A multistate transition model of changes in loneliness and carer stress among community-dwelling older adults in Aotearoa New Zealand.

OBJECTIVES: To identify changes in loneliness and carer stress between two time points for older people of different ethnicities who had repeated interRAI home care assessments. METHODS: Participants consisted of community-dwelling older adults across New Zealand who received two interRAI-HC assessments between 5 July 2012 and 31 December 2019. Two multistate models were developed: the first model was not lonely versus lonely, and the second model was no carer stress versus carer stress. The one-year transition probabilities were calculated. Mean sojourn times were calculated for each state except death. Paired t-tests assessed the differences in transition probabilities between the different ethnic groups. RESULTS: The mean age of the cohort was 82.5 years (SD 7.7 years). At first assessment, 14,646 (21%) older people stated they were lonely and 26,789 carers (38%) experienced stress. The most common first transition type was not lonely to not lonely: Maori 42%, Pacific 54%, Asian, 48% and Other 40%. The highest one-year transition probability in the loneliness model was living in aged residential care to death (0.79). The most common first transition type for the carer stress was no carer stress to no carer stress: Maori 35%, Pacific, 46%, Asian, 43% and Other 33%. The highest one-year transition probability in the carer stress model was living in aged residential care to death (0.80). The statuses not lonely and no carer stress had a mean sojourn time of approximately one year, and eight months to one year, respectively. CONCLUSIONS: Loneliness can change over time due to circumstances and an individual's perception of loneliness at the time of assessment. Carer stress is enduring and has a low probability of improvement.

Exploring older care recipients' sleep status as a predictor for informal carer distress: evidence from New Zealand's interRAI home care assessment data.

OBJECTIVES: Understanding factors affecting informal carers' well-being is important to support healthy ageing at home. Sleep disturbances of care recipients are increasingly recognised as affecting the well-being of both parties. This research assesses the relationship between indicators of care recipients' sleep status and carer distress, as well as carer distress with subsequent admission to residential aged care, using prospectively collected Home Care International Residential Assessment Instrument (interRAI-HC) assessment data. PARTICIPANTS: Data were sourced from 127 832 assessments conducted between 2012 and 2019 for people aged 55 years or older who had support from at least one informal carer. The majority (59.4%) of care recipients were female and 59.1% were defined as having cognitive impairment or dementia (CIoD). SETTING: New Zealand. DESIGN: Logistic regression modelling was used to assess the independent relationships between indicators of care recipients' sleep status (difficulty sleeping and fatigue) and primary caregivers' distress (feeling overwhelmed or distressed). Kaplan meier curves illustrated the subsequent relationship between caregiver distress and care recipients' transitions to aged residential care. RESULTS: Care recipients' sleeping difficulty (32.4%) and moderate-severe fatigue (46.6%) were independently associated with caregiver distress after controlling for key demographic and health factors included in the assessment. Distress was reported by 39.9% of informal caregivers and was three times more likely among those supporting someone with a CIoD. Caregiver distress was significantly associated with care recipients' earlier admission into aged residential care. CONCLUSIONS: Indicators of sleep disturbance among care recipients are associated with increased likelihood of carer distress. This has implications for managing the overall home-care situation and long-term care needs, as well as the well-being of both parties. Findings will inform research and development of measures, services and interventions to improve the sleep and waking health of older people, including those with CIoD and family caregivers.

Utility of Big Data to Explore Medication Adherence in Maori and Non-Maori Community-Dwelling Older Adults with Heart Failure in Aotearoa New Zealand: A Cross-sectional Study.

