Big Five Personality Traits, Social Networks, and Depression Among Older Adults in Japan: A Multiple Mediation Analysis.

This study examines the mediating effect of social network size on depression among older adults in Japan in association with the Big Five personality traits: extraversion, agreeableness, conscientiousness, neuroticism, and openness. Cross-sectional data were obtained from 739 older adults (Mean age = 75.13, SD = 6.86) residing in Tokyo. Multiple mediation analyses estimated total, indirect, and direct effects between personality and depression. Extraversion was associated with the number of kin and friend networks and agreeableness with the number of kin networks. Moreover, these social networks partially mediated the effects of extraversion and agreeableness on depression. The findings show that personality traits such as extraversion and agreeableness are associated with social network size, which contributes to better mental health in old age.

[Psychosocial mediators between socioeconomic status and oral health among urban-dwelling older adults].

Objectives　This study examined the psychosocial mediators that most effectively mediate the socioeconomic status (SES)-based differences in oral health (OH) among urban-dwelling older adults.Methods　A representative sample of individuals aged ≥65 years living in two areas with different residential SES in Tokyo produced 739 effective participants. OH was based on the total score of subjective sense of health, number of remaining teeth, and oral function. SES was evaluated by education and income. Based on the socioecological model, mediators were assessed using self-esteem, social support, and depression.Results　 Based on the multiple mediation analysis, no significant effects were observed for specific psychosocial factors. However, the overall psychosocial factors showed significant effects as the mediating factor between income and OH. The mediating effect of overall psychosocial factors was not significant regarding years of education and oral health.Conclusion　A hybrid of life-stage preventive activities and overall reduction of psychosocial risk factors may eliminate the differences in OH by SES.

[The application and usefulness of virtual reality aimed at encouraging an understanding of and reducing and eliminating prejudice towards dementia patients among local residents].

AIM: To demonstrate the usefulness of a virtual reality device that authentically portrays the emotions of dementia patients and their families (VR Dementia Experience) for encouraging an understanding of and reducing and eliminating prejudice towards dementia patients among local residents. METHOD: In Prefecture T, Town N, 85 residents of Neighborhood A were chosen as the intervention group, and 95 residents of Neighborhood B were chosen as the non-intervention group. The VR Dementia Experience was provided only to the residents of Neighborhood A. Residents of both neighborhoods completed a 35-item questionnaire regarding their degree of understanding and prejudice towards dementia patients before and after the intervention. RESULTS: Seventy-seven residents of Neighborhood A and 82 residents of Neighborhood B were analyzed. Their gender, age, and pre-intervention test baseline values were equivalent in the degree of understanding and prejudice. Significant increases were observed in 9 of 35 items for Neighborhood A residents (7 understanding-related, 2 prejudice-related) and 2 items for Neighborhood B residents (1 understanding-related, 1 prejudice-related). To ascertain the usefulness of the VR Dementia Experience, we compared the number of items with a significant increase: 9/35 (25.7%) in Neighborhood A and 2/35 (5.7%) in Neighborhood B. An effect (≥ 20%) was observed among the residents of Neighborhood A. Furthermore, after exposure to the VR Dementia Experience, the connection between understanding, prejudice, and dementia was strengthened among the residents of Neighborhood A compared to the residents of Neighborhood B. CONCLUSION: The VR Dementia Experience is a useful tool for encouraging an understanding of and reducing and eliminating prejudice towards dementia patients among local residents. However, to encourage the widespread usage of the technology, we should compare results with other public awareness campaigns as well as make improvements to the device and its VR content.

Socioeconomic status and self-rated health of Japanese people, based on age, cohort, and period.

