Factors associated with the introduction of visiting-pharmacist services in older adults in Japan: A nested case-control study.

AIM: To investigate the factors associated with introducing visiting-pharmacist services for community-dwelling older adults in Japan. METHODS: We conducted a nested case-control study using claims data in a cohort from a city in Tokyo. Patients aged ≥65 years who received visiting-pharmacist services for the first time between April 2014 and March 2020 were considered case patients. A maximum of four controls to each case patient were randomly selected on the basis of sex, age, health insurance systems, and month-year. Medical and long-term care service usage and patient condition were assessed using claims data from the index and preceding months, along with long-term care needs certification data. Multivariable conditional logistic regression analysis was conducted to estimate the adjusted odds ratios with 95% confidence intervals for factors associated with visiting-pharmacist service introduction. RESULTS: A total of 22 949 participants (4591 cases and 18 358 controls) were included, with a median age of 85 years; 59.3% were women. The adjusted odds ratios (95% confidence intervals) of the three most related factors were 27.61 (23.98-31.80) for physicians' home visits, 5.83 (5.08-6.70) for hospitalization, and 4.97 (4.16-5.95) for designated-facility admission. Factors such as prescribing ≧10 medications, visiting nursing, and cancer were positively associated. In contrast, low household income and a high need for support due to cognitive function or disability were negatively associated. CONCLUSIONS: This study provides insights into the introduction of visiting-pharmacist services for older adults in Japan. Geriatr Gerontol Int 2024; 24: 344-351.

Association of coexistence of frailty and depressive symptoms with mortality in community-dwelling older adults: Kashiwa Cohort Study.

OBJECTIVES: This study aimed to determine the longitudinal associations of the coexistence of frailty and depressive symptoms with mortality among older adults. METHODS: The study participants were community-dwelling older adults aged ≥65 years who participated in the baseline survey of the Kashiwa Cohort Study in Japan in 2012. We used Fried's frailty phenotype criteria to classify participants as non-frail (score = 0), pre-frail (1 or 2), or frail (≥3). Depressive symptoms were assessed using the GDS-15 (≥6 points). Cox proportional hazards models were used to evaluate the association of co-occurring frailty and depressive symptoms with all-cause mortality, after adjusting for sociodemographic and clinical characteristics. RESULTS: The study included 1920 participants, including 810 non-frail, 921 pre-frail, and 189 frail older adults, of which 9.0 %, 15.7 %, and 36.0 %, respectively, had depressive symptoms. Ninety-one (4.7 %) participants died during the average follow-up period of 4.8 years. Compared with non-frail participants without depressive symptoms, frail participants had greater adjusted hazard ratios for mortality: 2.47 (95 % CI, 1.16 to 5.25) for frail participants without depressive symptoms and 4.34 (95 % CI, 1.95 to 9.65) for frail participants with depressive symptoms. However, no statistically significant associations were observed in non-frail or pre-frail participants irrespective of depressive symptoms. CONCLUSION: Frail older adults with depressive symptoms have a substantially greater risk of mortality. Screening for depressive symptoms and frailty in older adults should be incorporated into health checkups and clinical practice to identify high-risk populations.

Symptomatic and preventive medication use according to age and frailty in Australian and Japanese nursing homes.

OBJECTIVE: To investigate symptomatic and preventive medication use according to age and frailty in Australian and Japanese nursing homes (NHs). METHODS: Secondary cross-sectional analyses of two prospective cohort studies involving 12 Australian NHs and four Japanese NHs. Frailty was measured using the FRAIL-NH scale (non-frail 0-2; frail 3-6; most-frail 7-14). Regular medications were classified as symptomatic or preventive based on published lists and expert consensus. Descriptive statistics were used to compare the prevalence and ratio of symptomatic to preventive medications. RESULTS: Overall, 550 Australian residents (87.7 ± 7.3 years; 73.3% females) and 333 Japanese residents (86.5 ± 7.0 years; 73.3% females) were included. Australian residents used a higher mean number of medications than Japanese residents (9.8 ± 4.0 vs 7.7 ± 3.7, p < 0.0001). Australian residents used more preventive than symptomatic medications (5.5 ± 2.5 vs 4.3 ± 2.6, p < 0.0001), while Japanese residents used more symptomatic than preventive medications (4.7 ± 2.6 vs 3.0 ± 2.2, p < 0.0001). In Australia, symptomatic medications were more prevalent with increasing frailty (non-frail 3.4 ± 2.6; frail 4.0 ± 2.6; most-frail 4.8 ± 2.6, p < 0.0001) but less prevalent with age (< 80 years 5.0 ± 2.9; 80-89 years 4.4 ± 2.6; ≥ 90 years 3.9 ± 2.5, p = 0.0042); while preventive medications remained similar across age and frailty groups. In Japan, there was no significant difference in the mean number of symptomatic and preventive medications irrespective of age and frailty. CONCLUSIONS: The ratio of symptomatic to preventive medications was higher with increasing frailty but lower with age in Australia; whereas in Japan, the ratio remained consistent across age and frailty groups. Preventive medications remained prevalent in most-frail residents in both cohorts, albeit at lower levels in Japan.

