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The purpose of this study is to investigate the association between social mobility and cognitive impairment among older adults in Korea. The study sample is drawn from nationally representative data, which comes from the 2016 Korean Longitudinal Study of Ageing (KLoSA). The final sample consists of 4264 KLoSA respondents aged 65 or older. Gender-specific logistic regression models are used to examine the association between social mobility and cognitive impairment. The results show that, when compared to the reference group (stable low social mobility), women in the downward and the stable high social mobility groups were less likely to have cognitive impairment. In contrast, upward social mobility was a protective factor for cognitive impairment only among men. Gender-specific interventions may be needed to enhance cognitive health among older Koreans. Further research is needed to examine the causal relations between social mobility and cognitive health between the genders. [ABSTRACT FROM AUTHOR]

Abstract Background Due to the rapid growth of the older adult population, multimorbidity has become a global concern for an aging society. Multimorbidity has been associated with poor health outcomes, including low quality of life and a high risk of mortality, resulting in an overload of healthcare systems. However, multimorbidity incidence and its related factors are poorly understood among older adults. This study aimed to determine whether sociodemographic characteristics, lifestyle, and psychosocial factors predict multimorbidity incidence among older adults in Korea. Methods This longitudinal study used the Korean Longitudinal Study of Aging (KLoSA) dataset from 2008 to 2018. The KLoSA is a panel survey of nationally representative samples aimed at providing data for developing socioeconomic policies for the increasing aging population in Korea. The study sample included 1967 older adults aged 65 years and over who had none or one of the chronic diseases at the baseline in 2008. Multimorbidity incidence was defined as the co-existence of two or more chronic diseases among 12 doctor-diagnosed diseases based on self-reports. Cox’s proportional hazards models were used to identify significant predictors of multimorbidity incidence over a 10-year follow-up period. Results Among 1967 respondents (female 54.5%, mean age 72.94), 625 (31.8%) incidents of multimorbidity were reported, contributing to 47.5 incidents per 1000 people after 10 years of follow-up. Low levels of social interaction, obesity, past smoking habits, and current or past drinking habits were identified as significant predictors of multimorbidity incidence among older adults in Korea. Conclusions This study identified older adults at high risk for multimorbidity incidence. These groups require more attention from health care providers in the course of chronic disease monitoring and management. Specific interventions and health policies to promote social interaction and a healthy lifestyle are essential to delay multimorbidity incidence. This longitudinal approach will contribute to developing preventive strategies to reduce the incidence of multimorbidity among older adults.

ObjectivesGeriatric oral health-related quality of life is a relatively new but rapidly growing concept as it is directly related to the general wellbeing and self-esteem of older adults. This study assessed the impact of worsening depression symptoms on oral health-related quality of life using representative nationwide data of Korean older adults.MethodsThis study comprised a longitudinal sample of older adults aged ≥60 from the Korean Longitudinal Study of Aging (2016–2020). After applying the exclusion criteria, 3,286 participants were included in the study. Depression status was determined through the biennial assessment of the short-form Center for Epidemiologic Studies Depression Scale (CESD-10); oral health was measured using the Geriatric Oral Health Assessment Index (GOHAI). We employed the lagged general estimating equations to assess the temporal effect of the CESD-10 score change on the GOHAI score.ResultsA decrease in CESD-10 score over a 2-year period was significantly associated with a decrease in GOHAI score in men and women: β = −1.810 and β = −1.278, respectively (p-values < 0.0001). Furthermore, compared to the same or improved CESD-10 score, worsening of the score on 1–2 points detected the β = −1.793 in men and β = −1.356 in women, and worsening on ≥3 points: β = −3.614 in men and β = −2.533 in women.ConclusionsThis study found that depression exacerbation is negatively associated with oral health-related quality of life in later life. Further, a more significant worsening of depression symptoms was correlated with lower scores for oral health-related quality of life in our study population.

