Changes in hospitalisation rates in older people before and after moving to a retirement village.

OBJECTIVES: An increasing proportion of older people live in Retirement Villages ('villages'). This population cites support for health-care issues as one reason for relocation to villages. Here, we examine whether relocation to villages is associated with a decline in hospitalisations. METHODS: Retrospective, before-and-after observational study. SETTING: Retirement villages, Auckland, New Zealand. PARTICIPANTS: 466 cognitively intact village residents (336 [72%] female); mean (SD) age at moving to village was 73.9 (7.7) years. Segmented linear regression analysis of an interrupted time-series design was used. MAIN OUTCOME MEASURES: all hospitalisations for 18 months pre- and postrelocation to village. SECONDARY OUTCOME: acute hospitalisations during the same time periods. RESULTS: The average hospitalisation rate (per 100 person-years) was 44.9 (95% confidence interval [CI] = 36.3-55.6) 18-10 months before village relocation, 58.9 (95% CI = 48.3-72.0) 9-1 months before moving, 47.9 (95% CI = 38.8-59.1) 1-9 months after moving and 62.4 (95% CI = 51.2-76.0) 10-18 months after moving. Monthly average hospitalisation rate (per 100 person-years) increased before relocation to village by an average of 1.2 (95% CI = 0.01-1.57, p = .04) per month from 18 to 1 month before moving, and there was a change in the level of the monthly average hospitalisation rate immediately after relocation (mean difference [MD] = -18.4 per 100 person-years, 95% CI = -32.8 to -4.1, p = .02). The trend change after village relocation did not differ significantly from that before moving. CONCLUSIONS: Although we cannot reliably claim causality, relocation to a retirement village is, for older people, associated with a significant but non-sustained reduction in hospitalisation.

Innovation in Aotearoa New Zealand's healthcare system-how to make it happen.

To date innovation in Aotearoa New Zealand healthcare services has varied around the country. As we move into a health system restructure, it is important to reflect on what has worked to date and how we can take these elements into the new system. In this paper we describe the approach at Waitemata District Health Board (DHB) including the establishment of an Institute for Innovation and Improvement. We highlight what we view as the key elements of an innovation enabling environment and suggest measures of success.

Referral for publicly funded aged care services in Indigenous populations: An exploratory cohort study of ethnic variation in Aotearoa New Zealand.

OBJECTIVES: As people age, they are more likely to require support to maintain activities of daily living. Referral for formal assessment of need (assessed using the 'international Resident Assessment Instrument' [interRAI]) is the first step to access publicly funded services in Aotearoa New Zealand (NZ). It is unclear whether ethnic access inequities present in other areas of the NZ health system occur in this referral process. This exploratory research aimed to explore ethnic variation in referrals for interRAI assessment, and associated factors. METHODS: A retrospective cohort study of all new referrals for aged care services for those 55-plus, received in 2018 by Waitemata District Health Board (WDHB), was conducted. The primary outcome was referral outcome (assessment and no assessment). Secondary outcomes included time from referral to assessment, reason for referral, mortality and, in the assessed cohort, assessment outcome. RESULTS: New referrals (n = 3263) were ethnically representative of the general older adult population in WDHB. Maori were younger and more likely to be referred for higher-level care needs than non-Maori, non-Pasifika (NMNP) (p = 0.03). There was no significant difference in referral outcome, time to assessment or mortality between ethnicities. NMNP were more likely to access lower-level care services than Maori or Pasifika older adults (p = 0.002). CONCLUSIONS: Ethnicity was not associated with aged care service assessment access once people were referred for publicly funded services, nor was it associated with time to assessment or mortality in this exploratory study. Maori had higher care needs than NMNP at the time of referral.

An interRAI derived frailty index predicts acute hospitalizations in older adults residing in retirement villages: A prospective cohort study.

