How effective are programs at managing transition from hospital to home? A case study of the Australian Transition Care Program

Effect of Dementia on Outcomes After Surgically Treated Hip Fracture in Older Adults

BACKGROUND

Hip fractures are associated with increased mortality and functional limitations. However, the effect that dementia has on these outcomes in individuals in aged care settings after fracture is not well established. This study examined the association of dementia with post-hip fracture mortality, permanent residential aged care entry, transition care use, and change in activities of daily living (ADL) needs.

METHODS

A retrospective cohort study using data from the Registry of Senior Australians (2003-2015) was conducted. Individuals with a hip fracture while receiving aged care services were included. Associations of dementia with mortality, risks of transition and permanent care use, and ADL needs progression were estimated using multivariable Cox, Fine-Gray, and logistic regression methods, respectively.

RESULTS

Of 4771 individuals evaluated, 76% were women, the median age was 86 years (IQR 82-90), and 71% already lived in permanent residential aged care at the time of fracture. Within two years of their hip fracture, 50.4% (95% CI 48.9%-51.8%) of individuals died, 16.2% (95% CI 14.2%-18.2%) entered a transition care program, 59.1% (95% CI 56.5%-61.7%) entered permanent residential aged care, and 32% had greater ADL needs. Dementia was associated with higher risk of two-year mortality (HR = 1.19, 95% CI 1.09-1.30), 90-day entry into permanent care (sHR = 1.96, 95% CI 1.60-2.38), and increased likelihood of ADL limitations (OR = 1.36, 95% CI 1.00-1.85). Minor differences were seen in transition care use by dementia status.

CONCLUSION

Dementia is a strong risk factor for mortality after hip fractures in individuals in aged care settings and associated with a high risk of entry into permanent care.

LEVEL OF EVIDENCE

Prognostic level III.

Factors associated with success in transition care services among older people in Australia

BACKGROUND

The Australian Transition Care Program (TCP) is a national intermediate care service aiming to optimise functional independence and delay entry to permanent care for older people leaving hospital. The aim of this study was to describe the outcomes of TCP and identify demographic and clinical factors associated with TCP 'success', to assist with clinical judgements about suitable candidates for the program.

METHOD

We conducted a descriptive cohort study of all older Australians accessing TCP for the first time between 2007 and 2015. Logistic regression models assessed demographic and clinical factors associated with change in performance on a modified Barthel Index from TCP entry to discharge and on discharge to community. Fine-Gray regression models estimated factors associated with transition to permanent care within 6 months of TCP discharge, with death as a competing event.

RESULTS

Functional independence improved from entry to discharge for 46,712 (38.4%) of 124,301 TCP users. Improvement was more common with younger age, less frailty, shorter hospital stay prior to TCP, and among women, those without a carer, living outside a major city, and without dementia. People who received TCP in a residential setting were far less likely to record improved functional impairment and more likely to be discharged to permanent care than those in a community setting. Discharge to community was more common with younger age and among women and those without dementia. Nearly 12% of community TCP and 63% of residential TCP users had transitioned to permanent care 6 months after discharge. Entry to permanent care was more common with older age, higher levels of frailty, and among those with dementia.

CONCLUSIONS

More than half of TCP users are discharged to home and remain at home after 6 months. However, residential-based TCP may have limited efficacy. Age, frailty, carer status, and dementia are key factors to consider when assessing program suitability. Future studies comparing users to a suitably matched control group will be very helpful for confirming whether the TCP program is meeting its aims.

The effect of caregiver's and nurse's perception of a patient's discharge readiness on postdischarge medical resource consumption

AIMS

The purpose of this study was to validate patient's primary caregiver and their nurse's perception of patient discharge readiness assessment and their association with postdischarge medical consumption.

DESIGN

The study employed a descriptive research, prospective longitudinal study design.

METHOD

The study was performed in a ward of a medical centre in Taipei, Taiwan, from June 2017-May 2018. Obtained data were analysed using an independent t test, one-way ANOVA and logistic regression approach.

RESULTS/FINDINGS

The number of comorbidities and the number of days of hospital stay were positively associated with post discharge emergency room visits. Caregiver readiness for hospital discharge had significant negative correlation with patient's 30-day readmission. Both caregiver and nurse readiness for the hospital discharge scale score were not factors associated with the patients' 30-day emergency room visit.