Abstract Background The importance of SA (Successful aging) has been emphasized in recent years, with focus shifting towards attaining healthier aging rather than longevity. However, the influence of SA and its changes on mental health such as depression remains a relatively unexplored area in gerontology. Therefore, we investigated the longitudinal association between changes in SA and depressive symptoms in Korean older adults. Methods This study comprised a longitudinal sample of older adults aged ≥ 45 years, drawn from the Korean Longitudinal Study of Aging (2006–2018). Changes in SA status was determined using the Rowe and Kahn model over two consecutive years. Using an adjusted generalized estimating equation model, we examined the association between changes in successful aging status, namely SA and NSA (Non-successful aging), and depressive symptoms. Results Compared to the SA→SA group, depressive symptom risk in the NSA→NSA and SA→NSA groups were higher in men [(OR, 1.16; 95 % CI, 1.13–1.18), (OR, 1.11; 95 % CI, 1.08–1.13), respectively] and in women [(OR, 1.15; 95 % CI, 1.13–1.18), (OR, 1.11; 95 % CI, 1.09–1.14), respectively]. Subgroup analysis of the dimensions of successful aging revealed that low or worsening criteria of successful aging status in men and women were associated with depressive symptoms. Conclusions Korean older adults who continuously failed to attain or maintain successful aging status had the highest risk of depressive symptoms. These results could further assist in establishing policies and interventions that promote successful aging and subsequently protect the mental health of the Korean older adult population.

Background: Due to the rapid growth of the older adult population, multimorbidity has become a global concern for an aging society. Multimorbidity has been associated with poor health outcomes, including low quality of life and a high risk of mortality, resulting in an overload of healthcare systems. However, multimorbidity incidence and its related factors are poorly understood among older adults. This study aimed to determine whether sociodemographic characteristics, lifestyle, and psychosocial factors predict multimorbidity incidence among older adults in Korea. Methods: This longitudinal study used the Korean Longitudinal Study of Aging (KLoSA) dataset from 2008 to 2018. The KLoSA is a panel survey of nationally representative samples aimed at providing data for developing socioeconomic policies for the increasing aging population in Korea. The study sample included 1967 older adults aged 65 years and over who had none or one of the chronic diseases at the baseline in 2008. Multimorbidity incidence was defined as the co-existence of two or more chronic diseases among 12 doctor-diagnosed diseases based on self-reports. Cox's proportional hazards models were used to identify significant predictors of multimorbidity incidence over a 10-year follow-up period. Results: Among 1967 respondents (female 54.5%, mean age 72.94), 625 (31.8%) incidents of multimorbidity were reported, contributing to 47.5 incidents per 1000 people after 10 years of follow-up. Low levels of social interaction, obesity, past smoking habits, and current or past drinking habits were identified as significant predictors of multimorbidity incidence among older adults in Korea. Conclusions: This study identified older adults at high risk for multimorbidity incidence. These groups require more attention from health care providers in the course of chronic disease monitoring and management. Specific interventions and health policies to promote social interaction and a healthy lifestyle are essential to delay multimorbidity incidence. This longitudinal approach will contribute to developing preventive strategies to reduce the incidence of multimorbidity among older adults. [ABSTRACT FROM AUTHOR]

Background: In most of developed societies, the prevalence of informal care is on the rise due to rapid population ageing. This study investigates longitudinal associations between informal caregiving and health among caregivers and potential gender differences in this relationship. Moreover, drawing on the Health Promotion Model, this study examines the mediating role of health promoting behaviors in the link between informal caregiving and caregiver's health. Methods: Seven waves of a large-scale (N = 9,608), a nationally representative longitudinal study of middle- and old-aged adults in Korea between 2006 and 2018, were used. To address the possibility of omitted variable bias, this study employed ordinary least squares models with lagged dependent variables (OLS-LDV) as well as fixed effects (FE) models. Univariate Sobel-Goodman mediation tests were used. Results: Findings from OLS-LDV models showed that transition into informal caregiving is negatively associated with health satisfaction and self-rated health. FE results also suggest that our results are robust to controlling for unobserved heterogeneity. In the model where informal caregiving is interacted with gender, we found that these associations were largely driven by women caregivers. Results from Sobel-Goodman tests revealed that a decrease in regular exercise partially explains the observed association between informal caregiving and subjective health outcomes (11% for health satisfaction and 8% for self-rated health). Conclusions: Although informal caregiving can be a rewarding role, it poses a threat to caregiver's subjective health. Findings of this hold important implications and provide evidence in support of a gender-conscious approach to improve the health and well-being of informal caregivers. [ABSTRACT FROM AUTHOR]

