantil diferencial sustantivo, probablemente asociado a factores higiénico-sanitarios y socioeconómicos deletéreos, según las causas de muerte registradas.
Introduction: Infant mortality is affected by deleterious, socioeconomic and environmental living conditions, which are aggravated in exceptional situations. Objective: To describe infant mortality in the Havana municipality of La Lisa during the three-year period 1991-1993, according to the differential stratification of living conditions in the territory. Methods: An observational, descriptive and transversal study (of exploratory ecological type) was carried out in the capital municipality of La Lisa, in the triennium 1991-1993, where the units of analysis were the health areas stratified by automatic classification. The fundamental variables were living conditions, according to different dimensions and their variables, and the central infant mortality rates in the period, considering its components and the basic cause of death. Results: The municipality was stratified according to its living conditions in favorable and unfavorable settlements. Infant mortality was higher in the settlement with unfavorable living conditions (10.3 deaths per 1000 live births), where obstetric trauma, idiopathic death and sepsis predominated as causes of death. Conclusions: Stratification according to living conditions in the municipality of La Lisa was achieved. The population settlement with unfavorable living conditions showed a substantial differential infant mortality risk, probably associated with hygienic-sanitary and socioeconomic factors, according to the causes of death recorded.
Subject(s)
Social Conditions , Infant Mortality , Social StatusABSTRACT
While the effects of joblessness on the health of the non-employed are well-documented, its long-term spillover consequences on the health of their relatives, especially children, remain poorly understood. This research explores the long-term associations of parental nonemployment spells experienced during early, mid and late childhood on children's mental and physical health. The analysis exploits data drawn from the British Household Panel Survey (BHPS) and the UK Household Longitudinal Study (UKHLS), linking detailed parental socioeconomic information with their children between the years 1993 and 2013. This paper employs a Correlated Random Effects (CRE) probit model that allows accounting for unobserved heterogeneity as well as a non-linear Generalized Estimating Equations (GEE) random effects estimator accounting in addition for the dependency structure of the data. Results indicate that experiencing parental nonemployment during early and late childhood has a negative association on the children's likelihood of suffering from long-standing illnesses later in life, while experiencing parental nonemployment during middle childhood negatively affects the young adult's mental health. Moreover, experiencing parental nonemployment during late childhood increases the probability of both reporting poor or fair self-assessed health and the likelihood of consuming prescribed medicines in early adulthood. However, there seems to be a considerable effect heterogeneity by family socioeconomic status, parents' gender, and frequencies of parental nonemployment spells. Current adulthood circumstances, such as level of educational attainment, job situation and household demographics, are used to explore the potential mechanisms affecting results. These findings may help policymakers shape appropriate responses to mitigate the psychological and physical burden derived from parental nonemployment, especially among already disadvantaged households.
Subject(s)
Child Health , Social Class , Young Adult , Humans , Child , Adult , Longitudinal Studies , Mental Health , Educational StatusABSTRACT
Old age represents a social group that is undergoing continuous expansion. The aging population will be prone to chronic diseases and falls, which is a marker of frailty and a public health problem. This study aims to examine the relationship between living conditions and the prevalence of the risk of falls in older adults within the community. As an observational cross-sectional study, intentional sampling was carried out on residents of the metropolitan area over 75 years of age. The socio-demographic data of the subjects and their history of falls were collected. Additionally, the subjects were evaluated on the risk of falling, basic activities of daily living, such as walking and balance, fragility, and their fear of falling. The statistical analyses used were based on the Shapiro-Wilk test for normality, statistics of central tendency with description, mean (M) and dispersion, standard deviation (SD), bivariate contingency tables for studying the relationships between the variables, and the analysis of Pearson's relational statistics (χ2). The comparisons of means were resolved by parametric or non-parametric routes. We obtained the following results: 1. The socio-demographic profile of our sample consisted of adults over 75 years of age, the majority of whom were overweight or obese women living in an urban area, specifically in an apartment, and receiving care; 2. Older people in the studied community had mild dependency and frailty, and were also at severe risk of falls; 3. The prevalence of falls was higher in women than in men in this study. Through these results, we confirmed the relationship between living conditions and the prevalence of risk of falls in older adults within the community.
