Guidance on the use of complex systems models for economic evaluations of public health interventions.

To help health economic modelers respond to demands for greater use of complex systems models in public health. To propose identifiable features of such models and support researchers to plan public health modeling projects using these models. A working group of experts in complex systems modeling and economic evaluation was brought together to develop and jointly write guidance for the use of complex systems models for health economic analysis. The content of workshops was informed by a scoping review. A public health complex systems model for economic evaluation is defined as a quantitative, dynamic, non-linear model that incorporates feedback and interactions among model elements, in order to capture emergent outcomes and estimate health, economic and potentially other consequences to inform public policies. The guidance covers: when complex systems modeling is needed; principles for designing a complex systems model; and how to choose an appropriate modeling technique. This paper provides a definition to identify and characterize complex systems models for economic evaluations and proposes guidance on key aspects of the process for health economics analysis. This document will support the development of complex systems models, with impact on public health systems policy and decision making.

Soft infrastructure: the critical community-level resources reportedly needed for program success.

BACKGROUND: The mechanisms typically used to fund health promotion in communities, either as part of an effort to scale-up programs or to support the design of local activities, often pay insufficient attention to the foundational means of enhancing well-being. Only recently have researchers begun to critically 'unpack' how funding processes connect with and activate local community capacities. METHODS: We conducted a thematic analysis of 33 interviews with policy and program administrators in public health and local community workers and volunteers. We invited them to expound on their understandings of resources - specifically, what needs to be in place to make funded programs successful and/or what do communities draw on to make funded programs effective. RESULTS: Policy and program administrators reflected mostly on the importance of traditional resources, such as adequate funding and staffing. Community-based participants often went further to describe psychological and sociological resources - the "soft infrastructure" which included trust and hope. Both groups emphasised the importance of building networks and relationships at multiple levels. Community workers also provided examples of how resources grow and improve in value in combination with other processes or through pathways of resource use or resource distribution. So, resources like information/knowledge are made more valuable when relayed locally. Physical amenities (e.g., meeting spaces, kitchens) have an instrumental role, but also act powerfully as a symbolic resource for identity. Participants reported that funding processes can damage the resources required for community health improvement. Funding instability undermines capacity. The ongoing threat of funding removal was described by one administrator as community "bullying". CONCLUSIONS: Processes of health promotion funding, and even standard processes of program scale-up and readiness assessment, risk underestimating the range of resources that are fundamental for community health improvement, particularly among disadvantaged communities. Funders should design ways to resource communities so that there is constant attention to and coaching of critically important diverse processes of resource growth, independent of program-specific funds.

Icing or cake? Grant competitions as a model for funding chronic disease prevention in Tasmania, Australia.

Competitive grant funding is a well-established mechanism for generating activity and interventions in the field of chronic disease prevention. Yet grant competitions may be burdensome for organizations, and money may not be enough to bring about lasting change in communities. In this study, we explore the dynamics of awarding and receiving money in the context of a state-level government grant competition to support community organizations and promote community-driven action for health and well-being in Tasmania, Australia. Drawing on reflections of successful grant recipients and real-time observation of grant decision-making, we consider the role and value of grant competitions both for individual organizations and for generating broader change processes. We found that grant competitions operated according to an 'icing-on-the-cake' approach to funding, whereby money was provided for extra activities and new initiatives. In this way, the grant competition was valuable not only for stimulating new programme activities but also to effect broader organizational change, such as developing planning capacity, igniting new directions and pushing organizations towards 'health'-focused activities. But for smaller organizations, grant funding was often stretched to support core work (i.e. cake rather than icing). Grants targeting specific focus areas could be a drain on resources if they diverted staff time away from core activities. We suggest an alternative approach to funding in which grants are able to be more responsive to the needs of community organizations and the support they require, as well as to desired outcomes. We describe the policy response to the results to date.