Objectives: Geriatric depression complicates cognitive health in older adults. This study aims to investigate the impact of depressive symptoms on cognitive impairment in community-dwelling older adults, depending on whether cognitive dysfunction accompanied.Design: A community-based longitudinal cohort study.Setting: This study analyzed data from the Korean Longitudinal Study of Aging (KLoSA) from 2006 to 2018.Participants: Among 10,254 individuals who were registered in the KLoSA study, a total of 9119 subjects met the criteria, and 4547 subjects were included in the final analysis. The subjects were grouped into 4 categories based on depressive symptoms and cognitive dysfunction at baseline assessment: "normal control" (NC, n = 3341), "depression only" (Dep-only, n = 652), "cognitive dysfunction only" (CD-only, n = 393), and "depression with cognitive dysfunction" (Dep-CD, n = 161).Measurements: Cognitive impairment 10 years later was defined as K-MMSE scores below two percentile on demographically adjusted norms.Results: Ten-year survival, that is, not experiencing cognitive impairment, was 80 $$ \pm \,$$1% in NC group, 72 $$ \pm $$ 2% in Dep-only group, 52 $$ \pm $$ 3% in CD-only group, and 44 $$ \pm $$ 5% in Dep-CD group. The hazard ratio (HR) of the Dep-only group (HR = 1.18, 95% CI, 0.97-1.43, n.s.) did not differ from that of the NC group, but the HR of the Dep-CD group was significantly higher (HR = 2.85, 95% CI, 2.23-3.66, p < 0.001) than the NC group. When the Dep-CD group was compared to the CD-only group, the HR was 1.13 (95% CI, 0.85-1.49, n.s.), which indicates that it did not significantly differ from the CD-only group.Conclusions: Our findings suggest that depressive symptoms with cognitive dysfunction are associated with a higher risk of cognitive impairment. Furthermore, cognitive dysfunction occurring with depressive symptoms is as much a risk for cognitive impairment as is pure cognitive dysfunction. Thus, healthcare providers should pay close attention to the community-dwelling elderly when depressive symptoms occur with cognitive dysfunction. [ABSTRACT FROM AUTHOR]

This study examined if the association between older parents' assets and life satisfaction is mediated by multiple children's adult status attainment, given increasingly complicated processes of transition to adulthood and diminishing returns for parents' extended investment in adult children. Disparate bodies of literature have indicated that assets help promoting older adults' individual health and well-being; and parental assets also facilitate children's reaching of adulthood. However, little attention has been paid to the ways in which the association between assets and life satisfaction might be explained by multiple children's adult role statuses. Using the 5th wave of the Korean Longitudinal Study of Ageing (2014), this study analyzed a sample of parents aged 60 years and older with at least one living child aged between 30 and 50. For analyses, mediation models were estimated using SPSS PROCESS. Results showed that the association between non-financial assets and life satisfaction was partially mediated by one or more grown children's college graduation and home ownership. Children's employment, marriage, and parenthood did not play a major role in explicating the link between assets and life satisfaction in the contemporary socioeconomic context of Korea. Regarding policy and practice implications, comprehensive asset-building programs should be offered for parents to financially prepare for old age; parents should be informed that their overall life quality may hinge less on the lives of their children than might be typically expected, thus necessitating a more tailored approach to financially supporting their children during their transition to adulthood. [ABSTRACT FROM AUTHOR]

Background: The importance of SA (Successful aging) has been emphasized in recent years, with focus shifting towards attaining healthier aging rather than longevity. However, the influence of SA and its changes on mental health such as depression remains a relatively unexplored area in gerontology. Therefore, we investigated the longitudinal association between changes in SA and depressive symptoms in Korean older adults.Methods: This study comprised a longitudinal sample of older adults aged ≥ 45 years, drawn from the Korean Longitudinal Study of Aging (2006-2018). Changes in SA status was determined using the Rowe and Kahn model over two consecutive years. Using an adjusted generalized estimating equation model, we examined the association between changes in successful aging status, namely SA and NSA (Non-successful aging), and depressive symptoms.Results: Compared to the SA→SA group, depressive symptom risk in the NSA→NSA and SA→NSA groups were higher in men [(OR, 1.16; 95 % CI, 1.13-1.18), (OR, 1.11; 95 % CI, 1.08-1.13), respectively] and in women [(OR, 1.15; 95 % CI, 1.13-1.18), (OR, 1.11; 95 % CI, 1.09-1.14), respectively]. Subgroup analysis of the dimensions of successful aging revealed that low or worsening criteria of successful aging status in men and women were associated with depressive symptoms.Conclusions: Korean older adults who continuously failed to attain or maintain successful aging status had the highest risk of depressive symptoms. These results could further assist in establishing policies and interventions that promote successful aging and subsequently protect the mental health of the Korean older adult population. [ABSTRACT FROM AUTHOR]