Association of housing adaptation services with the prevention of care needs level deterioration for older adults with frailty in Japan: a retrospective cohort study.

BACKGROUND: Housing adaptations are aimed at minimizing the mismatch between older adults' functional limitations and their building environments. We examined the association of housing adaptations with the prevention of care needs level deterioration among older adults with frailty in Japan. METHODS: The subjects comprised individuals who were first certified as having care support levels (defined as frail, the lowest two of seven care needs levels) under the public long-term care insurance systems between April 2015 and September 2016 from a municipality close to Tokyo. The implementation of housing adaptations was evaluated in the first six months of care support certification. Survival analysis with Cox proportional hazards model was performed to examine the association between housing adaptations and at least one care needs level deterioration, adjusting for age, sex, household income level, certified care support levels, cognitive function, instrumental activities of daily living, and the utilization of preventive care services (designed not to progress disabilities). We further examined the differences in the association of the housing adaptation amount by categorizing the subjects into the maximum cost group (USD 1,345-1,513) or not the maximum cost group (< USD 1,345). All the subjects were followed until the earliest of deterioration in care needs level, deaths, moving out of the municipality, or March 2018. RESULTS: Among 796 older adults, 283 (35.6%) implemented housing adaptations. The incidence of care needs level deterioration was 19.3/1000 person-month of older adults who implemented housing adaptations, whereas 31.9/1000 person-month of those who did not. The adjusted hazard ratio (aHR) of care needs level deterioration was 0.69 (95% confidence interval (CI): 0.51-0.93). The aHRs were 0.51 (95% CI: 0.31-0.82) and 0.78 (95% CI: 0.57-1.07) in the maximum and not maximum cost groups, respectively. CONCLUSIONS: Housing adaptations may prevent care needs level deterioration of older adults with frailty. Policymakers and health professionals should deliver housing adaptations for older adults at risk of increasing care needs.

All-Cause Readmission or Potentially Avoidable Readmission: Which Is More Predictable Using Frailty, Comorbidities, and ADL?

Background and Objectives: Readmission-related health care reforms have shifted their focus from all-cause readmissions (ACR) to potentially avoidable readmissions (PAR). However, little is known about the utility of analytic tools from administrative data in predicting PAR. This study determined whether 30-day ACR or 30-day PAR is more predictable using tools that assess frailty, comorbidities, and activities of daily living (ADL) from administrative data. Research Design and Methods: This retrospective cohort study was conducted at a large general acute care hospital in Tokyo, Japan. We analyzed patients aged ≥70 years who had been admitted to and discharged from the subject hospital between July 2016 and February 2021. Using administrative data, we assessed each patient's Hospital Frailty Risk Score, Charlson Comorbidity Index, and Barthel Index on admission. To determine the influence of each tool on readmission predictions, we constructed logistic regression models with different combinations of independent variables for predicting unplanned ACR and PAR within 30 days of discharge. Results: Among 16 313 study patients, 4.1% experienced 30-day ACR and 1.8% experienced 30-day PAR. The full model (including sex, age, annual household income, frailty, comorbidities, and ADL as independent variables) for 30-day PAR showed better discrimination (C-statistic: 0.79, 95% confidence interval: 0.77-0.82) than the full model for 30-day ACR (0.73, 0.71-0.75). The other prediction models for 30-day PAR also had consistently better discrimination than their corresponding models for 30-day ACR. Discussion and Implications: PAR is more predictable than ACR when using tools that assess frailty, comorbidities, and ADL from administrative data. Our PAR prediction model may contribute to the accurate identification of at-risk patients in clinical settings who would benefit from transitional care interventions.

Experiences of Disabled Older Adults in Urban Area Adult Day Care Centers: A Multisite Case Study.