Subject(s)
Frailty , Independent Living , Male , Humans , Female , Aged , Activities of Daily Living , Frailty/epidemiology , Social Conditions , Incidence , Cross-Sectional Studies , FearABSTRACT
We investigate how experiencing parental death in infancy, childhood, or adolescence affected individuals' health using two distinct measures: mortality before age 20 and young adult height. Using two complementary indicators of health enables us to gain more insights into processes of selection and the scarring of health. Employing nationally representative data for the Netherlands for the 1850-1940 period, we analyze the survival of roughly 36,000 boys and girls using Cox proportional hazard models, and the stature of more than 4,000 young adult men using linear regression models. Results show that losing a parent-particularly a mother-at an early age (0-1 or 1-5) was related to a strongly increased risk of mortality. We find no evidence that losing a parent at these ages affected stature in young adulthood. For boys, experiencing maternal death between ages five and 12 was strongly associated with a shorter young adult height; however, we did not find evidence for an association between experiencing paternal death and shorter stature. We conclude that stature may not be a particularly good measure of the effects of early-life adversity if the health shock greatly increases mortality, as these effects create potential issues of health selection.
Subject(s)
Maternal Death , Parental Death , Male , Female , Adolescent , Young Adult , Humans , Adult , Child , Netherlands/epidemiology , Mothers , Parents , Body HeightABSTRACT
This paper estimates the effect of in utero exposure to adverse events on late life diabetes, cardiovascular disease risks and cognition deficiency. We merge data on the regional violence during the Cultural Revolution and the excessive death rates during the Chinese Great Famine with data from the China Health and Retirement Longitudinal Study survey. Results show that female babies who were exposed in utero to the famine have higher diabetes risks, while male babies who were exposed to the Cultural Revolution are shown to have lower cognitive abilities.
Subject(s)
Prenatal Exposure Delayed Effects , Humans , Male , Female , Longitudinal Studies , Prenatal Exposure Delayed Effects/epidemiology , Famine , China/epidemiology , RetirementABSTRACT
This paper explores the evolution of inequality of opportunity in the prevalence of chronic diseases along the life cycle and across different birth cohorts for individuals aged 50 or older and residing in 13 European countries. We adopt an ex-ante parametric approach and rely on the dissimilarity index as our reference inequality metric. In addition to a commonly used set of circumstances, we pay particular attention to the role of adverse early-life conditions, such as the experience of harm and the quality of the relationship with parents. In order to quantify the relative importance of each circumstance, we apply the Shapley inequality decomposition method. Our results suggest that inequality of opportunity in health is not stable over the life cycle - it is generally lower at younger ages and then monotonically increases. Moreover, it varies between different birth cohorts and is generally higher for younger individuals than for older age groups. Finally, the contribution of adverse early life conditions ranges between 25% and 45%, which is comparable to the share of socio-economic circumstances but significantly higher than the relative contribution of other demographic characteristics, especially at younger ages.
ABSTRACT
Parental stress often has long-term consequences for offspring. However, the mechanisms underlying these effects and how they are shaped by conditions offspring subsequently experience are poorly understood. Telomeres, which often shorten in response to stress and predict longevity, may contribute to, and/or reflect these cross-generational effects. Traditionally, parental stress is expected to have negative effects on offspring telomeres, but experimental studies in captive animals suggest that these effects may depend on the subsequent conditions that offspring experience. Yet, the degree to which parental stress influences and interacts with stress experienced by offspring to affect offspring telomeres and survival in free-living organisms is unknown. To assess this, we experimentally manipulated the stress exposure of free-living parent and offspring house sparrows (Passer domesticus). We found a weak, initial, negative effect of parental stress on offspring telomeres, but this effect was no longer evident at the end of post-natal development. Instead, the effects of parental stress depended on the natural sources of stress that offspring experienced during post-natal development whereby some outcomes were improved under more stressful rearing conditions. Thus, the effects of parental stress on offspring telomeres and survival are context-dependent and may involve compensatory mechanisms of potential benefit under some circumstances.