BACKGROUND: Medication adherence improves morbidity and mortality-related outcomes in heart failure, and knowledge of patterns of medication adherence supports patient and clinician decision-making. Routinely collected national data facilitate the exploration of medication adherence and associated factors in older adults with heart failure, including the association between ethnicity and adherence. There are known inequities in access to medicines between Maori (Indigenous People of Aotearoa New Zealand) and non-Maori, yet ethnic variation in medicines adherence in community-dwelling older adults with heart failure has not been explored. OBJECTIVE: Here we identify medication adherence rates for community-dwelling older adults diagnosed with heart failure and differences in adherence rates between Maori and non-Maori. METHODS: Cross-sectional analysis of interRAI (comprehensive standardised assessment) data in a continuously recruited national cohort from 2012 to 2019. RESULTS: Overall, 13,743 assessments (Maori N = 1526) for older community-dwelling adults with heart failure diagnoses were included. The mean age of participants was 74.5 years [standard deviation (SD) 9.1 years] for Maori and 82.3 years (SD 7.8 years) non-Maori. In the Maori cohort, 21.8% did not adhere fully to their medication regimen, whereas in the non-Maori cohort, this figure was 12.8%. After adjusting for confounders, the Maori cohort were more likely to be medication non-adherent than non-Maori [prevalence ratio 1.53, 95% confidence interval (CI) 1.36-1.73]. CONCLUSIONS: There was a significant disparity between Maori and non-Maori concerning medication adherence. Given the international use of the interRAI-HC assessment tool, these results have significant transferability to other countries and allow the identification of underserved ethnic groups for which culturally appropriate interventions can be targeted.

Chronic health conditions and mortality among older adults with complex care needs in Aotearoa New Zealand.

BACKGROUND: Older people have more comorbidities than younger groups and multimorbidity will increase. Often chronic conditions affect quality of life, functional ability and social participation. Our study aim was to quantify the prevalence of chronic conditions over a three-year period and their association with mortality after accounting for demographics. METHODS: We conducted a retrospective cohort study using routinely collected health data including community-dwelling older adults in New Zealand who had an interRAI Home Care assessment between 1 January 2017 and 31 December 2017. Descriptive statistics and differences between variables of interest among ethnic groups were reported. Cumulative density plots of mortality were developed. Logistic regression models adjusted for age and sex to estimate mortality were created independently for each combination of ethnicity and disease diagnosis. RESULTS: The study cohort consisted of 31,704 people with a mean (SD) age of 82.3 years (8.0), and of whom 18,997 (59.9%) were female. Participants were followed for a median 1.1 (range 0 to 3) years. By the end of the follow-up period 15,678 (49.5%) people had died. Nearly 62% of Maori and Pacific older adults and 57% of other ethnicities had cognitive impairment. Diabetes the next most prevalent amongst Maori and Pacific peoples, and coronary heart disease amongst Non-Maori/Non-Pacific individuals. Of the 5,184 (16.3%) who had congestive heart failure (CHF), 3,450 (66.6%) died. This was the highest mortality rate of any of the diseases. There was a decrease in mortality rate with age for both sexes and all ethnicities for those with cancer. CONCLUSIONS: Cognitive impairment was the most common condition in community dwelling older adults who had an interRAI assessment. Cardiovascular disease (CVD) has the highest mortality risk for all ethnic groups, and in non-Maori/non-Pacific group of advanced age, risk of mortality with cognitive impairment is as high as CVD risk. We observed an inverse for cancer mortality risk with age. Important differences between ethnic groups are reported.

Deprescribing Anticholinergic and Sedative Drugs to Reduce Polypharmacy in Frail Older Adults Living in the Community: A Randomized Controlled Trial.

BACKGROUND: Polypharmacy is associated with poor outcomes in older adults. Targeted deprescribing of anticholinergic and sedative medications may improve health outcomes for frail older adults. Our pharmacist-led deprescribing intervention was a pragmatic 2-arm randomized controlled trial stratified by frailty. We compared usual care (control) with the intervention of pharmacists providing deprescribing recommendations to general practitioners. METHODS: Community-based older adults (≥65 years) from 2 New Zealand district health boards were recruited following a standardized interRAI needs assessment. The Drug Burden Index (DBI) was used to quantify the use of sedative and anticholinergic medications for each participant. The trial was stratified into low, medium, and high-frailty. We hypothesized that the intervention would increase the proportion of participants with a reduction in DBI ≥ 0.5 within 6 months. RESULTS: Of 363 participants, 21 (12.7%) in the control group and 21 (12.2%) in the intervention group had a reduction in DBI ≥ 0.5. The difference in the proportion of -0.4% (95% confidence interval [CI]: -7.9% to 7.0%) provided no evidence of efficacy for the intervention. Similarly, there was no evidence to suggest the effectiveness of this intervention for participants of any frailty level. CONCLUSION: Our pharmacist-led medication review of frail older participants did not reduce the anticholinergic/sedative load within 6 months. Coronavirus disease 2019 (COVID-19) lockdown measures required modification of the intervention. Subgroup analyses pre- and post-lockdown showed no impact on outcomes. Reviewing this and other deprescribing trials through the lens of implementation science may aid an understanding of the contextual determinants preventing or enabling successful deprescribing implementation strategies.