This study described clients' experiences within adult day care (ADC) and its related impacts. A multisite case study was conducted with 26 older adults from six ADCs in Tokyo, with interviews and field observations conducted between November 2020 and July 2022. The transcribed interviews and field notes were analyzed qualitatively. Three categories pertaining to context ("guilt and resignation to the current living conditions," "desire for social connection despite frustrating limitations," and "supported life based on weekly ADC routine") and four categories about the experiences within ADC ("savoring disability- and age-friendly conversations," "feeling happy about something new and positive," "challenges for changes in self-image," and "discomfort with others and the waste of time") were extracted. Clients' increased vulnerability due to disabilities and COVID-19 affected their experiences. ADCs provide a safe place for interaction, and their use must be encouraged to develop a disability- and age-friendly society.

Implementation and costs of housing adaptations among older adults with different functional limitations in Japan.

BACKGROUND: Accessible housing is crucial to maintain a good quality of life for older adults with functional limitations, and housing adaptations are instrumental in resolving accessibility problems. It is unclear to what extent older adults, who have a high risk of further functional decline, use housing adaptation grants acquired through the long-term care (LTC) insurance systems. This study aimed to examine the utilization of housing adaptation grants in terms of implementation and costs, for older adults with different types of functional limitations related to accessibility problems. METHODS: The study sample included individuals from a suburban city in the Tokyo metropolitan area who were certified for care support levels (indicative of the need for preventive care) for the first time between 2010 and 2018 (N = 10,372). We followed the study participants over 12 months since the care needs certification. We matched and utilized three datasets containing the same individual's data: 1) care needs certification for LTC insurance, 2) insurance premium levels, and 3) LTC insurance claims. We conducted a multivariable logistic regression analysis to estimate the likelihood of individuals with different functional limitations of having housing adaptations implemented. Afterward, we conducted a subgroup analysis of only older adults implementing housing adaptation grants to compare costs between groups with different functional limitations using the Mann-Whitney U and Kruskal-Wallis tests. RESULTS: Housing adaptations were implemented among 15.6% (n = 1,622) of the study sample, and the median cost per individual was 1,287 USD. Individuals with lower extremity impairment or poor balance were more likely to implement housing adaptations (adjusted odds ratio (AOR) = 1.290 to AOR = 2.176), while those with visual impairment or lower cognitive function were less likely to implement housing adaptations (AOR = 0.553 to AOR = 0.861). Costs were significantly lower for individuals with visual impairment (1,180 USD) compared to others (1,300 USD). CONCLUSION: Older adults with visual or cognitive limitations may not receive appropriate housing adaptations, despite their high risk of accessibility problems. Housing adaptation grants should include various types of services that meet the needs of older people with different disabilities, and the results indicate there may be a need to improve the system.

Effects of Early Postdischarge Rehabilitation Services on Care Needs-Level Deterioration in Older Adults With Functional Impairment: A Propensity Score-Matched Study.

OBJECTIVE: To examine the effects of early postdischarge rehabilitation on care needs-level deterioration in older Japanese patients. DESIGN: Propensity score-matched retrospective cohort study. SETTING: A secondary data analysis was conducted using medical and long-term care insurance claims data from a suburban city in Japan. PARTICIPANTS: We analyzed patients (N=2746) aged 65 years or older who were discharged from hospital to home between April 2012 and March 2014 and had care needs certification indicating functional impairment. INTERVENTIONS: The provision of early rehabilitation services by rehabilitation therapists within 1 month of discharge. Propensity score matching was used to control for differences in characteristics between patients with and without early rehabilitation services. MAIN OUTCOME MEASURES: Any deterioration in care needs level during the 12-month period after discharge. Cox proportional hazards analyses were conducted to identify the association between the exposure and outcome variables after matching. RESULTS: Among 2746 patients, 573 (20.9%) used early rehabilitation services. Care needs-level deterioration occurred in 508 patients (incidence: 18.3 per 1000 person-months), of which 76 used early rehabilitation services (12.3 per 1000 person-months) and 432 did not use early rehabilitation services (20.0 per 1000 person-months). One-to-one propensity score matching produced 566 matched pairs that adjusted for the differences in all covariables. In these matched pairs, the hazard of care needs-level deterioration was significantly lower among patients who used early rehabilitation services (hazard ratio=0.712, 95% CI, 0.529-0.958). A Kaplan-Meier survival analysis showed similar results (log-rank: P=.023). CONCLUSIONS: Early rehabilitation services provided by rehabilitation therapists after hospital discharge appeared effective in preventing care needs-level deterioration, and involving rehabilitation therapists in transitional care may aid the optimization of health care for older Japanese adults with functional impairment.