CONCLUSION

Based on the research findings, to assess the discharge readiness as perceived by caregivers at patients' discharge is recommended.

IMPACT

Caregiver and nurse scores on readiness for hospital discharge showed a significant positive correlation. The higher the score of a caregiver's readiness for a patient's hospital discharge, the lower the 30-day readmission rate. Family-centred care enables patients to safely pass though the transition phase from hospital to community and reduces the postrelease consumption of medical resources. The discharge readiness perceived by caregivers should be included in any decision-making.

Factors associated with accessing aged care services in Australia after approval for services: Findings from the historical cohort of the Registry of Senior Australians

OBJECTIVE

To evaluate the access of approved aged care services and factors associated with accessing these services.

METHODS

A retrospective cohort study was conducted (1/7/2003-30/6/2013). The incidence of accessing permanent residential, home and respite care services within one year or transition care within 28 days of approval was evaluated. The association of participants' socio-demographic characteristics, limitations, health conditions and assessment characteristics with service use was evaluated.

RESULTS

In 799 750 older Australians, the incidence of accessing approved permanent residential care within one year was 70.9% (95% confidence interval [CI] 70.8%-71.0%), home care 49.5% (95% CI 49.3%-49.7%) and respite 41.8% (95% CI 41.7%-41.9%). The incidence of accessing transition care at 28 days was 78.5% (95% CI 78.2%-78.7%). Aged care seekers', assessments' and assessors' characteristics are associated with service access.

CONCLUSION

Monitoring the use of aged care service approvals is necessary for the identification of service access barriers to support evidence-based policy changes.

Effectiveness and analysis of factors predictive of discharge to home in a 4-year cohort in a residential transitional care unit

OBJECTIVE

The aim of this study was to evaluate the effectiveness and identify factors predictive of home discharge in a cohort of patients admitted to the residential Transitional Aged Care Program (r-TACP) after a stay in an acute hospital.

METHODS

A retrospective observational cohort study of patients admitted to a single r-TACP unit between 1 January 2014 and 31 December 2017 was carried out. Baseline patient characteristics and discharge outcomes were analyzed.

RESULTS

Three hundred sixty-nine patients were admitted during the study period. The discharge outcomes were as follows: 68% returned home, 17% went onto residential care, 14% were readmitted to hospital, and 1% died. Factors associated with not returning home were increased age, increased comorbidities, and lower Barthel Index on admission to the r-TACP.

CONCLUSION

Our r-TACP is an effective program that successfully returns the majority (67.8%) of older patients home after an acute hospital admission. Older patients with greater comorbidities and poorer baseline functional status in our program were less likely to return home.

Regional data exchange to improve care for veterans after non-VA hospitalization: a randomized controlled trial

BACKGROUND

Coordination of care, especially after a patient experiences an acute care event, is a challenge for many health systems. Event notification is a form of health information exchange (HIE) which has the potential to support care coordination by alerting primary care providers when a patient experiences an acute care event. While promising, there exists little evidence on the impact of event notification in support of reengagement into primary care. The objectives of this study are to 1) examine the effectiveness of event notification on health outcomes for older adults who experience acute care events, and 2) compare approaches to how providers respond to event notifications.

METHODS

In a cluster randomized trial conducted across two medical centers within the U.S. Veterans Health Administration (VHA) system, we plan to enroll older patients (≥ 65 years of age) who utilize both VHA and non-VHA providers. Patients will be enrolled into one of three arms: 1) usual care; 2) event notifications only; or 3) event notifications plus a care transitions intervention. In the event notification arms, following a non-VHA acute care encounter, an HIE-based intervention will send an event notification to VHA providers. Patients in the event notification plus care transitions arm will also receive 30 days of care transition support from a social worker. The primary outcome measure is 90-day readmission rate. Secondary outcomes will be high risk medication discrepancies as well as care transitions processes within the VHA health system. Qualitative assessments of the intervention will inform VHA system-wide implementation.

DISCUSSION

While HIE has been evaluated in other contexts, little evidence exists on HIE-enabled event notification interventions. Furthermore, this trial offers the opportunity to examine the use of event notifications that trigger a care transitions intervention to further support coordination of care.