When a person attends a class on buying, storing and cooking fresh vegetables, or enrols in a walking group, or joins others to learn first aid, this 'community-based health promotion' is often the product of ideas and actions taken by staff employed in health services, local government and the community sector (e.g. neighbourhood houses). Grant competitions are intended to foster new ideas by providing money for new services, equipment or expertise. We investigated what happens behind the scenes when state government grants are awarded. We found that large organizations fare well as they can use new funds to innovate or gather evidence about the value of new ventures. But many smaller organizations suffer as they do not have the person power to write grants, hire extra staff or support new activities. Restrictions on what can and can't be done with grant money can make receiving grants a burden, that is, grants fund 'icing' when what is needed is 'cake'. An inadequate mix of funding types at the community level can mean that grant schemes are pressured to fill gaps for which they were not designed. Our policy partners have responded with more community-centred grant making, better tailored to various levels of community organizational need.

A method for the inclusion of physical activity-related health benefits in cost-benefit analysis of built environment initiatives.

The built environment has a significant influence on population levels of physical activity (PA) and therefore health. However, PA-related health benefits are seldom considered in transport and urban planning (i.e. built environment interventions) cost-benefit analysis. Cost-benefit analysis implies that the benefits of any initiative are valued in monetary terms to make them commensurable with costs. This leads to the need for monetised values of the health benefits of PA. The aim of this study was to explore a method for the incorporation of monetised PA-related health benefits in cost-benefit analysis of built environment interventions. Firstly, we estimated the change in population level of PA attributable to a change in the built environment due to the intervention. Then, changes in population levels of PA were translated into monetary values. For the first step we used estimates from the literature for the association of built environment features with physical activity outcomes. For the second step we used the multi-cohort proportional multi-state life table model to predict changes in health-adjusted life years and health care costs as a function of changes in PA. Finally, we monetised health-adjusted life years using the value of a statistical life year. Future research could adapt these methods to assess the health and economic impacts of specific urban development scenarios by working in collaboration with urban planners.

Complex intervention modelling should capture the dynamics of adaptation.

BACKGROUND: Complexity has been linked to health interventions in two ways: first as a property of the intervention, and secondly as a property of the system into which the intervention is implemented. The former recognizes that interventions may consist of multiple components that act both independently and interdependently, making it difficult to identify the components or combinations of components (and their contexts) that are important mechanisms of change. The latter recognizes that interventions are implemented in complex adaptive systems comprised of intelligent agents who modify their behaviour (including any actions required to implement the intervention) in an effort to improve outcomes relative to their own perspective and objectives. Although an intervention may be intended to take a particular form, its implementation and impact within the system may deviate from its original intentions as a result of adaptation. Complexity highlights the challenge in developing interventions as effective health solutions. The UK Medical Research Council provides guidelines on the development and evaluation of complex interventions. While mathematical modelling is included in the guidelines, there is potential for mathematical modeling to play a greater role. DISCUSSION: The dynamic non-linear nature of complex adaptive systems makes mathematical modelling crucial. However, the tendency is for models of interventions to limit focus on the ecology of the system - the 'real-time' operation of the system and impacts of the intervention. These models are deficient by not modelling the way the system reacts to the intervention via agent adaptation. Complex intervention modelling needs to capture the consequences of adaptation through the inclusion of an evolutionary dynamic to describe the long-term emergent outcomes that result as agents respond to the ecological changes introduced by intervention in an effort to produce better outcomes for themselves. Mathematical approaches such as those found in economics in evolutionary game theory and mechanism design can inform the design and evaluation of health interventions. As an illustration, the introduction of a central screening clinic is modeled as an example of a health services delivery intervention. Complexity necessitates a greater role for mathematical models, especially those that capture the dynamics of human actions and interactions.

How do we fund Public Health in Australia? How should we?

