Decision-analytic modelling

  • 文章类型: Journal Article
    A global plan has been set to end human deaths from dog-mediated rabies by 2030 (\"Zero-by-30\"), but whether it could be achieved in some countries, such as China, remains unclear. Although elimination strategies through post-exposure prophylaxis (PEP) use, dog vaccination, and patient risk assessments with integrated bite case management (IBCM) were proposed to be cost-effective, evidence is still lacking in China. We aim to evaluate the future burdens of dog-mediated human rabies deaths in the next decade and provide quantitative evidence on the cost-effectiveness of different rabies-control strategies in China.
    Based on data from China\'s national human rabies surveillance system, we used decision-analytic modelling to estimate dog-mediated human rabies death trends in China till 2035. We simulated and compared the expected consequences and costs of different combination strategies of the status quo, improved access to PEP, mass dog vaccination, and use of IBCM.
    The predicted human rabies deaths in 2030 in China will be 308 (95%UI: 214-411) and remain stable in the next decade under the status quo. The strategy of improved PEP access alone could only decrease deaths to 212 (95%UI: 147-284) in 2028, remaining unchanged till 2035. In contrast, scaling up dog vaccination to coverage of 70% could eliminate rabies deaths by 2033 and prevent approximately 3,265 (95%UI: 2,477-3,687) extra deaths compared to the status quo during 2024-2035. Moreover, with the addition of IBCM, the \"One Health\" approach through mass dog vaccination could avoid unnecessary PEP use and substantially reduce total cost from 12.53 (95%UI: 11.71-13.34) to 8.73 (95%UI: 8.09-9.85) billion US dollars. Even if increasing the total costs of IBCM from 100 thousand to 652.10 million US dollars during 2024-2035, the combined strategy of mass dog vaccination and use of IBCM will still dominate, suggesting the robustness of our results.
    The combined strategy of mass dog vaccination and IBCM requires collaboration between health and livestock/veterinary sectors, and it could eliminate Chinese rabies deaths as early as 2033, with more deaths averted and less cost, indicating that adding IBCM could reduce unnecessary use of PEP and make the \"One Health\" rabies-control strategy most cost-effective.
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  • 文章类型: Journal Article
    背景:当智力残疾的人变老时,国际上出现的证据表明,这一特定的老龄化人口的健康需求基本上未得到满足。一些国家已经实施了健康检查,以解决这些健康不平等问题。由于测量生活质量结果的挑战,评估的重点是测量过程结果。此外,成本效益目前未知。作为针对该人群的国家指南的一部分,我们试图探索英格兰年度健康检查的可能成本效益。
    方法:使用决策分析马尔可夫模型来估计策略的成本效益,为智力残疾的老年人提供健康检查,与标准护理相比。我们采取的方法是探索性的。针对选定的一系列健康状况开发了单独的模型,具有预期的高经济影响,并且有足够的证据可用于建模。在每个模型中,假设队列从40年开始随访。年龄直到死亡。结果衡量标准是获得的每质量调整生命年成本(QALY)。计算了增量成本效益比(ICER)。从卫生提供者的角度评估了成本,并在2016年GBP表示。成本和QALY折现为3.5%。我们进行了概率敏感性分析。来自已发表研究的数据以及专家意见的参数。
    结果:健康检查导致平均QALY收益为0.074(95%CI0.072至0.119);平均增量成本为4787英镑(CI95%4773至5017)。对于每QALY30,000英镑的门槛,健康检查不划算(平均ICER£85,632;95%CI82,762至131,944)。为了使健康检查具有成本效益,干预费用需要从每年258英镑减少到100英镑以下。
    结论:虽然研究结果需要谨慎考虑,因为该模型是探索性的,因为它是基于克服证据差距的假设,他们认为,卫生系统为弱势群体提供护理的方式可能需要重新审查。这项工作是作为国家指南的一部分进行的,并为实现更平等的医疗保健规定的制度改革提供了建议。
    BACKGROUND: Whilst people with intellectual disability grow older, evidence has emerged internationally about the largely unmet health needs of this specific ageing population. Health checks have been implemented in some countries to address those health inequalities. Evaluations have focused on measuring process outcomes due to challenges measuring quality of life outcomes. In addition, the cost-effectiveness is currently unknown. As part of a national guideline for this population we sought to explore the likely cost-effectiveness of annual health checks in England.
    METHODS: Decision-analytical Markov modelling was used to estimate the cost-effectiveness of a strategy, in which health checks were provided for older people with intellectual disability, when compared with standard care. The approach we took was explorative. Individual models were developed for a selected range of health conditions, which had an expected high economic impact and for which sufficient evidence was available for the modelling. In each of the models, hypothetical cohorts were followed from 40 yrs. of age until death. The outcome measure was cost per quality-adjusted life-year (QALY) gained. Incremental cost-effectiveness ratios (ICER) were calculated. Costs were assessed from a health provider perspective and expressed in 2016 GBP. Costs and QALYs were discounted at 3.5%. We carried out probabilistic sensitivity analysis. Data from published studies as well as expert opinion informed parameters.