BACKGROUND: Differences in health resulting from differences in socioeconomic status (SES) have been identified around the world. Age, period, and cohort (A-P-C) differences in health are vital factors which are associated with disparities in SES. However, few studies have examined these differences simultaneously. Moreover, although self-rated health (SRH) has been frequently used as an indicator of health, biases in reporting SRH that depend on the socioeconomic characteristics of respondents have been scarcely adjusted in the previous studies. To overcome these limitations, we investigated the associations between disparities in SES and adjusted SRH based on A-P-C, by using a repeated, cross-sectional survey of a nationally representative sample of Japanese people. In addition, we further investigated how exogenous (macroeconomic) conditions unique to a period or cohort would explain trends across successive periods and cohorts. METHODS: Data were obtained from a sample of 653,132 Japanese people that responded to the Comprehensive Survey of Living Conditions (CSLC), which is a cross-sectional survey that had been conducted every three years from 1986 to 2013, on over 10 occasions. In the CSLC, SES has been assessed by household income. We simultaneously controlled for each A-P-C dimension by using the model for cross-classification of random effects, and adjusting SRH data for reporting biases caused by differences in income and A-P-C. RESULTS: Differences in adjusted SRH associated with income differences decreased with age and reversed after 76 years of age. Period differences indicated that income differences peaked in 1992 and 2007. Moreover, differences in adjusted SRH associated with income differences decreased in periods with high unemployment across all periods. Furthermore, there were no cohort differences in adjusted SRH that were associated with income differences. CONCLUSION: In Japan, there are age and period variations associated with adjusted differences in SRH as assessed by income. Moreover, exogenous conditions in each period could help explain periodic trends across successive periods.

Current status of collaborative relationships between dialysis facilities and dental facilities in Japan: results of a nationwide survey.

BACKGROUND: Recent studies have reported an association between periodontal disease and mortality among dialysis patients. Therefore, preventive dental care should be considered very important for this population. In Japan, no systematic education has been undertaken regarding the importance of preventive dental care for hemodialysis patients--even though these individuals tend to have oral and dental problems. The aim of this study was to investigate the current state of collaborative relationships between hemodialysis facilities and dental services in Japan and also to identify strategies to encourage preventive dental visits among hemodialysis outpatients. METHODS: A nationwide questionnaire on the collaborative relationship between dialysis facilities and dental facilities was sent by mail to all medical facilities in Japan offering outpatient hemodialysis treatment. RESULTS: Responses were obtained from 1414 of 4014 facilities (35.2%). Among the 1414 facilities, 272 (19.2%) had a dental service department. Approximately 100,000 dialysis outpatients were receiving treatment at these participating facilities, which amounts to one-third of all dialysis patients in Japan. Of those patients, 82.9% received hemodialysis at medical facilities without dental departments. Only 87 of 454 small clinics without in-house dental departments (19.2%) had collaborative registered dental clinics. Medical facilities with registered dental clinics demonstrated a significantly more proactive attitude to routine collaboration on dental matters than facilities lacking such clinics. CONCLUSIONS: Our nationwide survey revealed that most dialysis facilities in Japan have neither an in-house dental department nor a collaborative relationship with a registered dental clinic. Registration of dental clinics appears to promote collaboration with dental facilities on a routine basis, which would be beneficial for oral health management in hemodialysis patients.

Factors associated with diabetes control : results of a 2-year cohort study of outpatients with type 2 diabetes.

Type 2 diabetes is a typical lifestyle disease. We aimed to identify the factors affecting glycemic control in 64 outpatients with type 2 diabetes over a 2-year period. We defined poor glycemic control using a change in glycosylated hemoglobin (?HbA1c) of ??0.5% over 2 years and/or HbA1c ??7.5% at the end of the study period. We used a questionnaire to collect information on oral health behavior and lifestyle, including eating and smoking habits, and analyzed the relationships between indices of diabetes control and responses to the questionnaire. The mean (SD) HbA1c of the participants was 6.87% (0.77%) at a baseline, and 6.93% (0.69%) after 2 years. Twenty-three participants (36.0%) had poor glycemic control. ?HbA1c and the change in body mass index (?BMI) correlated (Spearman's rank correlation, r?=?0.350, p?

Mediators of Life-Course and Late-Life Financial Strain on Late-Life Health in Japan: Based on a Cross-Sectional Survey.