Carer distress among community living older adults with complex needs in the pre- and post-COVID-19 era: a national population study.

Carer distress is one important negative impact of caregiving and likely exacerbated by the novel coronavirus disease 2019 (COVID-19) pandemic, yet little population-based epidemiological information exists. Using national data from repeated standardized comprehensive geriatric needs assessments, this study aims to: describe the pattern of caregiver distress among those providing informal care to community-living adults aged ≥ 65 years with complex needs in New Zealand over time; estimate the COVID-19 effect on this temporal pattern; and, investigate relationships between participants' sociodemographic and selected health measures on caregiver distress. Fractional polynomial regression and multivariable multilevel mixed-effects models were employed. Overall, 231,277 assessments from 144,358 participants were analysed. At first assessment, average age was 82.0 years (range 65-107 years), and 85,676 (59.4%) were female. Carer distress prevalence increased from 35.1% on 5 July 2012 to a peak of 48.5% on 21 March 2020, when the New Zealand Government announced a national lock-down. However, the population attributional fraction associated with the COVID-19 period was small, estimated at 0.56% (95% CI 0.35%, 0.77%). Carer distress is common and has rapidly increased in recent years. While significant, the COVID-19 impact has been relatively small. Policies and services providing efficacious on-going strategies to support caregivers deserves specific attention.

Development and validation of a frailty index compatible with three interRAI assessment instruments.

BACKGROUND: a Frailty Index (FI) calculated by the accumulation of deficits is often used to quantify the extent of frailty in individuals in specific settings. This study aimed to derive a FI that can be applied across three standardised international Residential Assessment Instrument assessments (interRAI), used at different stages of ageing and the corresponding increase in support needs. METHODS: deficit items common to the interRAI Contact Assessment (CA), Home Care (HC) or Long-Term Care Facilities assessment (LTCF) were identified and recoded to form a cumulative deficit FI. The index was validated using a large dataset of needs assessments of older people in New Zealand against mortality prediction using Kaplan Meier curves and logistic regression models. The index was further validated by comparing its performance with a previously validated index in the HC cohort. RESULTS: the index comprised 15 questions across seven domains. The assessment cohort and their mean frailty (SD) were: 89,506 CA with 0.26 (0.15), 151,270 HC with 0.36 (0.15) and 83,473 LTCF with 0.41 (0.17). The index predicted 1-year mortality for each of the CA, HC and LTCF, cohorts with area under the receiver operating characteristic curves (AUCs) of 0.741 (95% confidence interval, CI: 0.718-0.762), 0.687 (95%CI: 0.684-0.690) and 0.674 (95%CI: 0.670-0.678), respectively. CONCLUSIONS: the results for this multi-instrument FI are congruent with the differences in frailty expected for people in the target settings for these instruments and appropriately associated with mortality at each stage of the journey of progressive ageing.

Optimising function and well-being in older adults: protocol for an integrated research programme in Aotearoa/New Zealand.