OBJECTIVE: To map how public health is funded in Australia. To assess whether changes to funding methods might improve system performance. METHODS: Review of publicly accessible documents and discussions with public health key informants. RESULTS: Australia spent $140 per person on public health in 2019-20, (1.8% of total health spending). But there is considerable state and territory variation. This money flows through multiple channels and payment mechanisms. Responsibility for what is funded is largely delegated to authorities close to the problems. This makes it easier to choose the best mechanism for funding an activity. Much information is hidden from view, however. This makes it impossible to assess whether the potential for population benefit is fully realised. CONCLUSIONS: Australia avoids some of the difficulties experienced elsewhere because funding is largely devolved to states in block grants; they shape their own investments. The US, by contrast, prefers categorical funds for specific purposes. Three suggestions for making the funding system here more visible, useful and accountable are canvassed, including 'satellite accounts'. IMPLICATIONS FOR PUBLIC HEALTH: Funding needs to be more transparent before it is possible to assess whether public health system performance could be improved through changes to the way public health is funded.

Preventing postnatal depression in new mothers using telephone peer support: protocol for the DAISY (Depression and AnxIety peer Support studY) multi-centre randomised controlled trial.

INTRODUCTION: Postnatal depression affects up to one in six new mothers in Australia each year, with significant impacts on the woman and her family. Prevention strategies can be complicated by a woman's reluctance to seek professional help. Peer support is a promising but inadequately tested early intervention. Very few trials have reported on the efficacy of peer support in the perinatal period and no study has been undertaken in Australia. We will explore if proactive telephone-based peer (mother-to-mother) support, provided to women identified as being at high risk of postnatal depression, impacts on clinically significant depressive symptomatology at 6 months postpartum. METHODS AND ANALYSIS: This is a protocol for a single-blinded, multi-centre, randomised controlled trial conducted in Melbourne, Australia. Eligible women will be recruited from either the postnatal units of two maternity hospitals, or around 4 weeks postpartum at maternal and child health centres within two metropolitan council areas. A total of 1060 (530/group) women will be recruited and randomly allocated (1:1 ratio) to either-usual care, to receive the standard community postpartum services available to them, or the intervention group, to receive proactive telephone-based support from a peer volunteer for 6 months, in addition to standard community services. PRIMARY OUTCOME: clinically significant depressive symptomatology at 6 months postpartum as measured using the Edinburgh Postnatal Depression Scale. SECONDARY OUTCOMES: symptoms of anxiety and/or stress, health-related quality of life, loneliness, perception of partner support, self-rated parenting, child health and development, infant feeding and health service use. The cost-effectiveness of the intervention relative to standard care will also be assessed. ETHICS AND DISSEMINATION: Ethics approval has been obtained from La Trobe University, St. Vincent's Hospital, the Royal Women's Hospital, Northern Health, Victorian Department of Health and Human Services and Victorian Department of Education and Training. Written informed consent will be obtained from all participants before randomisation. Trial results will be disseminated through peer-reviewed publications, conference presentations and a higher degree thesis. TRIAL REGISTRATION NUMBER: ACTRN12619000684123; Australian New Zealand Clinical Trials Registry.

Assessing the cost-effectiveness of treating chronic hepatitis C virus in people who inject drugs in Australia.