TRIAL REGISTRATION

ClinicalTrials.gov NCT02689076. "Regional Data Exchange to Improve Care for Veterans After Non-VA Hospitalization." Registered 23 February 2016.

Simulation of health care and related costs in people with dementia in Australia

Objectives The aim of this study was to develop a validated model to predict current and future Australian costs for people with dementia to help guide decision makers allocate scarce resources in the presence of capacity constraints. Methods A hybrid discrete event simulation was developed to predict costs borne in Australia for people with dementia from 2015 to 2050. The costs captured included community-based care, permanent and respite residential aged care, hospitalisation, transitional care, pharmaceuticals, aged care assessments, out of hospital medical services and other programs. Results The costs borne for people with dementia in Australia are predicted to increase from A$11.8 billion in 2015 to A$33.6 billion in 2050 at 2013-14 prices, ceteris paribus. If real per capita health and social expenditure increased by 1.0% annually, these costs are predicted to increase by around A$14.2 billion to a total of around A$47.8 billion by 2050. Conclusions This simulation provides useful estimates of the potential future costs that will be borne for people with dementia and allows the exploration of the effects of capacity constraints on these costs. The model demonstrates that the level of real annual per capita growth in health and social expenditure has significant implications for the future sustainability of dementia care in Australia. What is known about the topic? With the aging of the Australian population, the number of people living with dementia is predicted to rise markedly in the next four decades. As the number of people living with dementia increases, so too will the financial burden these debilitating and degenerative diseases place on private and public resources. These increases are likely to challenge the efficiency and sustainability of many health systems in the developed world. What does this paper add? This research provides a validated model to predict current and future Australian costs for people with dementia to help guide decision makers allocate scarce resources in the presence of capacity constraints (i.e. where the supply of resources does not meet demand). The model predicts an increase in costs for people with dementia from A$11.8 billion in 2015 to A$33.6 billion in 2050 at 2013-14 prices. If real per capita health and social expenditure increased by 1.0% annually, these costs are predicted to increase by around A$14.2 billion to a total of around A$47.8 billion by 2050. What are the implications for practitioners? This simulation provides useful estimates of the potential future costs that will be borne for people with dementia and allows the exploration of the effects of capacity constraints on these costs. The model demonstrates that the level of real annual per capita growth in health and social expenditure has significant implications for the future sustainability of dementia care in Australia.

Improving care coordination for community-dwelling older Australians: a longitudinal qualitative study

Objective The aim of the present study was to describe the care transition experiences of older people who transfer between subacute and primary care, and to identify factors that influence these experiences. A further aim of the study was to identify ways to enhance the Geriatric Evaluation and Management (GEM) model of care and improve local coordination of services for older people. Methods The present study was an exploratory, longitudinal case study involving repeat interviews with 19 patients and carers, patient chart audits and three focus groups with service providers. Interview transcripts were coded and synthesised to identify recurring themes. Results Patients and carers experienced care transitions as dislocating and unpredictable within a complex and turbulent service context. The experience was characterised by precarious self-management in the community, floundering with unmet needs and holistic care within the GEM service. Patient and carer attitudes to seeking help, quality and timeliness of communication and information exchange, and system pressure affected care transition experiences. Conclusion Further policy and practice attention, including embedding early intervention and prevention, strengthening links between levels of care by building on existing programs and educative and self-help initiatives for patients and carers is recommended to improve care transition experiences and optimise the impact of the GEM model of care. What is known about the topic? Older people with complex care needs experience frequent care transitions because of fluctuating health and fragmentation of aged care services in Australia. The GEM model of care promotes multidisciplinary, coordinated care to improve care transitions and outcomes for older people with complex care needs. What does this paper add? The present study highlights the crucial role of the GEM service, but found there is a lack of systemised linkages within and across levels of care that disrupts coordinated care and affects care transition experiences. There are underutilised opportunities for early intervention and prevention across the system, including the emergency department and general practice. What are the implications for practitioners? Comprehensive screening, assessment and intervention in primary and acute care, formalised transition processes and enhanced support for patients and carers to access timely, appropriate care is required to achieve quality, coordinated care transitions for older people.