Purpose: Few studies have examined together the psychosocial mediators of how life-course and late-life socioeconomic status (SES) influence late-life health. This study explored psychosocial mediators of influences of not only life-course but also late-life financial strain on late-life health in Japan, using a cross-sectional survey. It was hypothesized that: 1) both life-course and late-life financial strain will influence late-life health through common mediators, and 2) such mediating influences will be large on health indicators strongly related to psychosocial resources, such as depressive tendencies and self-rated health. Methods: The participants (N = 739) were aged 65 years and older and lived in metropolitan Tokyo, Japan. Life-course financial strain was measured retrospectively by the number of financially strenuous experiences over the participants' life-courses. Possible mediators included stressors (life-course and late-life major traumatic life events) and psychosocial resources (self-esteem, sense of control, health literacy, social networks, and social support). Health indicators included multimorbidity, disabled activities of daily living (ADL), depressive tendency, and poorer self-rated health. Results: Having a sense of control mediated the significant influences of both life-course and late-life financial strain on disabled ADL. Furthermore, self-esteem significantly mediated the influences of both life-course and late-life financial strain on depressive tendencies and poorer self-rated health. All such mediating influences were significant at p < 0.05. Psychosocial resources did not mediate significant influences of life-course and financial strain on multimorbidity. Conclusion: The results support our hypotheses and make three main contributions on the mechanism through which SES influences late-life health: 1) psychosocial resources mediate the effect of life-course SES on late-life health; 2) the influence differs depending on health type; and 3) these results can generalize to older adults in not only Japan but also Western countries.

Effect of Jersey cow defatted dry milk on salivary volume and composition in elderly persons†:†a pilot study.

The administration of Leu57-Leu58-His59-Lys60 (LLHK), Leu58-His59-Lys60 (LHK), and His59-Lys60 (HK) from ß-lactoglobulin C variant, which is specific to Jersey cow milk, has been shown to prevent and/or restore the age-dependent atrophy and functional decline of salivary glands by affecting gene expression in elderly rats. In this study, we investigated the effect of Jersey cow defatted milk on salivary volume and composition in elderly persons. Participants (aged 85 to 98, n = 8) were administered defatted dry milk from Jersey cows twice a day for 4 weeks. Before and after 4 weeks from the start of drinking, saliva was collected and weighed. Salivary cystatin S and amylase levels were analyzed by Western blotting. To assess the effect of Jersey cow defatted milk on taste perception, questionnaires were used. Salivary volume after oral administration of 40 g of Jersey cow defatted dry milk daily for 4 weeks was 1.8 times higher than that before administration. Salivary cystatin S and amylase levels significantly increased after administration of Jersey cow defatted dry milk. Moreover, all participants who had taste impairment reported improved taste perception after administration. The administration of Jersey cow defatted dry milk increased salivary volume and changed the composition of saliva in elderly persons. Furthermore, it improved taste perception. J. Med. Invest. 68 : 280-285, August, 2021.

Association between diabetes-related clinical indicators and oral health behavior among patients with type 2 diabetes.

Objective : The aim of this study was to evaluate the association between diabetes-related indicators and oral health behavior among patients with type 2 diabetes. Methods : Seventy-four outpatients were included. We administered a questionnaire and divided the patients into two groups according to oral health behavior and eating habits. We then compared diabetes-related clinical records between the groups and performed logistic regression analysis. Results : Participants who brushed their teeth before bedtime every night had lower BMIs than those who did not. Participants who reported eating slowly and chewing well every day had significantly lower HbA1c than their counterparts. Participants who reported gum bleeding had significantly higher LDL-cholesterol than their counterparts. Binominal logistic regression analysis revealed that BMI < 25 was associated with not brushing teeth before bedtime every night, HbA1c < 7.5 with not eating slowly or chewing well every day, and LDL-cholesterol < 120 with gum bleeding (odds ratio : 0.140, 95% confidence interval : 0.036-0.540 ; OR : 0.085, 95% CI : 0.010-0.736, OR : 0.275, 95% CI : 0.077-0.979, respectively). Conclusions : Our findings suggest that toothbrushing before bedtime every night is associated with reduced risk of obesity and that eating slowly and chewing well are advantageous for glycemic control in patients with type 2 diabetes.J. Med. Invest. 68 : 140-147, February, 2021.

Time perspectives as mediators of the associations between socio-economic status and health behaviours in older Japanese adults.

Objective: Few studies have used time perspective (TP) theory to examine the factors mediating the association between socio-economic status (SES) and health behaviours (i.e. the psychological mechanisms that underlie SES differences in health behaviours). The purpose of this study was to examine the mediating effects of TPs on the relationship between SES and health behaviours in older Japanese adults. Design: In total, 761 participants living in the Tokyo metropolitan area participated in face-to-face interviews in 2016. Outcome measures: Health behaviours were measured using three indicators: participation in exercise, healthy dietary habits and smoking status. SES was composed of educational attainment and annual income. TPs were measured using the Zimbardo Time Perspective Inventory, which consisted of five subcategories: the past-negative, past-positive, present-hedonistic, present-fatalistic and future perspectives. Results: Among these five subcategories, none mediated both SES and health behaviours. Conclusion: TPs might not contribute to the appearance of SES differences in health behaviours in older adults.