Objectives Heterogeneity in successful aging has been found across countries. Yet, comparable evidence is sparse except in North America and Europe. Extending prior research, this study examined the prevalence and correlates of successful aging in East Asia: China, Korea, and Japan. Method We used harmonized data sets from national surveys. A total of 6,479 participants (aged between 65 and 75) were analyzed. Using Rowe and Kahn's (1987 , 1997) model, successful aging was defined as having no major diseases, no difficulty performing activities of daily living, obtaining a median or higher score on tests of cognitive function, and being actively engaged. Results The average prevalence of successful agers was 17.6%. There were variations in the global and specific measures of successful aging within and across countries, even after controlling for individual sociodemographic factors (age, gender, and education). The odds of aging successfully were highest in Japan and lowest in China, especially in the rural areas. Being younger and males were associated with a higher likelihood of successful agers in both global and specific measures. Discussion This study observed heterogeneity in successful aging in East Asia. To identify policy implications, future research should explore potential societal factors influencing individuals' opportunities for successful aging. [ABSTRACT FROM AUTHOR]

Background: Recent studies have shown that long working hours can have adverse consequences on health and possibly trigger biological processes that mediate the relationship between long working hours and cognitive decline.Objective: To investigate whether long working hours and the overall duration such exposure is associated with a decline in cognitive function.Methods: Data obtained during the Korean Longitudinal Study on Aging (n = 2,518) during the period 2006-2018 were used to explore the relationship between long working hours and cognitive decline. Korean version of the Mini-Mental State Examination (K-MMSE) scores were used to evaluate cognitive function. Cox proportional hazard regression models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs), which were used to evaluate declines in K-MMSE scores over the 12-year study period.Results: Overall HR (95% CI) for a decline in cognitive function in long working hours group was 1.13 (0.73-1.17). When categorized by sex, women with long working hours had an HR (95% CI) of 1.50 (1.05-2.22), K-MMSE scores decreased significantly after working long hours for 5 years (p < 0.01).Conclusion: The study furthers understanding of the effects of long working hours on cognitive decline among female workers. Further research is required to determine the effects of long working hours on cognitive functions. [ABSTRACT FROM AUTHOR]

Despite substantial research on numerous aspects of health in the elderly, past studies that examined the association between handgrip strength and mortality have been conducted with samples drawn mostly from Caucasian populations, and little is known about whether similar trends are found in non-Western contexts such as Korea. The present study drew data from KLoSA (Korean Longitudinal Study of Aging), a nationally representative sample of middle-aged adults, and followed up for a decade. Results from discrete-time event history analysis of mortality indicated that higher handgrip strength significantly reduces the likelihood of death in both men and women. Men in the highest third of handgrip strength were 53.9% less likely to experience death than those in the lowest third. Women followed a similar pattern: middle and high handgrip strength reduced the odds by 26.4% and 48.3%, respectively. These findings suggest that handgrip strength has a significant impact on elderly mortality and does so in a negatively gradient manner. [ABSTRACT FROM AUTHOR]