Elderly patients are at high risk of night-time admission to the intensive care unit following a rapid response team call

Previous studies have shown that elderly patients (age ≥65 years) are less likely to be admitted to the intensive care unit following a rapid response team call and have high hospital mortality rates. This study has shown that elderly patients have a significantly higher probability of being admitted to an intensive care unit following a rapid response team call at night than during the day. However, at no time are they at greater risk than younger patients of incomplete vital sign recording, a failure to escalate care for acute deterioration or mortality.

Community Care for People with Complex Care Needs: Bridging the Gap between Health and Social Care

INTRODUCTION

A growing number of people are living with complex care needs characterized by multimorbidity, mental health challenges and social deprivation. Required is the integration of health and social care, beyond traditional health care services to address social determinants. This study investigates key care components to support complex patients and their families in the community.

METHODS

Expert panel focus groups with 24 care providers, working in health and social care sectors across Toronto, Ontario, Canada were conducted. Patient vignettes illustrating significant health and social care needs were presented to participants. The vignettes prompted discussions on i) how best to meet complex care needs in the community and ii) the barriers to delivering care to this population.

RESULTS

Categories to support care needs of complex patients and their families included i) relationships as the foundation for care, ii) desired processes and structures of care, and iii) barriers and workarounds for desired care.

DISCUSSION AND CONCLUSIONS

Meeting the needs of the population who require health and social care requires time to develop authentic relationships, broadening the membership of the care team, communicating across sectors, co-locating health and social care, and addressing the barriers that prevent providers from engaging in these required practices.

Managing risk during care transitions when approaching end of life: A qualitative study of patients' and health care professionals' decision making

BACKGROUND

Increasing importance is being placed on the coordination of services at the end of life.

AIM

To describe decision-making processes that influence transitions in care when approaching the end of life.

DESIGN

Qualitative study using field observations and longitudinal semi-structured interviews.

SETTING/PARTICIPANTS

Field observations were undertaken in three sites: a residential care home, a medical assessment unit and a general medical unit in New Zealand. The Supportive and Palliative Care Indicators Tool was used to identify participants with advanced and progressive illness. Patients and family members were interviewed on recruitment and 3-4 months later. Four weeks of fieldwork were conducted in each site. A total of 40 interviews were conducted: 29 initial interviews and 11 follow-up interviews. Thematic analysis was undertaken.

FINDINGS

Managing risk was an important factor that influenced transitions in care. Patients and health care staff held different perspectives on how such risks were managed. At home, patients tolerated increasing risk and used specific support measures to manage often escalating health and social problems. In contrast, decisions about discharge in hospital were driven by hospital staff who were risk-adverse. Availability of community and carer services supported risk management while a perceived need for early discharge decision making in hospital and making 'safe' discharge options informed hospital discharge decisions.

CONCLUSION

While managing risk is an important factor during care transitions, patients should be able to make choices on how to live with risk at the end of life. This requires reconsideration of transitional care and current discharge planning processes at the end of life.

Using the International Classification of Functioning, Disability and Health framework to categorise goals and assess goal attainment for transition care clients

AIM

To classify goals according to the International Classification of Functioning, Disability and Health (ICF) and to examine factors associated with goal attainment for transition care program (TCP) clients.

METHODS

Recorded goals at admission were rated at discharge as achieved, partially achieved or not achieved. Two researchers independently linked each statement to the most closely corresponding ICF categories.

RESULTS

Of 268 TCP clients, 215 had 851 goal statements recorded. Of these, 794 (93%) statements were linked to 12 different ICF categories. A total of 515 (61.4%) were attained at discharge, 117 (14%) were partially attained and 207 (24.6%) were not attained. Multivariate analysis identified number of goals, TCP length of stay and high or very high case manager perception of goal attainment to be significant predictors for goal attainment.

CONCLUSIONS

The ICF framework can be used to identify and structure clients' goals in transitional care. Goal attainment can be used to determine overall functional improvement.