BACKGROUND: Maintaining independence is of key importance to older people. Ways to enable health strategies, strengthen and support whanau (family) at the community level are needed. The Ageing Well through Eating, Sleeping, Socialising and Mobility (AWESSOM) programme in Aotearoa/New Zealand (NZ) delivers five integrated studies across different ethnicities and ages to optimise well-being and to reverse the trajectory of functional decline and dependence associated with ageing. METHODS: Well-being, independence and the trajectory of dependence are constructs viewed differently according to ethnicity, age, and socio-cultural circumstance. For each AWESSoM study these constructs are defined and guide study development through collaboration with a wide range of stakeholders, and with reference to current evidence. The Compression of Functional Decline model (CFD) underpins aspects of the programme. Interventions vary to optimise engagement and include a co-developed whanau (family) centred initiative (Nga Pou o Rongo), the use of a novel LifeCurve™App to support behavioural change, development of health and social initiatives to support Pacific elders, and the use of a comprehensive oral health and cognitive stimulation programme for cohorts in aged residential care. Running parallel to these interventions is analysis of large data sets from primary care providers and national health databases to understand complex multi-morbidities and identify those at risk of adverse outcomes. Themes or target areas of sleep, physical activity, oral health, and social connectedness complement social capital and community integration in a balanced programme involving older people across the ability spectrum. DISCUSSION: AWESSoM delivers a programme of bespoke yet integrated studies. Outcomes and process analysis from this research will inform about novel approaches to implement relevant, socio-cultural interventions to optimise well-being and health, and to reverse the trajectory of decline experienced with age. TRIAL REGISTRATION: The At-risk cohort study was registered by the Australian New Zealand Clinical Trials registry on 08/12/2021 (Registration number ACTRN 12621001679875 ).

Factors associated with caregiver distress among home care clients in New Zealand: Evidence based on data from interRAI Home Care assessment.

OBJECTIVE: To identify factors associated with caregiver distress among home care clients in New Zealand. METHODS: The cohort consisted of 105,978 community-dwelling people aged 65 years or older requiring home care services in New Zealand who had at least one informal caregiver. Bivariate and multivariable logistic regression analyses were used to identify factors associated with caregiver distress. RESULTS: Variables associated with risk of caregiver distress included Depression Rating Scale score, aggressive behaviour symptoms, primary informal caregiver relationship to patient, Cognitive Performance Scale score, Changes in Health, End-stage disease, and Signs and Symptoms Scale score, informal care time, secondary informal caregiver relationship to care recipient, activities of daily living hierarchy scale score and any hospitalisation. CONCLUSIONS: The study has identified important characteristics that are associated with caregiver stress. These results suggest that caregiver distress can be relieved by promoting protective factors and aiming to reduce risk factors among home care clients in New Zealand.

Risk factors for injuries in New Zealand older adults with complex needs: a national population retrospective study.

BACKGROUND: Falls and falls-related injuries are common among older adults. Injuries in older adults lead to poor outcomes and lower quality of life. The objective of our study was to identify factors associated with fall-related injuries among home care clients in New Zealand. METHODS: The study cohort consisted of 75,484 community-dwelling people aged 65 years or older who underwent an interRAI home care assessment between June 2012 and June 2018 in New Zealand. The injuries included for analysis were fracture of the distal radius, hip fracture, pelvic fracture, proximal humerus fracture, subarachnoid haemorrhage, traumatic subdural haematoma, and vertebral fracture. Unadjusted and adjusted competing risk regression models were used to identify factors associated with fall-related injuries. RESULTS: A total of 7414 (9.8%) people sustained a falls-related injury over the 6-year period, and most injuries sustained were hip fractures (4735 63.9%). The rate of injurious falls was 47 per 1000 person-years. The factors associated with injury were female sex, older age, living alone, Parkinson's disease, stroke/CVA, falls, unsteady gait, tobacco use, and being underweight. Cancer, dyspnoea, high BMI, and a decrease in the amount of food or fluid usually consumed, were associated with a reduced risk of sustaining an injury. After censoring hip fractures the risks associated with other types of injury were sex, age, previous falls, dyspnoea, tobacco use, and BMI. CONCLUSIONS: While it is important to reduce the risk of falls, it is especially important to reduce the risk of falls-related injuries. Knowledge of risk factors associated with these types of injuries can help to develop focused intervention programmes and development of a predictive model to identify those who would benefit from intervention programmes.

Frailty of Maori, Pasifika, and Non-Maori/Non-Pasifika Older People in New Zealand: A National Population Study of Older People Referred for Home Care Services.