BACKGROUND AND AIM: To assess the cost-effectiveness of hepatitis C virus treatment with pegylated interferon alfa-2a and ribavirin in current and former people who inject drugs (PWID). METHODS: A decision analytic model simulated the lifetime costs and outcomes of four treatment options: early treatment with mild fibrosis, standard treatment with moderate fibrosis, late treatment with compensated cirrhosis, and no treatment. Treatment modalities were simulated across current, former, and never-injector cohorts of 1000 hypothetical patients with chronic hepatitis C virus. The main outcome measures were incremental costs ($AUD) per quality-adjusted life years (QALYs) gained, and incremental cost-effectiveness ratios (ICERs) were calculated for each cohort. RESULTS: Treatment of current PWID during mild fibrosis resulted in a discounted average gain of 1.60 QALYs (95% confidence interval 0.93-2.26) for an added cost of $12,723 ($11,153-$14,396) compared with no treatment, yielding an ICER of $7941 per QALY gained ($6347-$12,017). Former PWID gained 1.80 QALYs (1.29-2.33) for $10,441 ($8843-$12,074) for early treatment compared with no treatment, resulting in an ICER of $5808 per QALY gained ($5189-$6849). Never-injectors gained 2.33 QALYs (1.87-2.80) for $9290 ($7642-$10,912) compared with no treatment-an ICER of $3985 per QALY gained ($3896-$4080). Early treatment was more cost-effective than late treatment in all cohorts. CONCLUSIONS: Despite comorbidities, increased mortality, and reduced adherence, treatment of both current and former PWID is cost-effective. Our estimates fall below the unofficial Australian cost-effectiveness threshold of $AUD 50,000 per QALY for public subsidies. Scaling up treatment for PWID can be justified on purely economic grounds.

Economic Evaluation of Early Interventions for Autistic Children: A Scoping Review.

Many autistic children access some form of early intervention, but little is known about the value for money of different programs. We completed a scoping review of full economic evaluations of early interventions for autistic children and/or their families. We identified nine studies and reviewed their methods and quality. Most studies involved behavioral interventions. Two were trial-based, and the others used various modelling methods. Clinical measures were often used to infer dependency levels and quality-adjusted life-years. No family-based or negative outcomes were included. Authors acknowledged uncertain treatment effects. We conclude that economic evaluations in this field are sparse, methods vary, and quality is sometimes poor. Economic research is needed alongside longer-term clinical trials, and outcome measurement in this population requires further exploration.

Cost-benefit analysis of a non-government organization and Australian government collaborative supported employment program for autistic people.

LAY ABSTRACT: Relative to the size of the population, there are fewer autistic people than non-autistic people in the workforce. Employment programs that provide extra support to autistic people may help them to gain and keep jobs that are suited to their skills and expertise. In this study, we reviewed the DXC Dandelion Program. This is a supported autism employment program run in partnership with the Australian Government. The program provided jobs to autistic people who worked in information and communications technology roles, such as software testing and cyber security. In this study, we examined some of the benefits of the program for the autistic people who participated in it. We also examined the benefits of the program to the government. We found that there are many savings to government when autistic people are employed in jobs that are matched to their skills and abilities, compared to being unemployed or working in jobs that are below their level of education, training, or skills.

The association between sidewalk length and walking for different purposes in established neighborhoods.

BACKGROUND: Walking in neighborhood environments is undertaken for different purposes including for transportation and leisure. We examined whether sidewalk availability was associated with participation in, and minutes of neighborhood-based walking for transportation (NWT) and recreation (NWR) after controlling for neighborhood self-selection. METHOD: Baseline survey data from respondents (n = 1813) who participated in the RESIDential Environment (RESIDE) project (Perth, Western Australia) were used. Respondents were recruited based on their plans to move to another neighborhood in the following year. Usual weekly neighborhood-based walking, residential preferences, walking attitudes, and demographics were measured. Characteristics of the respondent's baseline neighborhood were measured including transportation-related walkability and sidewalk length. A Heckman two-stage modeling approach (multivariate Probit regression for walking participation, followed by a sample selection-bias corrected OLS regression for walking minutes) estimated the relative contribution of sidewalk length to NWT and NWR. RESULTS: After adjustment, neighborhood sidewalk length and walkability were positively associated with a 2.97 and 2.16 percentage point increase in the probability of NWT participation, respectively. For each 10 km increase in sidewalk length, NWT increased by 5.38 min/wk and overall neighborhood-based walking increased by 5.26 min/wk. Neighborhood walkability was not associated with NWT or NWR minutes. Moreover, sidewalk length was not associated with NWR minutes. CONCLUSIONS: Sidewalk availability in established neighborhoods may be differentially associated with walking for different purposes. Our findings suggest that large investments in sidewalk construction alone would yield small increases in walking.