The revised index for social engagement (RISE) in long-term care facilities: reliability and validity in Japan.

BACKGROUND: This study aimed to establish the validity and reliability of a revised index for social engagement (RISE) in the Japanese context. METHODS: We analysed the data of 1377 participants over 65 years of age who had been admitted to two types of long-term care facilities (LTCF) in Japan: four health facilities for older adults and eight nursing homes. Resident level data based on the Japanese version of the interRAI assessment instrument were collected from 623 residents in the former and 754 in the latter. From these data, we calculated RISE by adding six dichotomous items on social engagement in the assessment form. Factorial validity was evaluated by exploratory factorial analysis and confirmatory factor analysis, convergent validity by the correlation between average activity time and the RISE score, and discriminant validity by the correlation between cognitive levels and the RISE scores. Lastly, we assessed internal consistency using Cronbach's alpha. RESULTS: We identified a two-factor model in the exploratory factorial analysis with a factor loading >0.40, except for one RISE item. The confirmatory factor analysis confirmed that the two-factor model had appropriate model fits. The correlation between time involved in activities and the RISE score was r = 0.45, while the correlation between cognitive function and the RISE score was r = -0.32. The convergent and discriminant validities supported the use of Japanese LTCF. Cronbach's alpha ranged 0.70-0.72. CONCLUSIONS: Although further revision may be needed to improve factorial validity, RISE is reliable and valid for assessing social engagement of older adults admitted to LTCF in Japan. By using the Japanese version of RISE, the positive aspects of social functioning can be appropriately assessed and provide more evidence for improving the quality of care in LTCF.

Characteristics associated with hospitalization within 30 days of geriatric intermediate care facility admission.

AIM: To identify facility-level characteristics associated with hospitalization within 30 days after admission to a geriatric intermediate care facility (GICF) (30-day hospitalization) in Japan. METHODS: This retrospective cohort study used nationwide long-term care insurance claims data and a national survey of long-term geriatric care facilities. The study population was residents admitted to GICFs between October 2016 and February 2018. The outcome variable was 30-day hospitalization. The independent variables were facility-level characteristics such as level of healthcare professionals. RESULTS: The final sample for analysis comprised 282 991 residents of mean age ± SD, 85.8 ± 7.2 years, of whom 12 814 (4.5%) experienced 30-day hospitalization. In a multivariable logistic generalized estimating equation model adjusted for facility- and resident-level characteristics, and clustering GICFs, the odds of 30-day hospitalization were 0.906 times lower (95% confidence interval [CI] 0.857-0.958) among residents in a GICF with dental hygienist than in those in a facility without. Furthermore, the risk of 30-day hospitalization was lower among residents who had been admitted to a GICF with higher staffing levels of pharmacists (adjusted odds ratio [aOR] 0.941, 95% CI 0.899-0.985), registered nurses (aOR 0.931, 95% CI 0.880-0.986), care workers (aOR 0.920, 95% CI 0.879-0.964) and speech-language pathologists (aOR 0.926, 95% CI 0.874-0.982) than in those who had been admitted to a GICF with fewer of these healthcare professionals. CONCLUSIONS: Transitional care including dental hygienist or higher staffing levels of pharmacists, registered nurses, care workers and speech-language pathologists may be a more effective way to prevent 30-day hospitalization. Geriatr Gerontol Int 2021; 21: 1010-1017.

Association of cognitive impairment severity with potentially avoidable readmissions: A retrospective cohort study of 8897 older patients.

INTRODUCTION: Understanding the association between cognitive impairment severity and potentially avoidable readmissions (PARs) in older patients may facilitate the identification of at-risk individuals who would benefit from readmission prevention measures. METHODS: This retrospective cohort study was conducted using claims data linked with routinely collected cognitive impairment assessment results from a general acute care hospital in Tokyo, Japan. Patients were 65 years or age or older who were discharged from the subject hospital to home or a facility between July 2016 and September 2018. RESULTS: A multivariable logistic regression analysis adjusted for covariates showed that the odds of PARs within 90 days to the subject hospital for patients with moderate and severe cognitive impairment were 1.418 times (95% confidence interval: 1.005-2.002) and 2.212 times (95% confidence interval: 1.206-4.058) higher, respectively, that for patients with normal cognition. DISCUSSION: Older inpatients with later-stage cognitive impairment may represent a suitable target population for transitional care programs aimed at reducing readmissions.