BACKGROUND: Little is known about the prevalence of frailty in indigenous populations. We developed a frailty index (FI) for older New Zealand Maori and Pasifika who require publicly funded support services. METHODS: An FI was developed for New Zealand adults aged 65 and older who had an interRAI Home Care assessment between June 1, 2012 and October 30, 2015. A frailty score for each participant was calculated by summing the number of deficits recorded and dividing by the total number of possible deficits. This created a FI with a potential range from 0 to 1. Linear regression models for FIs with ethnicity were adjusted for age and sex. Cox proportional hazards models were used to assess the association between the FI and mortality for Maori, Pasifika, and non-Maori/non-Pasifika. RESULTS: Of 54 345 participants, 3096 (5.7%) identified as Maori, 1846 (3.4%) were Pasifika, and 49 415 (86.7%) identified as neither Maori nor Pasifika. New Zealand Europeans (48 178, 97.5%) constituted most of the latter group. Within each sex, the mean FIs for Maori and Pasifika were greater than the mean FIs for non-Maori and non-Pasifika, with the difference being more pronounced in women. The FI was associated with mortality (Maori subhazard ratio [SHR] 2.53, 95% CI 1.63-3.95; Pasifika SHR 6.03, 95% CI 3.06-11.90; non-Maori and non-Pasifika SHR 2.86, 95% CI 2.53-3.25). CONCLUSIONS: This study demonstrated differences in FI between the ethnicities in this select cohort. After adjustment for age and sex, increases in FI were associated with increased mortality. This suggests that FI is predictive of poor outcomes in these ethnic groups.

Effect of Capacity to Undertake Instrumental Activities of Daily Living on Entry to Aged Residential Care in Older People With Heart Failure.

Background: Heart failure is a common condition in older people with complex medical needs. A key factor in resilience after heart failure is the capacity to perform the instrumental activities of daily living (IADLs). Knowing the association between capacity to perform IADLs and entry into aged residential care will help health professionals plan interventions that will allow older people to remain independent longer. Methods: We analyzed the association between the capacity to perform eight IADLs and entry into ARC. Participants included New Zealanders aged ≥65 years with a diagnosis of heart failure, and who had an InterRAI 9.1 Home Care assessment between July 2012 and June 2018. A multivariable competing risks regression model for entry to ARC with death as the competing risks was used to establish sub-hazard ratios (SHR) for IADL capacity. Co-variates included demographic variables, co-morbidities, living arrangements, cognitive performance, depression, timed walk, alcohol use, smoking, activities of daily living, recent hospitalization and history of falls. Results: There were 13,220 participants with heart failure who were followed for a median 1.69 (0.70-3.17) years. There were 3,177 (24.0%) participants who entered aged residential care and 5,714 (43.2%) who died without having first entered residential care. Overall capacity to perform specific IADLs was "very poor" for housework (85.5%), shopping (68.0%), stairs (61.7%), meal preparation (53.0%), and transportation (52.2%). In the multivariable model, compared to adequate capacity (the reference) poorer capacity for managing finance, managing medications, meal preparation and transport were all associated with increased risk of entering aged residential care, with SHR from 1.05 to 1.18. Overall, the IADL capacity explained ~10% of the risk of entering aged residential care. Conclusion: Capacity to perform IADL is a key factor in maintaining resilience in older people with heart failure. Capacity to manage finances, transport and medications, prepare meals, and transport oneself with minimal supervision could reduce the risk of entry into aged residential care. Developing early interventions and support for people with poor capacity to perform their IADL may help reduce admission into aged residential care.

Predictors of Residential Care Admission in Community-Dwelling Older People With Dementia.