The prevention access and risk taking in young people (PARTY) project protocol: a cluster randomised controlled trial of health risk screening and motivational interviewing for young people presenting to general practice.

BACKGROUND: There are growing worldwide concerns about the ability of primary health care systems to manage the major burden of illness in young people. Over two thirds of premature adult deaths result from risks that manifest in adolescence, including injury, neuropsychiatric problems and consequences of risky behaviours. One policy response is to better reorientate primary health services towards prevention and early intervention. Currently, however, there is insufficient evidence to support this recommendation for young people. This paper describes the design and implementation of a trial testing an intervention to promote psychosocial risk screening of all young people attending general practice and to respond to identified risks using motivational interviewing. MAIN OUTCOMES: clinicians' detection of risk-taking and emotional distress, young people's intention to change and reduction of risk taking. SECONDARY OUTCOMES: pathways to care, trust in the clinician and likelihood of returning for future visits. The design of the economic and process evaluation are not detailed in this protocol. METHODS: PARTY is a cluster randomised trial recruiting 42 general practices in Victoria, Australia. Baseline measures include: youth friendly practice characteristics; practice staff's self-perceived competency in young people's care and clinicians' detection and response to risk taking behaviours and emotional distress in 14-24 year olds, attending the practice. Practices are then stratified by a social disadvantage index and billing methods and randomised. Intervention practices receive: nine hours of training and tools; feedback of their baseline data and two practice visits over six weeks. Comparison practices receive a three hour seminar in youth friendly practice only. Six weeks post-intervention, 30 consecutive young people are interviewed post-consultation from each practice and followed-up for self-reported risk taking behaviour and emotional distress three and 12 months post consultation. DISCUSSION: The PARTY trial is the first to examine the effectiveness and efficiency of a psychosocial risk screening and counselling intervention for young people attending primary care. It will provide important data on health risk profiles of young people attending general practice and on the effects of the intervention on engagement with primary care and health outcomes over 12 months. TRIAL REGISTRATION: ISRCTN16059206.

A Review of the User Fees Policy for Primary Healthcare Consultations in Botswana: Problems With Effective Planning, Implementation and Evaluation.

BACKGROUND: The Government of Botswana introduced user-fees for primary healthcare consultations in 1975. The policy has remained in place since then, although the fee has remained largely unaltered despite rising inflation. Early reviews of the policy pointed to problems in its implementation, but there has been no evaluation in the past 20 years. The aim of this study was to review the policy to assess whether documented issues with its implementation have been addressed. METHODS: This qualitative study involved interviews with 32 key informants: 18 policy-makers and 14 front-line revenue collectors. Data were analysed thematically using a template approach with constructs from an established organizational capacity assessment framework used as predetermined categories to guide data collection and analysis. RESULTS: Limited administrative and management capacity has been a major hindrance to effective implementation of the policy. The lack of infrastructure for effective revenue collection led to misappropriation of funds. Lack of clear guidelines for health facilities on how to implement the policy generated interdepartmental conflicts. Study participants believed the current policy was unlikely to be cost-effective since the cost of collecting fees probably exceeded the revenue it generated. CONCLUSION: If the Botswana Government persists with the policy then it needs to improve organizational capacity to collect and manage revenues efficiently. However, policy thinking since the turn of the century has turned away from user-charges in healthcare as they impede the move towards universal access. It is timely therefore to consider alternative financing approaches that are more effective and a more equitable means of paying for healthcare.

Efficacy of Repeating Pulmonary Rehabilitation in People with COPD: A Systematic Review.