Social Networks' Health Habits Over Life Course and Late-life Health Habits.

Objectives: In this study, we examined Japanese older adults' health habits (healthy diet, exercise, and nonsmoking) using 4 models: sensitive period, pathway, social mobility, and cumulative effects. Methods: A representative cross-sectional survey of people 65 years and older, living in Tokyo, produced 739 effective respondents. Health habits in social networks over the life course, at junior high school, age 20, and age 40, were measured through retrospective recall questions. Ordinary regression and logistic regression were used separately to analyze healthy diet and exercise/nonsmoking. Results: Regarding pathway effects, standardized coefficients of indirect health habits in social networks on late-life health habits were healthy diet = .073 (p < .05) and exercise = .125 (p < .001). Regarding social mobility effects, standardized coefficients of change to poorer health habits in social networks over the life course on late-life health habits, compared to maintaining healthy habits were healthy diet = -.121 (p < .01) and exercise e= -.235 (p < .05). Regarding cumulative effects, standardized coefficients of no exposure to better health habits in social networks over the life course were healthy diet = -0.103 (p < .01) and exercise = -.395 (p < .01). Conclusions: Three models - pathway, social mobility, and cumulative effects - may explain how healthy diet and exercise in social networks over the life course influence these health habits in later life.

Association between Oral Health Status and Diabetic Nephropathy-Related Indices in Japanese Middle-Aged Men.

Oral health status is known to be associated with lifestyle-related diseases such as diabetes and chronic kidney disease. In Japan, around 40% of hemodialysis cases are patients with diabetic nephropathy. The aim of this study was to clarify the association between oral health status and diabetic nephropathy-related indices in Japanese middle-aged men. Sixty-six men (age range: 55-64 years) with ≥20 remaining teeth and who received public medical checkups and oral examinations were enrolled. We examined correlations of age, body mass index, HbA1c, HDL-C, LDL-C, neutral fat, serum creatinine, and the estimated glomerular filtration rate (eGFR) with the number of remaining teeth or the community periodontal index (CPI) score (periodontal pocket < 4 mm: 0, 4-6 mm: 1, ≥6 mm: 2). A positive correlation between the CPI score and serum creatinine and a negative correlation between CPI score and eGFR (Spearman's rank correlation coefficient, r = 0.459, p < 0.01, and r = -0.460, p < 0.01, respectively) were observed. The mean eGFR in the CPI score 0 group was significantly higher than that in the CPI score 1/2 group (82.6 vs. 70.7, Student's t-test, p < 0.01). Logistic regression analysis using eGFR as a dependent variable and age, CPI score, body mass index, HbA1c, and neutral fat as independent variables suggested that low eGFR (<60) could be attributed to CPI score (OR = 3.169, 95% CI: 1.031-9.742, p = 0.044). These results suggest a possible association between periodontal status and renal function in Japanese middle-aged men. Periodontal condition is controlled by oral prophylaxis, and periodontal disease and chronic kidney disease have some common risk factors. Thus, periodontal management can contribute to the prevention of severe chronic kidney disease.

Survey on Nursing Home Caregivers' Basic Knowledge of Oral Health Management: Dental Terminology.

With the increasing numbers of the elderly requiring care in Japan, the management of their oral health care will require cooperation between medical and dental professionals, and we need to transfer dental knowledge from dental professionals to caregivers. With the help of a questionnaire, we examined 181 caregivers' depth of understanding regarding 20 typical dental terms with a view to improving the educational instruction provided to them. It was found that except for "clasp", popular dental terms have largely been accepted. The differences in their degrees of understanding could be owing to the lack of systematic education for caregivers.

Socioeconomic status disparities in late-life disability based on age, period, and cohort in Japan.