Subject(s)
Sparrows , Animals , Longevity , Sparrows/physiology , TelomereABSTRACT
AbstractBecause parental care has a heritable basis, the benefits of receiving increased parental provisioning early in life are genetically linked to the costs of providing increased parental provisioning at adulthood. Reproductive strategies thus result in distinct cost-benefit syndromes across the life course that may shape individual health and aging trajectories. Here we used an artificial selection approach in Japanese quail (Coturnix japonica) to test how reproductive strategies affect telomere length, a biomarker of somatic state, at different life stages. We show that males but not females from lines selected for low maternal investment (i.e., developing in a relatively small egg) had shorter telomeres at birth. These patterns were still weakly present at the end of the juvenile growth period. In contrast, significantly shorter telomeres were found in reproductively active adult birds from the high-investment lines, suggesting that telomere attrition was accelerated in these individuals once they had become reproductively active. Our study shows that reproductive strategies differentially affect telomere dynamics across the life course, highlighting the role of cross-generational constraints in shaping individual aging trajectories.
Subject(s)
Coturnix , Life Change Events , Adult , Aging/genetics , Animals , Coturnix/genetics , Humans , Infant, Newborn , Male , Reproduction , TelomereABSTRACT
OBJECTIVES: To assess mental health and life conditions in adolescents with autoimmune rheumatic diseases (ARDs) and healthy controls quarantined during COVID-19 pandemic. METHOD: A cross-sectional study included 155 ARD adolescents and 105 healthy controls. Online survey included self-reported strengths and difficulties questionnaire (SDQ), and a semi-structured questionnaire with demographic data, daily home and school routine, physical activities, and COVID-19 information during the pandemic. RESULTS: Among patients, 56% had juvenile idiopathic arthritis (JIA), 29% juvenile systemic lupus erythematosus (JSLE), and 15% juvenile dermatomyositis (JDM). No differences were found regarding sex, ethnicity, and current age between ARD patients and controls (p > 0.05). Abnormal emotional SDQ (38% vs. 35%, p = 0.653) were similar in both groups. Logistic regression analyses in ARD patients demonstrated that female (OR = 2.4; 95%CI 1.0-6.0; p = 0.044) was associated with severe emotional SDQ dysfunction, whereas sleep problems were considered as a risk factor for both worse total SDQ (OR = 2.6; 95%CI 1.2-5.5; p = 0.009) and emotional SDQ scores (OR = 4.6; 95%CI 2.2-9.7; p < 0.001). Comparisons between ARD patients with and without current prednisone use showed higher median scores of peer problems in the first group [3 (0-10) vs. 2 (0-7), p = 0.049], whereas similar median and frequencies between JIA, JSLE, and JDM (p > 0.05). CONCLUSIONS: Approximately one third of JIA, JSLE, and JDM patients presented abnormal total and emotional scores of SDQ during COVID-19 quarantine. Sleep problems were the main factor associated with emotional difficulties in these ARD adolescents. The knowledge of mental health issues rates in adolescents with ARD supports the development of prevention strategies, like sleep hygiene counseling, as well as the references of the affected patients to specialized mental health services, as necessary. Key Points ⢠One third of ARD patients presented mental health issues during COVID-19 quarantine ⢠Sleep problems were associated with emotional difficulties. ⢠It is necessary to warn pediatric rheumatologists about the importance of sleep hygiene counseling.
