Modifying NICE's Approach to Equity Weighting
This method adjusts how health benefits are valued in cost-effectiveness analyses to give more weight to treatments that help people with more severe illnesses. It does so by measuring how far a person’s expected quality-adjusted life years (QALYs) fall below a healthy standard, both in absolute and proportional terms, and using this to adjust funding decisions.
At a glance
Use when
Evaluating treatments for conditions with high disease severity, particularly in the context of NICE appraisals where equity and severity adjustments are relevant
Avoid when
When disease severity cannot be reliably quantified or when equity weighting is not part of the decision framework
Inputs
Baseline health state, expected lifetime QALYs without intervention, age at onset, life expectancy, health-related quality of life weights
Outputs
Severity-adjusted cost-effectiveness metric incorporating equity weights based on absolute and proportional QALY shortfall
How it works
A severity-based equity weighting approach that incorporates absolute and proportional QALY shortfall to inform NICE's severity modifier. Developed through modeling and analysis as part of the NICE methods review, it provides a quantitative framework for adjusting cost-effectiveness thresholds based on disease severity, influencing the final design of NICE's modified cost-effectiveness metric.
- HTA domains
- Clinical Effectiveness, Costs & Economic Evaluation, Patient and Social Aspects
- Assumptions
- Health gains are more valuable when experienced by individuals with greater disease severity; QALY shortfall reflects societal preferences for prioritizing sicker patients; linearity in disutility from shortfall can be meaningfully quantified
- Strengths
- Incorporates explicit equity considerations into decision-making,Provides a transparent, quantitative method for adjusting for severity,Informed the official NICE severity modifier, enhancing real-world applicability
- Limitations
- Depends on accurate estimation of baseline QALYs and life expectancy,May be sensitive to assumptions about proportional vs. absolute shortfall trade-offs,Limited generalizability to conditions with poorly defined natural histories
- Also known as
- Severity-based equity weighting, NICE severity modifier framework, Paulden-McCabe equity weighting method
Questions this answers
- › How can health technology assessments account for the severity of a patient's condition?
- › How should equity considerations be incorporated into cost-effectiveness analysis?
- › How does disease severity influence the value of health gains?
- › What is the rationale behind NICE's adjusted cost-effectiveness thresholds?
- › How are QALY shortfalls used to inform funding decisions?
- › What role does equity play in prioritizing access to treatments?
References & sources
Similar by meaning
- Proportional Shortfall
- Norwegian severity classes and severity-weighted cost-effectiveness thresholds (Magnussen approach)
- Methods for the Estimation of the NICE Cost-Effectiveness Threshold (Claxton supply-side threshold)
- Generalized Risk-Adjusted Cost-Effectiveness (GRACE)
- ICER Value Framework 2020 Update - Aggregation of Benefits and Contextual Considerations
Beta record. Based on the original catalogue summary; primary-source enrichment pending.