INTRODUCTION: Effects of disparities in socioeconomic status (SES) on late-life disabilities have been reported around the world. However, there are only a few studies that have examined age, period, and cohort dependent influences of SES disparities on late-life disabilities. We investigated associations between SES disparities and late-life disability based on the Age-Period-Cohort. We also investigated how macro-economic conditions unique to a period, or a cohort might explain the period or the cohort trends. METHODS: Data were obtained from people aged 65 and over that responded to the Comprehensive Survey of Living Conditions, which had been conducted every three years from 1989 to 2013. SES was assessed via household income. Disability was assessed as disabilities in performing Basic Activities of Daily Living (BADL). Income disparities were evaluated by the slope index of inequality (SII) and the relative index of inequality (RII). Each Age-Period-Cohort dimension was simultaneously controlled using a model for cross-classification of random effects. RESULTS: Differences in BADL disabilities due to income disparities decreased with age and reversed after approximately 80 years of age. Income disparities in BADL disability changed across periods, by increasing in periods with a high unemployment rate, which started two to four years before the period. Moreover, results of using SII and RII were nearly identical. CONCLUSIONS: Higher mortality in elderly with lower income might be related to a reduction of income disparities in BADL disability in Japan. Furthermore, exposure to harsh economic conditions might contribute to increased disparities in BADL disability a few years later.

Social Support, Negative Interactions, and Mental Health: Evidence of Cross-Domain Buffering Effects Among Older Adults in Japan.

This study examined the additive effects of social support and negative interactions in various relationship domains and the cross-domain buffering effects of social support on the detrimental impact of negative interactions on mental health among older adults in Japan. Data were obtained from a survey of residents of 30 municipalities in the Tokyo metropolitan area ( N = 1,592). The results indicated that family members living together may share ambivalent social ties, anchored in positive sentiments and serving as sources of support but where criticism and excessive demands may occur. We found that negative interactions had a more potent additive effect on mental health. Moreover, the interaction effects of negative interactions with family and social support from other relatives suggested reverse buffering. Our findings suggest that interventions might be more necessary to cope with the negative social exchanges of close kin relationships among the elderly Japanese.

Development of an Oral Assessment Sheet for Evaluating Older Adults in Nursing Homes.

A new general use oral assessment sheet (OAS), comprising three items each in three categories (i.e., oral hygiene, biting and chewing, and oral function), was developed to improve the oral health of older adults requiring nursing care. Seventy-nine care workers used the assessment sheet to evaluate oral conditions in 188 institutionalized older adults. Forty-five care workers and three dental professionals then assessed oral conditions in 45 institutionalized older adults using the test-retest method before and after dental professional guidance. Cronbach's alpha of the OAS was 0.72, and 0.65, 0.57, and 0.82 for the three subcategories of oral hygiene, biting and chewing, and oral function, respectively. After dental professional intervention, absolute and relative agreement coefficients increased to more than 0.6 and 0.89, respectively. Reliability and validity of the OAS were verified, and difficulties in oral assessment experienced by care workers were identified. [Res Gerontol Nurs. 2017; 10(5):234-239.].

Factors associated with regular dental visits among hemodialysis patients.

AIM: To investigate awareness and attitudes about preventive dental visits among dialysis patients; to clarify the barriers to visiting the dentist. METHODS: Subjects included 141 dentate outpatients receiving hemodialysis treatment at two facilities, one with a dental department and the other without a dental department. We used a structured questionnaire to interview participants about their awareness of oral health management issues for dialysis patients, perceived oral symptoms and attitudes about dental visits. Bivariate analysis using the χ(2) test was conducted to determine associations between study variables and regular dental check-ups. Binominal logistic regression analysis was used to determine factors associated with regular dental check-ups. RESULTS: There were no significant differences in patient demographics between the two participating facilities, including attitudes about dental visits. Therefore, we included all patients in the following analyses. Few patients (4.3%) had been referred to a dentist by a medical doctor or nurse. Although 80.9% of subjects had a primary dentist, only 34.0% of subjects received regular dental check-ups. The most common reasons cited for not seeking dental care were that visits are burdensome and a lack of perceived need. Patients with gum swelling or bleeding were much more likely to be in the group of those not receiving routine dental check-ups (χ(2) test, P < 0.01). Logistic regression analysis demonstrated that receiving dental check-ups was associated with awareness that oral health management is more important for dialysis patients than for others and with having a primary dentist (P < 0.05). CONCLUSION: Dialysis patients should be educated about the importance of preventive dental care. Medical providers are expected to participate in promoting dental visits among dialysis patients.