Cost-Effectiveness of an Extended-Role General Practitioner Clinic for Persistent Physical Symptoms: Results From the Multiple Symptoms Study 3 Pragmatic Randomized Controlled Trial

Objectives: This study aimed to evaluate the cost-effectiveness of an extended-role general practitioner symptoms clinic (SC), added to usual care (UC) for patients with multiple persistent physical symptoms (sometimes known as medically unexplained symptoms). Methods: This was a 52-week within-trial cost-utility analysis of a pragmatic multicenter randomized controlled trial comparing SC + UC (n = 178) with UC alone (n = 176), conducted from the primary perspective of the UK National Health Service and personal and social services (PSS). Base-case quality-adjusted life-years (QALYs) were measured using EQ-5D-5L. Missing data were imputed using multiple imputation. Cost-effectiveness results were presented as incremental cost-effectiveness ratios and incremental net monetary benefits. Uncertainty was explored using cost-effectiveness acceptability curves (using 1000 nonparametric bootstrapped samples) and sensitivity analysis (including societal costs, using SF-6D and ICECAP-A capability measure for adults outcomes to estimate QALYs and years of full capability, respectively, varying intervention costs, missing data mechanism assumptions). Results: Multiple imputation analysis showed that compared with UC alone, SC + UC was more expensive (adjusted mean cost difference: 704; 95% CI £605-£807) and more effective (adjusted mean QALY difference: 0.0447; 95% CI 0.0067-0.0826), yielding an incremental cost-effectiveness ratio of £15 765/QALY, incremental net monetary benefit of £189.22 (95% CI −£573.62 to £948.28) and a 69% probability of the SC + UC intervention arm being cost-effective at a threshold of £20 000 per QALY. Results were robust to most sensitivity analyses but sensitive to missing data assumptions (2 of the 8 scenarios investigated), SF-6D, and ICECAP_A capability measure for adults quality-of-life outcomes. Conclusions: A symptoms clinic is likely to be a potentially cost-effective treatment for patients with persistent physical symptoms.