OBJECTIVES: The objectives of this study were to identify variables associated with dementia and entry into aged residential care (ARC) and derive and validate a risk prediction model for dementia and entry into ARC. DESIGN: This was an observational study of prospectively collected Home Care International Residential Assessment Instrument (interRAI-HC) assessment data. SETTING AND PARTICIPANTS: Participants included all people age ≥65 years who had completed an interRAI-HC assessment between July 1, 2012 and June 30, 2018. Exclusion criteria included death or entry into ARC within 30 days of assessment and not living at home at the time of the assessment. MEASURES: InterRAI data from 94,202 older New Zealanders were evaluated for presence or absence of dementia. A multivariable competing-risks model for entry into ARC with death as the competing event was used to estimate subdistribution hazard ratios (SHR). RESULTS: In total, there were 18,672 (19.8%) persons with dementia (PWD). PWD were almost twice as likely to enter ARC as persons without dementia [42.8% vs 25.3%; difference 17.5% (95% confidence interval 16.7%‒18.2%)]. PWD at highest risk of entering ARC were those where there was a desire to live elsewhere (SHR 1.44), depression (indicated, SHR 1.15), poor cognitive performance (Cognitive Performance Scale minimal SHR 1.32 and severe plus SHR 1.91), and wandering (SHR 1.19). Factors associated with reduced risks of PWD entering ARC were living with a child or relative, alcohol consumption, and comorbidities. CONCLUSIONS AND IMPLICATIONS: A desire to live elsewhere, social isolation, independent activities of daily living, and depression were independently associated with entry into ARC. Supporting caregivers may improve outcomes for PWD that delay entry into ARC. Future revisions of the interRAI questionnaire could provide more insight on this matter.

Development and validation of multivariable mortality risk-prediction models in older people undergoing an interRAI home-care assessment (RiskOP).

BACKGROUND: Currently, one-year survival of older people with complex co-morbidities is unpredictable. Identifying older adults with a reduced life expectancy will lead to more targeted care and better healthcare resource allocation. METHODS: Development and validation of one-year and three-month mortality risks in people aged ≥65 years who had completed an International Resident Assessment Instrument-Home Care (interRAI-HC) assessment between July 2012 and March 2018. Data was split into development (90%) and validation data sets (10%). A multivariable logistic regression model using data from 108 interRAI questions across multiple domains was developed and validated using discrimination metrics and calibration curves. Variables each explaining at least 1% of the model were then used to develop and validate a parsimonious model. Subgroups by sex, age, ethnicity, and comorbidities were evaluated. FINDINGS: There were 104,436 persons (60.2% female; mean age 82.1 years) in the study cohort of whom 20,972 (20.1%) died within one year. The full multivariable model had area under the curves (AUCs) of 0.778 to 0.795 in the 5 validation datasets and was well calibrated. After variable reduction a parsimonious model consisted of 16 variables and was well calibrated and the AUC remained high: 0.773 (0.769 to 0.777). The three-month parsimonious model comprised 22 variables and was well calibrated with an AUC of 0.843 (95%CI: 0.839 to 0.848). INTERPRETATION: These community-based risk prediction models accurately predict mortality in older people with complex co-morbidities. They may contribute to both forecasting for policy making and clinical decision making regarding an individual's needs. FUNDING: The New Zealand Health Research Council.

Evaluating the Influence of Social Factors on Aged Residential Care Admission in a National Home Care Assessment Database of Older Adults.

OBJECTIVES: Evaluate the influence of social factors on admission to aged residential care (ARC) facilities using a national comprehensive geriatric assessment database in New Zealand. DESIGN: Time-to-event analysis of a continuously recruited national cohort. PARTICIPANTS AND SETTING: An anonymized data extract from a large national database for home care assessments (June 2012-December 2015) was matched with data on mortality and admissions into ARC. METHODS: Four key components of psychosocial risk in relation to ARC admission were used for analysis: living alone, negative social interactions, perceived loneliness, and carer stress. Exploratory data analysis was conducted for each of the variables of interest and demographics. Unadjusted and adjusted competing risk regressions were then performed with admission into ARC being the primary outcome, death the competing risk, and remaining at home the survival case. RESULTS: After data cleaning, matching, and applying exclusions, the study population consisted of 54,345 eligible participants. Mean age of participants was 81.9 years (standard deviation 7.4), 62.1% were female, and 88.7% identified as European ethnicity. In the adjusted model, all 4 social factors remained significantly associated with ARC admission, namely: living alone [subhazard ratio (SHR) = 1.43 95% confidence interval (CI) 1.37-1.50]; negative social interactions (SHR = 1.22, 95% CI 1.15-1.30); perceived loneliness (SHR = 1.18, 95% CI 1.13-1.24); and carer stress (SHR = 1.28, 95% CI 1.23-1.34). CONCLUSIONS AND IMPLICATIONS: Interventions targeted at social factors in the context of delaying ARC admission merit further development and evaluation.