OBJECTIVES: The development of frailty tools from electronically recorded healthcare data allows frailty assessments to be routinely generated, potentially beneficial for individuals and healthcare providers. We wished to assess the predictive validity of a frailty index (FI) derived from interRAI Community Health Assessment (CHA) for outcomes in older adults residing in retirement villages (RVs), elsewhere called continuing care retirement communities. DESIGN: Prospective cohort study. SETTING AND PARTICIPANTS: 34 RVs across two district health boards in Auckland, Aotearoa New Zealand (NZ). 577 participants, mean age 81 years; 419 (73%) female; 410 (71%) NZ European, 147 (25%) other European, 8 Asian (1%), 7 Maori (1%), 1 Pasifika (<1%), 4 other (<1%). METHODS: interRAI-CHA FI tool was used to stratify participants into fit (0-0.12), mild (>0.12-0.24), moderate (>0.24-0.36) and severe (>0.36) frail groups at baseline (the latter two grouped due to low numbers of severely frail). Primary outcome was acute hospitalization; secondary outcomes included long-term care (LTC) entry and mortality. The relationship between frailty and outcomes were explored with multivariable Cox regression, estimating hazard ratios (HRs) and 95% confidence intervals (95%CIs). RESULTS: Over mean follow-up of 2.5 years, 33% (69/209) of fit, 58% (152/260) mildly frail and 79% (85/108) moderate-severely frail participants at baseline had at least one acute hospitalization. Compared to the fit group, significantly increased risk of acute hospitalization were identified in mildly frail (adjusted HR = 1.88, 95%CI = 1.41-2.51, p<0.001) and moderate-severely frail (adjusted HR = 3.52, 95%CI = 2.53-4.90, p<0.001) groups. Similar increased risk in moderate-severely frail participants was seen in LTC entry (adjusted HR = 5.60 95%CI = 2.47-12.72, p<0.001) and mortality (adjusted HR = 5.06, 95%CI = 1.71-15.02, p = 0.003). CONCLUSIONS AND IMPLICATIONS: The FI derived from interRAI-CHA has robust predictive validity for acute hospitalization, LTC entry and mortality. This adds to the growing literature of use of interRAI tools in this way and may assist healthcare providers with rapid identification of frailty.

Learning from a multidisciplinary randomized controlled intervention in retirement village residents.

BACKGROUND: Retirement villages (RVs), also known as continuing care retirement communities, are an increasingly popular housing choice for older adults. The RV population has significant health needs, possibly representing a group with needs in between community-dwelling older adults and those in long-term residential care (LTC). Our previous work shows Gerontology Nurse Specialist (GNS)-facilitated multidisciplinary team (MDT) interventions may reduce hospitalizations from LTC. This study tested whether a similar intervention reduced hospitalizations in RV residents. METHODS: Open-label randomized controlled trial in which 412 older residents of 33 RVs were randomized (1:1) to an MDT intervention or usual care. SETTING: RVs across two District Health Boards in Auckland, New Zealand. Residents were eligible if considered high risk of health/functional decline (triggering ≥3 interRAI Clinical Assessment Protocols or needing special consideration identified by GNS). INTERVENTION: GNS-facilitated MDT intervention, including geriatrician/nurse practitioner and clinical pharmacist, versus usual care. Primary outcome was time from randomization to first acute hospitalization. Secondary outcomes were rate of acute hospitalizations, LTC admission, and mortality. Twelve residents died before randomization; all others (n = 400: MDT intervention = 199; usual care = 201) were included in intention-to-treat analyses. RESULTS: Mean (SD) age was 82.2 (6.9) years, 302 (75.5%) were women, and 378 (94.5%) were European. Over median 1.5 years follow-up, no difference was found in hazard of acute hospitalization between the MDT intervention (51.8%) and usual care (49.3%) groups (Hazard ratio [HR] = 1.01, 95% CI = 0.77-1.34). No difference was found in the incidence rate of acute hospitalizations between the MDT intervention (0.69 per person-year) and usual care (0.86 per person-year) groups (incidence rate ratio = 0.81, 95% CI = 0.59-1.10). Similar results were seen for the proportion of residents with LTC transition (HR = 1.18, 95% CI = 0.65-2.11) and mortality (HR = 0.70, 95% CI = 0.36-1.35). CONCLUSION: Further studies are needed to assess the effects of other patient-centered interventions and outcomes with adequate primary care integration.