Background: Pulmonary rehabilitation is an effective intervention for people with chronic obstructive pulmonary disease (COPD). People with COPD undertake repeat programs, but synthesis of evidence regarding such practice has not been undertaken. The aim of this systematic review was to establish the effects of repeating pulmonary rehabilitation subsequent to an initial program in people with COPD. Methods: Studies where participants with COPD undertook >1 pulmonary rehabilitation program were included, incorporating RCT (randomized controlled trial) and non-randomized studies. Electronic database searches were undertaken. Two authors independently undertook study identification, data extraction and risk of bias assessment. The primary outcome was health-related quality of life (HRQoL); secondary outcomes were exercise capacity, hospitalizations and exacerbations, adherence, mortality and adverse events. Narrative synthesis was undertaken for clinically heterogeneous trials. Data from RCTs and non-randomized studies were not combined for analysis. Results: Ten included studies (2 RCTs) involved 907 participants with COPD (n=653 had undertaken >1 program). The majority of studies were at high risk of bias. One RCT (n=33) reported no difference in HRQol after a repeat program vs usual care following exacerbation (Chronic Respiratory Disease Questionnaire dyspnea domain score MD 0.4, 95% CI -0.5 to 3). In stable patients, clinically important and statistically significant improvements in HRQoL and exercise capacity were reported after repeat programs, but of a smaller magnitude than initial programs. There was evidence for reductions in exacerbations and hospitalizations, and shorter hospital length of stay for patients who repeated a program twice in 12 months compared to those who repeated once. No data for mortality or adverse events were available. Conclusion: This systematic review provides limited evidence for benefits of repeating pulmonary rehabilitation in people with COPD, including improved HRQoL and exercise capacity, and reduced hospitalizations. However, most studies have high risk of bias, which reduces the certainty of these conclusions. Study Registration: PROSPERO (CRD42020215093).

In search of causality: a systematic review of the relationship between the built environment and physical activity among adults.

BACKGROUND: Empirical evidence suggests that an association between the built environment and physical activity exists. This evidence is mostly derived from cross-sectional studies that do not account for other causal explanations such as neighborhood self-selection. Experimental and quasi-experimental designs can be used to isolate the effect of the built environment on physical activity, but in their absence, statistical techniques that adjust for neighborhood self-selection can be used with cross-sectional data. Previous reviews examining the built environment-physical activity relationship have not differentiated among findings based on study design. To deal with self-selection, we synthesized evidence regarding the relationship between objective measures of the built environment and physical activity by including in our review: 1) cross-sectional studies that adjust for neighborhood self-selection and 2) quasi-experiments. METHOD: In September 2010, we searched for English-language studies on built environments and physical activity from all available years in health, leisure, transportation, social sciences, and geographical databases. Twenty cross-sectional and 13 quasi-experimental studies published between 1996 and 2010 were included in the review. RESULTS: Most associations between the built environment and physical activity were in the expected direction or null. Land use mix, connectivity and population density and overall neighborhood design were however, important determinants of physical activity. The built environment was more likely to be associated with transportation walking compared with other types of physical activity including recreational walking. Three studies found an attenuation in associations between built environment characteristics and physical activity after accounting for neighborhood self-selection. CONCLUSION: More quasi-experiments that examine a broader range of environmental attributes in relation to context-specific physical activity and that measure changes in the built environment, neighborhood preferences and their effect on physical activity are needed.

A systematic review of health economic evaluations in orthotics and prosthetics: Part 1 - prosthetics.