Developing an Australian health and aged care research agenda: a systematic review of evidence at the subacute interface

Objective The aim of the present study was to systematically review articles describing recent interventions that aimed to improve access and outcomes for older people at the interface between health and aged care, with a focus on subacute care programs of palliative care, rehabilitation, geriatric evaluation and management (GEM) and psychogeriatrics. Methods Australian studies published between 2008 and 2013were evaluated using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and National Health and Medical Research Council of Australia (NHMRC) guidelines. Included studies were summarised according to focus areas and results discussed in the current Australian subacute health care context. Results Eleven Australian research articles were identified. Three did not achieve any NHMRC rating level because of methodological approach. Focus areas included: discharge planning; information management or communication; rehabilitation; hospital treatment in residential care; screening and intervention; and Telehealth. Interventions were primarily system centred; only three studies featured patient-level outcome measures. Conclusions There is limited high-quality research investigating the effectiveness of interventions at the health and aged care interface of subacute care. Further research is needed. What is known about the topic? Subacute care offers important healthcare programs for older people, operating at the interface between health and aged care. However, for the most part this has not been subject to research scrutiny. What does this paper add? Identified studies were predominantly hospital oriented and designed to avoid hospital admission and associated costs. Locally integrated, collaborative and multidiscipline based interventions improve system-level outcomes. Alternative and individualised models of care, particularly when provided in their home setting, yields positive outcomes for older people. What are the implications for practitioners? Health and aged care reforms and related research agenda must include the perspectives and experiences of patients and/or carers accessing subacute care programs, yet these are under-reported. The present review highlights opportunities to improve the quality of existing evidence and create a research agenda for the future.

Research in hospital discharge procedures addresses gaps in care continuity in the community, but leaves gaping holes for people with dementia: a review of the literature

AIM

To examine the literature on the impact of the discharge experience of patients with dementia and their continuity of care.

METHODS

Peer-reviewed and grey literature published in the English language between 1995 and 2014 were systematically searched using Medline, CINAHL, PubMed, PsycINFO and Cochrane library databases, using a combination of the search terms Dementia, Caregivers, Integrated Health Care Systems, Managed Care, Patient Discharge. Also reviewed were Department of Health and Ageing and Alzheimer's Australia research reports between 2000 and 2014.

RESULTS

The review found a wide range of studies that raise concerns in relation to the quality of care provided to people with dementia during hospital discharge and in transitional care.

CONCLUSION

Discharge planning and transitional care for patients with dementia are not adequate and are likely to lead to readmission and other poor health outcomes.

Role of context in care transition interventions for medically complex older adults: a realist synthesis protocol

INTRODUCTION

Approximately 30-50% of older adults have two or more conditions and are referred to as multimorbid or complex patients. These patients often require visits to various healthcare providers in a number of settings and are therefore susceptible to fragmented healthcare delivery while transitioning to receive care. Care transition interventions have been implemented to improve continuity of care, however, current evidence suggests that some interventions or components of interventions are only effective within certain contexts. There is therefore a need to unpack the mechanisms of how and within which contexts care transition interventions and their components are effective. Realist review is a synthesis method that explains how complex programmes work within various contexts. The purpose of this study is to explain the effect of context on the activities and mechanisms of care transition interventions in medically complex older adults using a realist review approach.

METHODS AND ANALYSIS

This synthesis will be guided by Pawson and colleagues' 2004 and 2005 protocols for conducting realist reviews. The underlying theories of care transition interventions were determined based on an initial literature search using relevant databases. English language peer-reviewed studies published after 1993 will be included. Several relevant databases will be searched using medical subject headings and text terms. A screening form will be piloted and titles, abstracts and full text of potentially relevant articles will be screened in duplicate. Abstracted data will include study characteristics, intervention type, contextual factors, intervention activities and underlying mechanisms. Patterns in Context-Activity-Mechanism-Outcome (CAMO) configurations will be reported.

ETHICS AND DISSEMINATION

Internal knowledge translation activities will occur throughout the review and existing partnerships will be leveraged to disseminate findings to frontline staff, hospital administrators and policymakers. Finalised results will be presented at local, national and international conferences, and disseminated via peer-reviewed publications in relevant journals.

Outcomes of cognitively impaired older people in Transition Care

AIM

The benefits of Transition Care Programs (TCPs) for patients with cognitive impairment are not well established. This study aimed to investigate the impact of TCP on patients according to their cognitive status.

METHODS

In this prospective cohort study, 351 patients were comprehensively assessed at TCP admission using the interRAI Home Care instrument and divided into two groups based on scores on the Cognitive Performance Scale.

RESULTS

Of 346 patients assessed for cognition, 242 (69.9%) were considered cognitively intact, and 104 (30.1%) were classified as cognitively impaired (Cognitive Performance Scale ≥ 2). There were no significant differences in TCP outcomes between the two groups, including community living at six months (P = 0.1), hospital readmission rates (P = 0.6), or achievement of TCP goals (P = 0.3).