Factors associated with healthcare utilization and trajectories in retirement village residents.

BACKGROUND: To study healthcare utilization and trajectories, and associated factors, in older adults in retirement villages (RVs), also known as continuing care retirement communities. METHODS: Prospective cohort study of 578 cognitively intact residents from 34 RVs in Auckland, New Zealand (NZ). MEASUREMENT: InterRAI-Community Health Assessment (includes core items that may trigger functional supplement (FS) completion in those with higher needs, and generates clinical assessment protocols (CAPs) in those with potential unmet needs). OUTCOMES: time to acute hospitalization, long-term care (LTC), and death during average 2.5 years follow-up. RESULTS: Three hundred seven (53%) residents had acute hospitalizations, 65 (11%) moved to LTC, and 51 (9%) died over a mean of 2.5 years. Factors associated with increased risk of acute hospitalization included CAP-falls (high risk) triggered, number of comorbidities, not having left RV in 2 weeks prior, moderate/severe hearing impairment, CAP-cardiorespiratory conditions triggered, acute hospitalization in year prior and age, with significant hazard ratios (HR) ranging between 1.03 and 2.90. Factors associated with reduced risk of hospitalization included other (non-NZ) European ethnicity (HR 0.73, 95% CI 0.55-0.98, p = 0.04), presence of on-site clinic (HR 0.62, 95% CI 0.45-0.85, p = 0.003), no influenza vaccination (HR 0.56, 95% CI 0.38-0.83, p = 0.004). Factors associated with LTC transition included FS triggered (HR 3.84, 95% CI 1.92-7.66, p < 0.001), CAP-instrumental activities of daily living (IADL) (HR 2.62, 95% CI 1.22-5.62, p = 0.01), CAP-social relationship triggered (HR 2.00, 95% CI 1.13-3.55, p = 0.02), and age (HR 1.13, 95% CI 1.07-1.18 p < 0.001). Factors associated with mortality included number of comorbidities (HR 3.75, 95% CI 1.54-9.10, p = 0.004 for 3-5 comorbidities), CAP-IADL triggered (HR 3.05, 95% CI 1.30-7.16, p = 0.01), and age (HR 1.11, 95% CI 1.05-1.18, p < 0.001). CONCLUSION: A large proportion of cognitively intact RV residents are admitted to hospital in mean 2.5 years of follow-up. Multiple factors were associated with acute hospitalization risk. On-site clinics were associated with reduced risk and should be considered in RV development.

Research in the retirement village community-The problems of recruiting a representative cohort of residents in Auckland, New Zealand.

OBJECTIVES: Retirement villages are semi-closed communities, access usually being gained via village managers. This paper explores issues recruiting a representative resident cohort, as background to a study of residents, to acquire sociodemographic, health and disability data and trial an intervention designed to improve outcomes. METHODS: We planned approaching all Auckland/Waitemata District villages and, via managers, contacting residents ('letter-drop'; 'door-knocks'). In 'small' villages (n ≤ 60 units), we planned contacting all residents, randomly selecting in 'larger' villages. We excluded those with doubtful or absent legal capacity. RESULTS: We approached managers of 53 of 65 villages. Thirty-four permitted recruitment. Some prohibited 'letter-drops' and/or 'door-knocks'. Hence, we recruited volunteers (23 villages) via meetings, posters, newsletters and word-of-mouth, that is representative sampling obtained from 11/34 villages. We recruited 578 residents (median age = 82 years; 420 = female; 217:361 sampled:volunteers), finding differences in baseline parameters of sampled vs. volunteers. CONCLUSION: Due to organisational/managers' policy, and national legislation restrictions, our sample does not represent our intended population well. Researchers should investigate alternative data sources, for example electoral rolls and censuses.