BACKGROUND: The extent to which current prosthetic health economic evaluations inform healthcare policy and investment decisions is unclear. To further the knowledge in this area, existing evidence gaps and method design issues must be identified, thereby informing the design of future research. OBJECTIVES: The aim of this systematic review was to identify evidence gaps, critical method design and reporting issues and determine the extent to which the literature informs a wide range of policy and investment decisions. STUDY DESIGN: Systematic review. METHODS: A range of databases were searched using intervention- and health economic evaluation-related terms. Issues with methodological design and reporting were evaluated using the Consolidated Health Economic Checklist - Extended and the Checklist for Health Economic Evaluation Reporting Standards. RESULTS: The existing health economic evaluation literature was narrowly focused on informing within-participant component decisions. There were common method design (e.g. time horizon too short) and reporting issues (e.g. competing intervention descriptions) that limit the extent to which this literature can inform policy and investment decisions. CONCLUSION: There are opportunities to conduct a wider variety of health economic evaluations to support within- and across-sector policy and investment decisions. Changes to aspects of the method design and reporting are encouraged for future research in order to improve the rigour of the health economic evaluation evidence. CLINICAL RELEVANCE: This systematic review will inform the clinical focus and method design of future prosthetic health economic evaluations. It will also guide readers and policy-makers in their interpretation of the current literature and their understanding of the extent to which the current literature can be used to inform policy and investment decisions.

A systematic review of health economic evaluation in orthotics and prosthetics: Part 2-orthotics.

BACKGROUND: Health economic evaluations (HEEs) in orthotics are in their infancy. Identification of evidence gaps and method design issues will inform the design of future HEEs that advance knowledge and contributes to policy and investment decisions. OBJECTIVES: The aim of this systematic review was to critically appraise the existing orthotic/prosthetic health economic evaluation literature and therefore determine evidence gaps, critical method design issues, and the extent to which the literature informs orthotic policy and investment decisions. STUDY DESIGN: Systematic review. METHODS: A range of databases were searched using intervention- and HEE-related terms. The Consolidated Health Economic Checklist-Extended and the Checklist for Health Economic Evaluation Reporting Standards were used to identify issues with method design and reporting. RESULTS: Nine orthotic HEEs were narrowly focused on the cost-effectiveness of low-cost orthotic devices (eg, ankle orthoses for ankle sprains). Method design (eg, cost identification and valuation) and reporting issues (eg, lack of detail about the study population) limited the extent to which this literature can inform policy and investment decisions. CONCLUSIONS: HEEs comparing a wider variety of interventions are required, particularly for commonly used orthoses (eg, ankle-foot orthoses) and clinical presentations (eg, post-stroke). There are opportunities to strengthen future orthotic HEEs by adopting method design features (eg, microcosting and sensitivity analyses) as recommended by HEE appraisal and reporting tools.

Early intervention for young children with autism spectrum disorder: protocol for a scoping review of economic evaluations.

BACKGROUND: In many countries, children who are diagnosed with autism during the first 5 years of life are offered a range of early intervention options. These options vary considerably in the theoretical approaches and techniques applied, their intensity and duration, settings, the person/s delivering supports and the training they require. Early interventions are a significant contributor to total autism-related costs in Western countries, but only in the last 10-20 years has there been adequate outcome data to enable the comparison of different interventions' cost-effectiveness. This protocol describes a scoping review to better understand what economic evaluations have been completed in this field, and the methods used to date. METHODS: We will systematically search the following databases from their inception to 2021 for eligible studies: MEDLINE, EMBASE, PsycINFO, Econlit, PEDE, NHS EED and HTA. Full economic evaluations of any types of early intervention for children with autism prior to school entry will be included. Two reviewers will screen the studies, extract the data and assess the study quality using established checklists. The risk of bias will be assessed using the extended CHEC-list for all studies and, additionally, the Philips checklist for modelled studies. Quality of reporting will be assessed using the CHEERS checklist. A narrative synthesis will be completed to collate the findings, describe the methods used and identify which interventions have been researched from an economic perspective. DISCUSSION: This review will provide researchers, policymakers and service providers with current information about the economic evidence for early interventions for young children with autism and point to priorities for further research. It will inform future economic evaluations by highlighting the gaps or inconsistencies in the methods used to date. Limitations of the review will be acknowledged and discussed. SYSTEMATIC REVIEW REGISTRATION: Open Science Framework:  https://osf.io/sj7kt.