• Individuals with a fear of falling do not always have cognitive decline. • Depressive symptoms with fear of falling increase the risk of cognitive decline. • Cognitive decline was more common in subjects with depression and fear of falling. This study aimed to investigate the effects of fear of falling (FOF) on cognitive decline in older adults in the Korean community, depending on the presence of accompanying depressive symptoms. A total of 6263 individuals were included in the final analysis. Based on their baseline evaluation results for depressive symptoms and FOF, the subjects were divided into four groups: "normal control" (NC, n = 3783), "depression only" (Dep-only, n = 291), "fear of falling only" (FOF-only, n = 1755), and "depression with fear of falling" (Dep-FOF, n = 434). Cognitive decline was defined as a loss of more than three points in the K-MMSE score in participants with at least two years of follow-up. We examined the association between FOF accompanied by depressive symptoms and cognitive decline using a multivariate Cox proportional hazard model. Cognitive decline occurred in 76.3%, 68.5%, 63.9%, and 56.4% of the Dep-FOF, FOF-only, Dep-only, and NC groups, respectively. Our findings suggest that individuals with FOF do not always have cognitive decline (HR = 1.03, 95% CI = 0.95–1.12, P = 0.43) compared to individuals without FOF. Furthermore, depressive symptoms with FOF are associated with a higher risk of cognitive decline (HR = 1.23, 95% CI = 1.08–1.41, P = 0.002) in community-dwelling older adults in Korea. Healthcare providers should be attentive to community-dwelling older adults who experience both depressive symptoms and FOF because our findings suggest that this unique combination increases the risk of cognitive decline. [ABSTRACT FROM AUTHOR]

Purpose: To investigate the gender-specific associations between perceived vision impairment and symptoms of depression. Methods: We used the data from the 2012 Korean Longitudinal Study of Aging database of 7448 individuals aged 45 years and older. Questionnaires assessing depression symptoms and perceived visual impairment at near, distance, and in general were administered. Logistic regression analyses were used to evaluate if visual impairment could lead to depression, adjusting for the potential confounders of age, socioeconomic status (household income, education level, marital status, and employment status), and health behaviors (alcohol consumption, smoking, and physical activity level) after gender stratification. Results: Perceived general and near vision impairment were significantly associated with symptoms of depression in males (odds ratio [OR] = 2.78 and 2.54; 95% confidence interval [CI], 1.91-4.04 and 1.78-3.63). Perceived general and distance vision impairment were significantly associated with symptoms of depression in females (OR = 2.16 and 2.08; 95% CI, 1.67-2.79 and 1.61-2.69). General sight with near vision impairment in males and general sight with distance vision impairment in females could be stronger predictors of depression than other vision impairment combinations (area under the receiver operating characteristic curve [AUROC], 0.6461; p = 0.0425 in males; AUROC, 0.6270; p = 0.0318 in females). Conclusion Gender differences were found in the characteristics of visual impairment on symptoms of depression. Ophthalmologists should be aware that near vision impairment in males and distance vision impairment in females have an adjunctive effect that might contribute to symptoms of depression. [ABSTRACT FROM AUTHOR]

• Relative handgrip strength is significantly associated with cardiovascular disease in middle-aged and older adults. • Weak grip strength may be a useful indicator of cardiovascular disease risk in men and women aged 45 years or older. • This study identified new cut-points based on the relative handgrip strength for cardiovascular disease. Aging causes both structural and functional changes in the skeletal muscle, and is associated with changes in body composition form, which results in an increased incidence of cardiovascular death. Handgrip strength (HGS) is a simple, fast, reliable, and cost-effective tool for measuring muscle strength. We aimed to investigate which index was most suitable for predicting cardiovascular disease (CVD), and suggested the optimal cut-off points based on the handgrip strength index. In addition, we aimed to identify the effects of weak HGS, as determined by applying the optimal cut point on the occurrence of CVD. A total of 8494 older men and women aged over 45 years from the Korean Longitudinal Study of Aging (KLoSA) were included in this study at baseline. We performed general estimating equations (GEE) with independent correlation structure to assess whether handgrip strength is longitudinally related to occurrence of CVDs such as heart disease or stroke reported from 1 st to 6th wave of KLoSA. The relative HGS was strongly associated with CVD in both sexes, and the best fit model was in that in comparison to dominant HGS and absolute HGS. In addition, we calculated the optimal cut point for CVD based on the relative HGS in this study (men: 2.52 and women: 1.55, respectively), and demonstrated that low HGS, as determined by applying relative HGS cut points, was associated with a higher OR for CVD compared to normal HGS; the associations observed were consistent between the sexes. Our findings suggest that HGS has the potential to be a valuable screening tool for cardiovascular risk in clinical settings; this is advantageous in situations where blood sampling is not possible since HGS is easily measured and highly reproducible. It is necessary to pay attention to weak grip strength against body size in the elderly population. [ABSTRACT FROM AUTHOR]