Association of household income with home-based rehabilitation and home help service utilization among long-term home care service users.

BACKGROUND: To examine the association of household income with home-based rehabilitation and home help services in terms of service utilization and expenditures. METHODS: A secondary data analysis of cross-sectional design was conducted using long-term care (LTC) insurance claims data, medical claims data, and three types of administrative data. The subjects comprised LTC insurance beneficiaries in Kashiwa city, Japan, who used long-term home care services in the month following care needs certification. Household income was the independent variable of interest, and beneficiaries were categorized into low-income or middle/high-income groups based on their insurance premiums. Using a two-part model, the odds ratios (ORs) and 95% confidence intervals (CIs) for the utilization of home-based rehabilitation and home help services in the month following care needs certification were estimated using logistic regression analysis, and the risk ratios (RRs) of service expenditures were estimated using a generalized linear model for gamma-distributed data with a log-link function. RESULTS: Among 3770 subjects, 681 (18.1%) used home-based rehabilitation and 1163 (30.8%) used home help services. There were 1419 (37.6%) low-income subjects, who were significantly less likely to use (OR: 0.813; 95%CI: 0.670-0.987) and spend on (RR: 0.910; 95%CI: 0.829-0.999) home-based rehabilitation services than middle/high-income subjects. Conversely, low-income subjects were significantly more likely to use (OR: 1.432; 95%CI: 1.232-1.664) but less likely to spend on (RR: 0.888; 95%CI: 0.799-0.986) home help services than middle/high-income subjects. CONCLUSION: Household income was associated with the utilization of long-term home care services. To improve access to these services, the LTC insurance system should examine ways to decrease the financial burden of low-income beneficiaries and encourage service utilization.

Association of pharmacological treatments for hypertension, diabetes, and dyslipidemia with health checkup participation and identification of disease control factors among older adults in Tokyo, Japan.

The Japanese government encourages older adults to participate in annual health checkups designed to detect lifestyle diseases such as hypertension, diabetes, and dyslipidemia. However, individuals who are already being treated for these diseases are unlikely to benefit from health checkup participation. This retrospective cohort study of older adults evaluated the associations of pharmacological treatments for these diseases with health checkup participation and identified the disease control factors among patients receiving treatments. Using medical claims data and health checkup data between September 2013 and August 2014 from 820,215 older adults aged ≥ 75 years residing in Tokyo, Japan, we examined the associations between pharmacological treatments and health checkup participation using binary logistic regression analysis. Next, patients receiving pharmacological treatments were categorized into intensive, moderate, or limited disease control based on their blood pressure, hemoglobin A1c levels, and lipid levels; multinomial logistic regression analyses were used to identify the disease control factors. The results showed that patients receiving pharmacological treatments were more likely (odds ratio: 1.374; P < 0.001) to participate in health checkups than patients not receiving treatments. Patients with intensive disease control were more likely to be aged ≥ 90 years and use home medical care than patients with moderate control. Our findings suggest that it may be beneficial to shift the focus of health checkups from simply identifying at-risk patients to also supporting disease management. Information obtained from databases that link medical claims and health checkup data may improve evaluations of disease control in older adults and help to streamline healthcare systems.

Associations of Hospital Discharge Services With Potentially Avoidable Readmissions Within 30 Days Among Older Adults After Rehabilitation in Acute Care Hospitals in Tokyo, Japan.

OBJECTIVE: To examine the associations of 3 major hospital discharge services covered under health insurance (discharge planning, rehabilitation discharge instruction, and coordination with community care) with potentially avoidable readmissions (PARs) within 30 days in older adults after rehabilitation in acute care hospitals in Tokyo, Japan. DESIGN: Retrospective cohort study using a large-scale medical claims database of all Tokyo residents aged ≥75 years. SETTING: Acute care hospitals. PARTICIPANTS: Patients who underwent rehabilitation and were discharged to home (N=31,247; mean age in years ± SD, 84.1±5.7) between October 2013 and July 2014. INTERVENTIONS: None. MAIN OUTCOME MEASURE: 30-day PAR. RESULTS: Among the patients, 883 (2.9%) experienced 30-day PAR. A multivariable logistic generalized estimating equation model (with a logit link function and binominal sampling distribution) that adjusted for patient characteristics and clustering within hospitals showed that the discharge services were not significantly associated with 30-day PAR. The odds ratios were 0.962 (95% confidence interval [CI], 0.805-1.151) for discharge planning, 1.060 (95% CI, 0.916-1.227) for rehabilitation discharge instruction, and 1.118 (95% CI, 0.817-1.529) for coordination with community care. In contrast, the odds of 30-day PAR among patients with home medical care services were 1.431 times higher than those of patients without these services (P<.001), and the odds of 30-day PAR among patients with a higher number (median or higher) of rehabilitation units were 2.031 times higher than those of patients with a lower number (below median) (P<.001). Also, the odds of 30-day PAR among patients with a higher Hospital Frailty Risk Score (median or higher) were 1.252 times higher than those of patients with a lower score (below median) (P=.001). CONCLUSIONS: The insurance-covered discharge services were not associated with 30-day PAR, and the development of comprehensive transitional care programs through the integration of existing discharge services may help to reduce such readmissions.