Subject(s)
Arthritis, Juvenile , COVID-19 , Dermatomyositis , Lupus Erythematosus, Systemic , Sleep Wake Disorders , Adolescent , Arthritis, Juvenile/complications , Child , Cross-Sectional Studies , Dermatomyositis/complications , Female , Humans , Lupus Erythematosus, Systemic/complications , Mental Health , Pandemics , Prednisone , QuarantineABSTRACT
OBJECTIVES: Childhood socioeconomic disadvantage is consistently associated with lower cognitive function in later life. This study aims to distinguish the contribution of specific aspects of childhood socioeconomic disadvantage for memory performance in mid to late adulthood, with consideration for direct and indirect effects through education and occupation. METHODS: Data were from adults aged 50 to 80 years who completed the life history module in the 2006/2007 wave of the English Longitudinal Study of Aging (n = 4,553). The outcome, memory score, was based on word recall tests (range: 0-20 points). We used the g-formula to estimate direct and indirect effects of a composite variable for childhood socioeconomic disadvantage and its 4 individual components: lower-skilled occupation of the primary breadwinner, having few books in the home, overcrowding in the home, and lack of water and heating facilities in the home. RESULTS: Few books were the most consequential component of childhood socioeconomic disadvantage for later-life memory (total effect: -0.82 points for few books; 95% confidence interval [CI]: -1.04, -0.60), with roughly half being a direct effect. The total effect of a breadwinner in lower-skilled occupations was smaller but not significantly different from a few books (-0.67 points; 95% CI: -0.88, -0.46), while it was significantly smaller with overcrowding (-0.31 points; 95% CI: -0.56, -0.06). The latter 2 total effects were mostly mediated by education and occupation. DISCUSSION: A literate environment in the childhood home may have lasting direct effects on memory function in mid to later life, while parental occupation and overcrowding appear to influence memory primarily through educational and occupational pathways.
Subject(s)
Aging , Cognition , Adult , Aging/psychology , Educational Status , Humans , Longitudinal Studies , Occupations , Social Class , Socioeconomic FactorsABSTRACT
Morbidity and mortality are on the rise among Baby Boomers and younger cohorts. This study investigates whether this unfavorable health trend across birth cohorts 1925-1999 is related to rising income inequality Americans face during childhood. We use two nationally representative datasets: National Health and Nutrition Examination Surveys (NHANES) 1988-2018 and Panel Studies of Income Dynamics (PSID) 1968-2013, and two health outcomes: biomarkers of physiological dysregulation, and a chronic disease index. Childhood income inequality is measured by the average of the Gini index at the national level each birth cohort is exposed to between birth and age 18, where the Gini index from 1925 to 2016 is computed based on Internal Revenue Service income data. By merging childhood income inequality to individual level data from NHANES or PSID based on birth cohort, we find childhood income inequality is positively associated with the risk of physiological dysregulation in adulthood for all gender and racial groups in the NHANES data. It is also significantly related to the risk of chronic disease in the PSID data. This association is robust to controls for individual level childhood health and family background, adulthood socioeconomic and marital status, and contemporary macro socioeconomic factors. More importantly, childhood income inequality exposure explains a substantial amount of variation in these two health outcomes across cohorts, a pattern not observed for other early life exposures that display negative temporal trends similar to those for childhood income inequality. This study provides important evidence that income inequality experienced during childhood may have a long-lasting negative consequence for adult health, which partially explains the adverse health trends experienced by Baby Boomers and younger cohorts in the United States.
Subject(s)
Health Status , Income , Adolescent , Adult , Educational Status , Health Status Disparities , Humans , Nutrition Surveys , Socioeconomic Factors , United States/epidemiologyABSTRACT
This study investigated the psychological impact of the coronavirus disease 2019 (COVID-19) among youth by analyzing their emotional/behavioral problems before and during the long-lasting lockdown in Spain. For that purpose, 699 parents with children aged 6-17 and 552 adolescents aged 12-17, who completed the parent and adolescent version of the Strengths and Difficulties Questionnaire at the beginning of 2019, responded to a survey from 26 May to 15 June 2020 that assessed psychological well-being and life conditions during quarantine (i.e., sociodemographic characteristics, situation before the lockdown, physical environment and accompaniment during the lockdown, COVID-related variables). According to both parent- and self-reports, children and youth experienced a significant worsening in emotional symptoms, conduct problems, hyperactivity/inattention, peer problems, and total difficulties subscales. Findings also suggested that impairment was mainly associated with variables related to the child's situation prior to home quarantine, the quality and quantity of the child's social networks during the lockdown, the daily routines the child followed, the concerns the child had about health, and the presence of economic and learning problems caused by the COVID-19. Thus, the present investigation emphasizes the need for carefully monitoring the mental health of younger people, provides guidance for the development of interventions that mitigate some of the psychological difficulties faced in a situation of confinement, and highlights the importance of paying special attention to high-risk groups.