An interRAI-derived frailty index is associated with prior hospitalisations in older adults residing in retirement villages.

OBJECTIVES: To develop and validate a frailty index (FI) from interRAI-Community Health Assessments (CHA) on older adults in retirement villages (RVs). METHODS: This is a cross-sectional analysis of a current RV research study. A FI was generated using the cumulative deficit model. Health-care utilisation measures were acute, and all, hospitalisations 12 months before baseline assessment. Associations between FI and hospitalisations were explored using multivariable logistic regression to estimate odds ratio (OR). RESULTS: Of 577 included residents, mean (SD) age was 81 (7) and 419 (73%) were female. Mean (SD) FI was 0.16 (0.09); 260 (45%) were mildly frail, and 108 (19%) moderate-severely frail. In multivariate-adjusted analysis, odds of acute hospitalisation for mild (OR = 3.3, P < .001) and moderate-severely frail (OR = 6.4, P < .001) were significantly higher than fit residents. Higher odds were also observed for all hospitalisations. CONCLUSION: A considerable proportion of RV residents were moderately-severely frail. FI was associated with acute and all hospitalisations.

Health profile of residents of retirement villages in Auckland, New Zealand: findings from a cross-sectional survey with health assessment.

OBJECTIVES: Retirement villages (RV) have expanded rapidly, now housing perhaps one in eight people aged 75+ years in New Zealand. Health service initiatives might better support residents and offer cost advantages, but little is known of resident demographics, health status or needs. This study describes village residents-their demographics, socio-behavioural and health status-noting differences between participants who volunteered and those who were sampled. DESIGN: Cross-sectional study of village residents. The cohort formed will also be used for a longitudinal study and a randomised controlled trial. Village managers (sometimes after consulting residents) decided if representative sampling could be undertaken in each village. Where sampling was not approved, volunteers were sought. SETTING: 33 RV were included from a total of 65 villages in Auckland, New Zealand. PARTICIPANTS: Residents (n=578) were recruited either by sampling (n=217) or as volunteers (n=361) during 2016-2018. Each completed a survey and an International Resident Assessment Instrument (interRAI) health needs assessment with a gerontology nurse specialist. RESULTS: Median age of residents was 82 years, 158 (27%) were men; 61% lived alone. Downsizing (77%), less stress (63%) and access to healthcare assistance (61%) were most common reasons for entry. During the 2 weeks prior to survey, 34% received home supports and 10% personal care. Hypertension, heart disease, arthritis and pain were reported by over 40%. Most common unmet needs related to managing cardiorespiratory symptoms (50%) and pain (48%). Volunteers and sampled residents differed significantly, mainly in socio-behavioural respects. CONCLUSIONS: Common conditions including hypertension, arthritis and atrial fibrillation, are recorded in interRAI as text, and thus overlooked in interRAI reports. Levels of unmet need indicate opportunities to improve health services to better manage chronic conditions. Healthcare service providers and village operators could cooperate to design and test service initiatives that better meet residents' needs and offer cost benefits. TRIAL REGISTRATION NUMBER: ACTRN12616000685415.

The population prevalence of undetected abdominal aortic aneurysm in New Zealand Maori.