Risk factors for hip fracture in New Zealand older adults seeking home care services: a national population cross-sectional study.

BACKGROUND: Hip fractures are a common injury in older people. Many studies worldwide have identified various risk factors for hip fracture. However, risk factors for hip fracture have not been studied extensively in New Zealand. The interRAI home care assessment consists of 236 health questions and some of these may be related to hip fracture risk. METHODS: The cohort consisted of 45,046 home care clients aged 65 years and older, in New Zealand. Assessments ranged from September 2012 to October 2015. Hip fracture diagnosis was identified by linking ICD (International Classification of Diseases) codes from hospital admissions data (September 2012 to December 2015) to the interRAI home care data. Unadjusted and adjusted competing risk regressions, using the Fine and Gray method were used to identify risk factors for hip fracture. Mortality was the competing event. RESULTS: The cohort consisted of 61% female with a mean age of 82.7 years. A total of 3010 (6.7%) of the cohort sustained a hip fracture after assessment. After adjusting for sociodemographic and potentially confounding variables falls (SHR (Subhazard Ratio) = 1.17, 95% CI (Confidence interval): 1.05-1.31), previous hip fracture (SHR = 4.16, 95% CI: 2.93-5.89), female gender (SHR = 1.38, 95% CI: 1.22-1.55), underweight (SHR = 1.67, 95% CI = 1.39-2.02), tobacco use (SHR = 1.56, 95% CI = 1.25-1.96), Parkinson's disease (SHR = 1.45, 95% CI: 1.14-1.84), and Wandering (SHR = 1.36, 95% CI: 1.07-1.72) were identified as risk factors for hip fracture. Shortness of breath (SHR = 0.80, 95% CI: 0.71-0.90), was identified as being protective against hip fracture risk. Males and females had different significant risk factors. CONCLUSIONS: Risk factors for hip fracture similar to international work on risk factors for hip fracture, can be identified using the New Zealand version of the interRAI home care assessment.

Drug Burden Index and Its Association With Hip Fracture Among Older Adults: A National Population-Based Study.

BACKGROUND: The Drug Burden Index (DBI) calculates the total sedative and anticholinergic load of prescribed medications and is associated with functional decline and hip fractures in older adults. However, it is unknown if confounding factors influence the relationship between the DBI and hip fractures. The objective of this study was to evaluate the association between the DBI and hip fractures, after correcting for mortality and multiple potential confounding factors. METHODS: A competing-risks regression analysis conducted on a prospectively recruited New Zealand community-dwelling older population who had a standardized (International Resident Assessment Instrument) assessment between September 1, 2012, and October 31, 2015, the study's end date. Outcome measures were survival status and hip fracture, with time-varying DBI exposure derived from 90-day time intervals. The multivariable competing-risks regression model was adjusted for a large number of medical comorbidities and activities of daily living. RESULTS: Among 70,553 adults assessed, 2,249 (3.2%) experienced at least one hip fracture, 20,194 (28.6%) died without experiencing a fracture, and 48,110 (68.2%) survived without a fracture. The mean follow-up time was 14.9 months (range: 1 day, 37.9 months). The overall DBI distribution was highly skewed, with median time-varying DBI exposure ranging from 0.93 (Q1 = 0.0, Q3 = 1.84) to 0.96 (Q1 = 0.0, Q3 = 1.90). DBI was significantly related to fracture incidence in unadjusted (p < .001) and adjusted (p < .001) analyses. The estimated subhazard ratio was 1.52 (95% confidence interval: 1.28-1.81) for those with DBI > 3 compared with those with DBI = 0 in the adjusted analysis. CONCLUSIONS: In this study, increasing DBI was associated with a higher likelihood of fractures after accounting for the competing risk of mortality and adjusting for confounders. The results of this unique study are important in validating the DBI as a guide for medication management and it could help reduce the risk of hip fractures in older adults.

A frailty index derived from a standardized comprehensive geriatric assessment predicts mortality and aged residential care admission.