    RESULTS: Health checks led to a mean QALY gain of 0.074 (95% CI 0.072 to 0.119); and mean incremental costs of £4787 (CI 95% 4773 to 5017). For a threshold of £30,000 per QALY, health checks were not cost-effective (mean ICER £85,632; 95% CI 82,762 to 131,944). Costs of intervention needed to reduce from £258 to under £100 per year in order for health checks to be cost-effective.
    CONCLUSIONS: Whilst findings need to be considered with caution as the model was exploratory in that it was based on assumptions to overcome evidence gaps, they suggest that the way health systems deliver care for vulnerable populations might need to be re-examined. The work was carried out as part of a national guideline and informed recommendations about system changes to achieve more equal health care provisions.
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  • 文章类型: Journal Article
    收益时间表示对干预措施的收益何时超过成本的估计。对于具有递延收益但前期危害的干预措施,它对于利益-损害决策特别有用。这项研究的目的是扩大收益时间的应用范围,并提供一个在决策分析模型中使用的示例。
    根据估计的10年心血管风险的不同水平,三个临床相关的患者小插曲(10%,15%,20%)被开发。采用健康服务观点和生命周期的现有状态转移马尔可夫模型进行了调整,以包括与持续使用他汀类药物相关的3个直接治疗无效性(DTD)水平:0.005、0.01和0.015。对于每个小插图和DTD,我们计算了一系列输出,包括包含和不包括医疗保健成本的支付时间。
    对于10%的10年心血管风险(插图1)与低水平的DTD(0.005),不包括成本时的收益时间为8.5年,包括成本时的收益时间为16年。随着心血管疾病的基线风险增加,支付时间缩短。对于15%的心血管风险(插图2)和低水平的DTD,回报时间是5.5年和9.5年,分别。对于20%的心血管风险(插图3),回报时间为4.2年和7.2年,分别。对于每个小插图的更高水平的DTD,回报时间延长了,在某些情况下,干预从未得到回报,导致患者预期的净伤害。
    这项研究显示了如何将收益时间应用于现有的决策分析模型,并用于补充现有措施以指导医疗保健决策。
    The payoff time represents an estimate of when the benefits of an intervention outweigh the costs. It is particularly useful for benefit-harm decision making for interventions that have deferred benefits but upfront harms. The aim of this study was to expand the application of the payoff time and provide an example of its use within a decision-analytic model.
    Three clinically relevant patient vignettes based on varying levels of estimated 10-year cardiovascular risk (10%, 15%, 20%) were developed. An existing state-transition Markov model taking a health service perspective and a life-time horizon was adapted to include 3 levels of direct treatment disutility (DTD) associated with ongoing statin use: 0.005, 0.01, and 0.015. For each vignette and DTD we calculated a range of outputs including the payoff time inclusive and exclusive of healthcare costs.
    For a 10% 10-year cardiovascular risk (vignette 1) with low-levels of DTD (0.005), the payoff time was 8.5 years when costs were excluded and 16 years when costs were included. As the baseline risk of cardiovascular increased, the payoff time shortened. For a 15% cardiovascular risk (vignette 2) and for a low-level of DTD, the payoff time was 5.5 years and 9.5 years, respectively. For a 20% cardiovascular risk (vignette 3), the payoff time was 4.2 and 7.2 years, respectively. For higher levels of DTDs for each vignette, the payoff time lengthened, and in some instances the intervention never paid off, leading to an expected net harm for patients.
    This study has shown how the payoff time can be readily applied to an existing decision-analytic model and be used to complement existing measures to guide healthcare decision making.
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  • 文章类型: Journal Article
    Our aim was to adapt the traditional framework for expected net benefit of sampling (ENBS) to be more compatible with drug development trials from the pharmaceutical perspective. We modify the traditional framework for conducting ENBS and assume that the price of the drug is conditional on the trial outcomes. We use a value-based pricing (VBP) criterion to determine price conditional on trial data using Bayesian updating of cost-effectiveness (CE) model parameters. We assume that there is a threshold price below which the company would not market the new intervention. We present a case study in which a phase III trial sample size and trial duration are varied. For each trial design, we sampled 10,000 trial outcomes and estimated VBP using a CE model. The expected commercial net benefit is calculated as the expected profits minus the trial costs. A clinical trial with shorter follow-up, and larger sample size, generated the greatest expected commercial net benefit. Increasing the duration of follow-up had a modest impact on profit forecasts. Expected net benefit of sampling can be adapted to value clinical trials in the pharmaceutical industry to optimise the expected commercial net benefit. However, the analyses can be very time consuming for complex CE models.
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