BACKGROUND: The prevalence of abdominal aortic aneurysm (AAA) in Polynesian populations such as the New Zealand Maori has not been characterized. We measured this in a large population-based sample. METHODS: A cross-sectional population-based prevalence study was conducted as part of an AAA screening pilot; 2467 Maori men aged 54 to 74 years and 1526 women aged 65 to 74 years registered with a primary care practice in Auckland (New Zealand) were invited to be screened by abdominal ultrasound between June 2016 and March 2018. Patients with pre-existing AAA disease and those with terminal conditions or circumstances that would make them unlikely to benefit from screening were excluded. The prevalence rate of AAA in Maori women was calculated with a cutoff definition of 27 mm as well as with the normal 30-mm definition (used in men). A log-binomial regression model estimated the prevalence rate at exactly 65 years for the purpose of comparison with screened populations in the United Kingdom. RESULTS: The crude prevalence rate of undiagnosed AAA in Maori men aged 60 to 74 years was 3.6%. In women, it was 1.7% at the 30-mm threshold and 2.3% at 27 mm. The prevalence rate at exactly 65 years of age was calculated from the log-binomial regression model to be 2.7% (confidence interval [CI], 2.0%-3.8%) in men, 0.9% (CI, 0.4%-2.2%) in women at the 30-mm threshold, and 1.5% (CI, 0.7%-3.0%) in women at the 27-mm threshold. Among smokers, the crude prevalence rates were 7.5% (CI, 4.9%-11.5%) in men and 6.9% (CI, 4.1%-11.5%) in women (30 mm+). CONCLUSIONS: The prevalence of undiagnosed AAA in New Zealand Maori men is considerably higher than in screened populations of equivalent age in the United Kingdom and Sweden. Prevalence rates in New Zealand Maori women are close to those of screened British men. New Zealand should consider implementing a population-based screening program for Maori men and conduct further research into the health impact of screening Maori women.

Feasibility and reliability of clinical coding surveillance for the routine monitoring of adverse drug events in New Zealand hospitals.

AIM: To explore the feasibility and reliability of Clinical Coding Surveillance (CCS) for the routine monitoring of Adverse Drug Events (ADE) and describe the characteristics of harm identified through this approach in a large district health board (DHB). METHOD: All hospital admissions at Waitemata DHB from 2015 to 2016 with an ADE-related ICD10-AM code of Y40-Y59, X40-X49 or T36-T50 were extracted from clinical coded data. The data was analysed using descriptive statistics, statistical process control and Pareto charts. Two clinicians assessed a random sample of 140 ADEs for their accuracy against what was clinically documented in medical records. RESULTS: A total of 11,999 ADEs were identified in 244,992 admissions (4.9 ADEs per 100 admissions). ADEs were more prevalent in older adults and associated with longer average length of stays and medicines such as analgesics, antibiotics, anticoagulants and diuretics. Only 2,164 (18%) of ADEs were classified as originating within hospital. Of ADEs originating outside of the hospital, the main causes were poisoning by psychotropics, anti-epileptics and anti-parkinsonism agents and non-opioid analgesics. Clinicians agreed that 91% of ADE positive admissions were accurately classified as per clinical documentation. CONCLUSION: CCS is a feasible and reliable approach for the routine monitoring of ADEs in hospitals.

Pathways to ambulatory sensitive hospitalisations for Maori in the Auckland and Waitemata regions.

AIM: Ambulatory Sensitive Hospitalisations (ASH) are a group of conditions potentially preventable through interventions delivered in the primary health care setting. ASH rates are consistently higher for Maori compared with non-Maori. This study aimed to establish Maori experience of factors driving the use of hospital services for ASH conditions, including barriers to accessing primary care. METHOD: A telephone questionnaire exploring pathways to ASH was administered to Maori (n=150) admitted to Auckland and Waitemata District Health Board (DHB) hospitals with an ASH condition between January 1st-June 30th 2015. RESULTS: A cohort of 1,013 participants were identified; 842 (83.1%) were unable to be contacted. Of the 171 people contactable, 150 agreed to participate, giving an overall response rate of 14.8% and response rate of contactable patients of 87.7%. Results demonstrated high rates of self-reported enrolment, utilisation and preference for primary care. Many participants demonstrated appropriate health seeking behaviour and accurate recall of diagnoses. While financial barriers to accessing primary care were reported, non-financial barriers including lack of after-hours provision (12.6% adults, 37.7% children), appointment availability (7.4% adults, 17.0% children) and lack of transport (13.7% adults, 20.8% children) also featured in participant responses. CONCLUSIONS: Interventions to reduce Maori ASH include: timely access to primary care through electronic communications, increased appointment availability, extended opening hours, low cost after-hours care and consistent best management of ASH conditions in general practice through clinical pathways. Facilitated enrolment of ASH patients with no general practitioner could also reduce ASH. Research into transport barriers and enablers for Maori accessing primary care is required to support future interventions.