BACKGROUND: Frailty in older adults is a condition characterised by a loss or reduction in physiological reserve resulting in increased clinical vulnerability. However, evidence suggests that frailty may be modifiable, and identifying frail older people could help better target specific health care interventions and services. METHODS: This was a regional longitudinal study to develop a frailty index for older adults living in Canterbury New Zealand. Participants included 5586 community dwelling older people that had an interRAI Minimum Data Set (MDS-HC) Home Care assessment completed between 2008 and 2012. The outcome measures were mortality and entry into aged residential care (ARC), after five years. RESULTS: Participants were aged between 65 and 101 (mean age was 82 years). The five-year mortality rate, including those who entered ARC, for this cohort was 67.1% (n = 3747). The relationship between the frailty index and both mortality and entry into ARC was significant (P < 0.001). At five years, 25.1% (n = 98) of people with a baseline frailty of < 0.1 had died compared with 28.2% (n = 22) of those with a frailty index of ≥0.5 (FS 5). Furthermore, 43.7% (n = 171) of people with a frailty index of < 0.1 were still living at home compared to 2.6% (n = 2) of those with a frailty index of ≥0.5. CONCLUSION: A frailty index was created that predicts mortality, and admission into ARC. This index could help healthcare professionals and clinicians identify older people at risk of health decline and mortality, so that appropriate services and interventions may be put in place.

Profile of ethnicity, living arrangements and loneliness amongst older adults in Aotearoa New Zealand: A national cross-sectional study.

OBJECTIVE: To explore the patterns of living arrangements, ethnicity and loneliness amongst older adults (aged 65+ years) living at home. METHODS: National interRAI-HC (International Residential Assessment Instrument-Home Care) assessments conducted between 1 September 2012 and 31 January 2016 were analysed. Analysis focused on the associations between loneliness and both ethnic groups and living arrangements. RESULTS: There were 71 859 eligible participants, with average age 82.7 years, comprising Maori (5%), Pasifika (3%), Asian (2%) and European/Other (89%) ethnic identification. Most stated that they were not lonely (79%), but those living alone were more likely to be lonely (29%) than those living with others (14%) (P < 0.05). Amongst those living alone, significant differences in the likelihood of being lonely emerged between ethnic groups (P < 0.05). CONCLUSIONS: Ethnic identification and living arrangements were significantly associated with the likelihood of loneliness for those having an interRAI-HC assessment. Efforts to reduce the negative impacts of loneliness need a nuanced approach.

Drug Burden and its Association with Falls Among Older Adults in New Zealand: A National Population Cross-Sectional Study.

BACKGROUND: Adverse outcomes associated with advanced diseases are often exacerbated by polypharmacy. OBJECTIVES: The current study investigated an association between exposure to anticholinergic and sedative medicines and falls in community-dwelling older people, after controlling for potential confounders. METHODS: We conducted a retrospective cross-sectional study of a continuously recruited national cohort of community-dwelling New Zealanders aged 65 years and over. Participants had an International Resident Assessment Instrument-Home Care (interRAI-HC) assessment between 1 September 2012 and 31 January 2016. InterRAI-HC is a comprehensive, multi-domain, standardised assessment. This study captured 18 variables, including fall frequency, from the interRAI. These data were deterministically matched with the Drug Burden Index (DBI) for each participant, derived from an anonymised national dispensed pharmaceuticals database. DBI groupings were statistically ascertained, and ordinal regression models employed. RESULTS: Overall, there were 71,856 participants, with a mean age of 82.7 years (range 65-106); 43,802 (61.0%) were female, and 63,578 (88.5%) were New Zealand European. In unadjusted and adjusted analyses, DBI groupings were related to falls (p < 0.001). A DBI score > 3 was associated with a 41% increase in falls compared with a DBI score of 0 (p < 0.001). There was a 'dose-response' relationship between DBI levels and falls risk. CONCLUSIONS: DBI was found to be independently and positively associated with a greater risk of falls in this cohort after adjustment for 18 known confounders. We suggest that the DBI could be a valuable tool for clinicians to use alongside electronic prescribing to help reduce falls in older people.