Home safety practices to prevent child injury and its association with family and children's daily routines in Japan: A cross-sectional study.

AIM: To investigate the association between children and their families' daily life routines and the implementation of safety practices in their homes. METHODS: A cross-sectional study was conducted using a self-administered questionnaire among parents of 3-year-old children, who visited a public health center in Tokyo for their health checkups. Associations between the implementation of safety practices and family and children's basic daily routines were assessed using a multivariate logistic regression. RESULTS: Data from 336 parents were analyzed. Three items were found to be significantly related to the non-implementation of safety practices, such as "television-watching behavior: after 8:00 p.m." (adjusted odds ratio = 1.88, p = .02), "washing hands: not every time after getting home" (adjusted odds ratio = 2.24, p = .02), and "Family Routines Inventory: lower score" (a measurement of the routinization of a family's daily life; adjusted odds ratio = .83, p = .01). CONCLUSION: The cumulative results suggest that the lack of safety practices implementation signify nonadherence to daily routine practices by parents.

Environmental Challenges in the Home for Ageing Societies: a Comparison of Sweden and Japan.

Sweden and Japan are developed welfare countries facing serious societal and public health challenges due to demographic ageing. The objective of the present study was to provide a background to environmental challenges in the home, related to demographic ageing. Specific aims were to compare: 1) demography and household composition 2) physical housing stocks 3) indoor accidents and 4) housing adaptations between the two countries. Descriptive analyses were conducted using secondary data sources. Demographic ageing is projected to accelerate faster in Japan compared to Sweden, with overall lower fertility rates expected in Japan. In 2050, 39% of the Japanese population is projected to be aged 65 years or older, compared to 23% of the Swedish population. The Swedish ordinary housing stock was markedly older than the Japanese housing stock, with almost 80% of the dwellings built before 1980, while in Japan about 65% were built after 1980. High occurrences of fatal indoor accidents were noted in both countries, but for different reasons. In Sweden, falls was the dominant cause of fatal accidents among older people, while in Japan, in addition to falls, drowning and suffocation caused most of the fatal accidents. Housing adaptations were less frequent in Japan compared to Sweden, and the procedure for evaluating, granting and carrying out housing adaptations appeared to be more complicated in Japan. To decrease the occurrence of indoor accidents, identifying and removing "risk barriers" could be instrumental. In both countries, large-scale efforts are imperative to improve the housing situation for the ageing population.

[The associations between readmission within 30 days and the medical institute factors among older patients receiving home medical care].

AIM: To improve preventive strategies for readmission within 30 days after discharge among older patients receiving home medical care services, we examined the associations between readmission within 30 days and the medical institute factors among patients over 75 years of age. METHODS: All patients over 75 years of age receiving home medical care services and who had been admitted to hospital or clinic and discharged between September 2013 and July 2014 in Tokyo, Japan, were participants of this study (n=7,213). The primary outcome was readmission within 30 days after discharge. We performed generalized estimating equations (GEEs) using a model with logit link and binominal sampling distribution to examine the associations of sociodemographic variables, the prevalence of chronic diseases and medical institute factors with readmission within 30 days. RESULTS: Approximately 11.2% of the patients receiving home medical care services who had been discharged were readmitted within 30 days after discharge. Men, cancer patients, and emergency admission were positively associated with readmission within 30 days according to the GEEs. The rate of readmission within 30 days was lower in patients receiving home medical care services at home care support clinics/hospitals after discharge (adjusted odds ratio [aOR] = 0.205, p value < 0.001) and in patients discharged from hospitals with over 200 beds (aOR = 0.447, p value < 0.001, vs. clinics) than in others. CONCLUSION: Home care support clinics/hospitals, which can provide home medical care services around the clock, may help reduce the rate of readmission within 30 days.