Subject(s)
COVID-19 , Adolescent , COVID-19/epidemiology , Child , Communicable Disease Control , Humans , Mental Health , Quarantine , SARS-CoV-2ABSTRACT
PURPOSE: To assess the efficacy of a supervised in-school combined resistance and aerobic training program in adolescent girls and investigate whether responses differ according to birthweight. METHODS: Participants (girls aged 13-17 y) were randomized either to an intervention replacing physical education (PE) classes with 2 × 60-minute training sessions per week (n = 58) or to a control group that continued to attend 2 × 60 minutes per week of curriculum PE (n = 41). We measured muscular fitness (handgrip, standing long jump, and sit-ups), cardiorespiratory fitness (20-m shuttle run), skinfolds, and lean body mass preintervention and postintervention and determined effect size (Hedge's g) differences between changes in these measures. We also compared changes within lower (<3000 g) and normal birthweight intervention and PE control subgroups. RESULTS: The intervention group showed greater improvements in all the fitness measures and lean body mass (g = 0.22-0.48) and lower skinfold increases (g = 0.41) than PE controls. Within the intervention group, improvements in all fitness measures were larger in lower birthweight (g = 0.53-0.94) than in normal birthweight girls (g = 0.02-0.39). CONCLUSION: Replacing curriculum PE with supervised training improved muscular and cardiorespiratory fitness and body composition outcomes in adolescent females. Our findings suggest an enhanced adaptive response to training in participants with lower birthweight which warrants further investigation.
Subject(s)
Cardiorespiratory Fitness , Resistance Training , Adolescent , Birth Weight , Female , Hand Strength , Humans , Physical Fitness/physiology , SchoolsABSTRACT
Early-life conditions are associated with mortality in men, but not studied to the same extent in women. We add new evidence by studying a cohort of women born between 1916 and 1931 and followed for mortality between 1986 and 2013. Our sample from Iowa includes a significant number of rural women, from both farms and small towns. The long-term effects of growing up in a rural area were mixed: farmers' daughters lived longer than women growing up off-farm in rural areas. Daughters of farm laborers and skilled or semi-skilled trades workers fared worst, when considering early-life socioeconomic status. We also find evidence that migrating to small-town Iowa was associated with lower life expectancy after age fifty-five. Considering social class and farm-nonfarm status is important for understanding the health of rural America.
ABSTRACT
Objectives: The recent biological clocks GrimAge and PoAm are robust predictors of morbidity and mortality. Little research, however, has investigated the factors that influence their ticking speed. No study has used multivariate analyses to examine whether childhood adversity, adult hardship, lifestyle practices, or some combination of these factors best explains acceleration of these indices. Methods: Using a sample of 506 middle-age African Americans, the present study investigated the extent to which childhood instability, adult adversity, and lifestyle predict accelerated GrimAge and PoAm. Results: The two clocks were highly correlated and the pattern of findings was very similar for the two measures. Childhood instability, adult financial hardship, and smoking were significant predictors of both clocks. Discussion: The findings support a life course perspective where both the long arm of childhood as well as later life conditions influence speed of aging. Similar results across the two clocks enhance confidence in the findings.
Subject(s)
Aging , Black or African American , Humans , Life Style , Smoking/epidemiologyABSTRACT
OBJECTIVES: To investigate whether childhood socioeconomic status (SES) is associated with cognitive function, and what factors might mediate the associations. METHOD: Using data from the China Health and Retirement Longitudinal Study (CHARLS) and within frameworks of the latency model, the pathway model and the accumulation model, we quantified direct and indirect pathways between childhood SES and cognitive function for Chinese middle-aged and older adults aged 45+ by structural equations modeling. RESULTS: We found significant direct, indirect and total effects of childhood SES on cognitive function at baseline. The indirect effects were mediated through educational attainment, household consumption, smoking behaviors and social engagement. At follow-ups, cognitive enhancement can be made by indirect pathways through educational attainment, improvement of household consumption and social engagement. CONCLUSION: Our results supported the latency model, the pathway model and the accumulation model when considering pathways linking childhood SES to cognitive function. The findings underscored the value of taking early interventions to improve SES and cognitive function, especially among those with low childhood SES.