Combining Health and Outcomes Beyond Health in Complex Evaluations of Complex Interventions: Suggestions for Economic Evaluation

In this journal there has been considerable discussion regarding the development of tools for valuing the multiple attributes that arise from complex interventions with benefits beyond health. Nevertheless, unlike the rigorous underpinnings of cost-utility analysis, much of this work has been taking place in fragmented research communities and without theoretical underpinnings, leading to a call for better and more comprehensive frameworks. We discuss the challenges faced by economic evaluation using as our example a "social prescribing" intervention, a novel health intervention based on the social model of health. We suggest a mixed-methods approach to uncover important attributes and then combine tools from health economics and economics to provide measures of benefit in a common money numeraire. This approach provides the theoretical underpinnings necessary for deliberate, transparent, and structured decision-making processes. It also enables the correct allocation of costs within complex payment systems. We suggest that, because of the complexities of randomized controlled trials, interventions should be introduced in a way that allows the application of causal analysis for evaluation. In the short term, such evaluations may be challenging and expensive. Nevertheless, as has happened with health economics evaluation and the quality-adjusted life-year, when a common set of attributes is agreed upon, the expense will fall and these methods can become embedded in interventions with diffuse outcomes.