Polypill-based therapy likely to reduce ethnic inequities in use of cardiovascular preventive medications: Findings from a pragmatic randomised controlled trial.

OBJECTIVE: The purpose of this study was to investigate the consistency of the proportional effect of fixed-dose combination therapy (the 'polypill') on the use of recommended cardiovascular preventative medications among indigenous Maori and non-indigenous adults in New Zealand. METHODS: We randomised Maori and non-Maori primary care patients at high risk of cardiovascular disease (either because of a prior event or with an estimated 5-year risk of a first event of at least 15%) to a polypill (containing aspirin, statin and two antihypertensives) or usual care for a minimum of 12 months. All patients had indications for all polypill components according to their general practitioner, and all medications (including the polypill) were prescribed by the patient's general practitioner and dispensed at community pharmacies. The main outcome for this study was the use of all recommended medications (antiplatelet, statin and two antihypertensives) at 12 months. Heterogeneity in the effect of polypill-based care compared with usual care on this outcome by ethnicity was assessed by logistic regression. RESULTS: Baseline use of recommended medications was 36% (93/257) among Maori and 51% (130/156) among non-Maori participants. Polypill-based care was associated with an increase in the use of recommended medications among Maori (relative risk [RR]: 1.87; 95% confidence interval [CI]: 1.50-2.34) and non-Maori (RR: 1.66; 95% CI: 1.37-2.00) when compared with usual care at 12 months, and there was no statistically significant heterogeneity in this outcome by ethnicity (p = 0.92). CONCLUSION: Polypill-based care is likely to reduce absolute inequities between Maori and non-Maori in the use of recommended cardiovascular preventative medications given baseline absolute differences and the consistency of the proportional effect of this intervention by ethnicity in this pragmatic trial in primary care.

Do polypills lead to neglect of lifestyle risk factors? Findings from an individual participant data meta-analysis among 3140 patients at high risk of cardiovascular disease.

AIM: The aim of this study was to investigate whether polypill-based care for the prevention of cardiovascular disease (CVD) is associated with a change in lifestyle risk factors when compared with usual care, among patients with CVD or high calculated cardiovascular risk. METHODS: We conducted an individual participant data meta-analysis of three trials including patients from Australia, England, India, Ireland, the Netherlands and New Zealand that compared a strategy using a polypill containing aspirin, statin and antihypertensive therapy with usual care in patients with a prior CVD event or who were at high risk of their first event. Analyses investigated any differential effect on anthropometric measures and self-reported lifestyle behaviours. RESULTS: Among 3140 patients (75% male, mean age 62 years and 76% with a prior CVD event) there was no difference in lifestyle risk factors in those randomised to polypill-based care compared with usual care over a median of 15 months, either across all participants combined, or in a range of subgroups. Furthermore, narrow confidence intervals (CIs) excluded any major effect; for example differences between the groups in body mass index was -0.1 (95% CI -0.2 to 0.1) kg/m(2), in weekly duration of moderate intensity physical activity was -2 (-26 to 23) minutes and the proportion of smokers was 16% vs 17% (RR 0.98, 0.84 to 1.15) at the end of trial. DISCUSSION: This analysis allays concern that polypill-based care may lead to neglect of lifestyle risk factors, at least among high-risk patients. Maximally effective preventive approaches should address lifestyle factors alongside pharmaceutical interventions, as recommended by major international guidelines.