CONCLUSIONS

Cognitively intact and cognitively impaired patients have similar outcomes post-TCP. Older patients should not be refused Transition Care based on the presence of cognitive impairment.

The evidence-policy divide: a 'critical computational linguistics' approach to the language of 18 health agency CEOs from 9 countries

BACKGROUND

There is an emerging body of literature suggesting that the evidence-practice divide in health policy is complex and multi-factorial but less is known about the processes by which health policy-makers use evidence and their views about the specific features of useful evidence. This study aimed to contribute to understandings of how the most influential health policy-makers view useful evidence, in ways that help explore and question how the evidence-policy divide is understood and what research might be supported to help overcome this divide.

METHODS

A purposeful sample of 18 national and state health agency CEOs from 9 countries was obtained. Participants were interviewed using open-ended questions that asked them to define specific features of useful evidence. The analysis involved two main approaches 1)quantitative mapping of interview transcripts using Bayesian-based computational linguistics software 2)qualitative critical discourse analysis to explore the nuances of language extracts so identified.

RESULTS

The decision-making, conclusions-oriented world of policy-making is constructed separately, but not exclusively, by policy-makers from the world of research. Research is not so much devalued by them as described as too technical- yet at the same time not methodologically complex enough to engage with localised policy-making contexts. It is not that policy-makers are negative about academics or universities, it is that they struggle to find complexity-oriented methodologies for understanding their stakeholder communities and improving systems. They did not describe themselves as having a more positive role in solving this challenge than academics.

CONCLUSIONS

These interviews do not support simplistic definitions of policy-makers and researchers as coming from two irreconcilable worlds. They suggest that qualitative and quantitative research is valued by policy-makers but that to be policy-relevant health research may need to focus on building complexity-oriented research methods for local community health and service development. Researchers may also need to better explain and develop the policy-relevance of large statistical generalisable research designs. Policy-makers and public health researchers wanting to serve local community needs may need to be more proactive about questioning whether the dominant definitions of research quality and the research funding levers that drive university research production are appropriately inclusive of excellence in such policy-relevant research.

The relationship between quality of life, health and care transition: an empirical comparison in an older post-acute population

Background

The aim of this study was to explore, via empirical comparison, the relationship between quality of life, as measured by the ICECAP-O capability index (a new instrument designed to measure and value quality of life in older people), with both self-reported health status and the quality of care transition in adults aged 65 and over participating in two post acute rehabilitation programs (outpatient day rehabilitation and the Australian National Transition Care residential program).

Methods

The ICECAP-O was administered to patients receiving either outpatient day rehabilitation (n = 53) or residential transition care (n = 29) during a face to face interview. The relationships between the ICECAP-O and other instruments, including the EQ-5D (a self-reported measure of health status) and CTM-3 (a self-reported measure of the quality of care transitions), the type of post-acute care being received and socio-demographic characteristics were examined.

Results

The mean ICECAP-O score for the total sample was 0.81 (SD: 0.15). Patients receiving outpatient day rehabilitation generally reported higher levels of capability, than patients receiving residential transition care (mean 0.82 [SD: 0.15] and 0.79 [SD: 0.164] respectively), however these differences were not statistically significant. The mean EQ-5D score for the total sample was somewhat lower than the ICECAP-O (mean 0.55; SD: 0.27) indicating significant levels of health impairment with the outpatient day rehabilitation group demonstrating slightly higher levels of health status than the transition care group (mean 0.54 [SD: 0.254] and mean 0.49 [SD: 0.30]). The ICECAP-O was found to be positively correlated with both the CTM-3 (Spearman’s r =0.234; p ≤ 0.05) and the EQ-5D (Spearman’s r = 0.437; p ≤ 0.001). The relationships between the total EQ-5D and CTM-3 scores and the individual attributes of the ICECAP-O indicate health status and quality of care transition in this patient population to be influential in some, but not all aspects of capability.

Conclusions

The correlations between the ICECAP-O, EQ-5D and CTM-3 instruments illustrate that capability is strongly and positively associated with health-related quality of life and the quality of care transitions. However further research is required to further examine the construct validity of the ICECAP-O and to examine its potential for incorporation into economic evaluation.