Evaluation of a New Zealand program to improve transition of care for older high risk adults.

Transition interventions aim to improve care and reduce hospital readmissions but evaluations of these interventions have reported inconsistent results. We report on the evaluation of an intervention implemented in Auckland, New Zealand. Participants were people over the age of 65 who had an acute medical admission and were at high risk of readmission. The intervention included an improved discharge process and nurse telephone follow-up soon after discharge. Outcomes were 28 day readmission rates and emergency attendances. The study is observational, using both interrupted times series and regression discontinuity designs. 5239 patients were treated over a one year period. There was no change in readmission rates or ED attendances or secondary outcomes. Not all patients received all components of the intervention. This transition intervention was not successful. Possible reasons for this and implications are discussed. Although non-experimental methods were used, we believe the results are robust.

Different needs or treated differently? Understanding ethnic inequalities in coronary revascularisation rates.

BACKGROUND: Several studies have reported major ethnic inequalities in cardiac revascularisation. This paper attempts to explain why in New Zealand, Maori and Pacific patients may be less likely to receive cardiac revascularisation interventions than Europeans. METHODS: Angiograms of 55 Maori, 45 Pacific and 100 age-sex matched European patients with ST elevation myocardial infarction were reviewed by two cardiologists blinded to the patients' ethnicity to determine ethnic differences in actual and recommended revascularisation likelihood. RESULTS: Maori and Pacific patients were 18% (95% C.I. 6%-29%) less likely to receive cardiac revascularisation procedures compared to European patients. If intervention had been based on the recommendation from blinded angiogram review they would have been 14% (2%-24%) less likely to receive revascularisation. Maori and Pacific were significantly more likely to be recommended for CABG (RR=2.9; C.I. 1.4-5.8) and less likely for PCI (RR=0.60; 0.48-0.75). Maori and Pacific were at significantly higher risk of under-treatment overall (RR=5.0; 1.1-22.8) and for CABG (RR=8.0; 1.0-64.0), but not for PCI (RR=2.0; 0.2-22.1). However these relative risks became non-significant when cases not eligible for surgery due to comorbidities were excluded. CONCLUSIONS: Maori and especially Pacific STEMI patients present with a pattern of ischaemic heart disease that is less amenable to PCI, even after allowing for differences in the number of diseased vessels and diabetes prevalence. The lower likelihood of Maori and Pacific patients receiving recommended CABG is largely explained by higher comorbidity prevalence.

Ethnic differences in coronary artery revascularisation in New Zealand: does the inverse care law still apply?

BACKGROUND: In 2002 striking differences in cardiac revascularisation rates were reported between New Zealand Maori, Pacific and European ethnicities. This paper examines whether this inequity still exists, taking into account ethnic differences in need. METHODS: Age-standardised time trends in intervention rates for coronary artery bypass grafts (CABG), percutaneous coronary intervention (PCI) and ST elevation myocardial infarction (STEMI) were calculated by ethnicity. Ethnic-specific trends were also calculated in the ratio of observed to expected CABG and PCI interventions based on the rate of hospitalisation with a diagnosis of STEMI. RESULTS: On a per capita basis, standardised CABG intervention rates were significantly higher for Pacific (both sexes) and female Maori than Other throughout 2000-2012, and were significantly higher for Maori males than Other in 2009-12. Population based PCI rates were significantly lower for male Maori from 2000-2012, while for female Maori they were significantly lower in 2000-2004 but significantly higher in 2009-12. However, and despite some improvement since 2000-2004, Maori and Pacific intervention numbers for PCI in 2009-2012 were still 22%-32% lower than expected for the rate of STEMI hospitalisation they experience. Overall revascularisation ratios were significantly lower than expected for Maori (both sexes) and Pacific females. CONCLUSIONS: Large increases in the PCI population intervention rates in Maori and Pacific over the period 2000-2012 have not been sufficient to eliminate inequalities in relation to need, except perhaps for Pacific men.