Results for base case cost-effectiveness, cost-utility and scenario (lifetime) analysis
| Presence of smoke-free policy | Absence of smoke-free policy | Difference Mean (95% CI) | Incremental cost-effectiveness ratio | |
| 1. Cost-effectiveness analysis (incremental cost per 10 µg/m3 reduction in PM2.5) | ||||
| People in custody | ||||
| Mean cost | £3075 | £3142 | −£67 | Smoke-free policy dominates |
| Mean PM2.5 (10 µg/m3) | 0.31 | 3.84 | 3.53 | |
| Operational staff | ||||
| Mean cost | £197 | £230 | −£33 | Smoke-free policy dominates |
| Mean PM2.5 (10 µg/m3) | 0.31 | 3.84 | 3.53 | |
| 2. Cost-utility analysis (incremental cost per quality-adjusted life-year) | ||||
| People in custody | ||||
| Mean cost | £3075 | £3142 | −£67 | £1241 |
| Mean QALY | 0.682 | 0.736 | −0.054 | |
| Operational staff | ||||
| Mean cost | £197 | £230 | −£33 | Smoke-free policy dominates |
| Mean QALY | 0.863 | 0.859 | 0.004 | |
| 3. Scenario (lifetime) analysis | ||||
| People in custody | ||||
| Mean cost | £22 399 | £50 838 | −£28 440 (95% CI 29 433 to −27 377) | Smoke-free policy dominates |
| Mean QALY | 21.78 | 20.81 | 0.971 (95% CI 0.533 to 1.376) | |
| Staff | ||||
| Mean cost | £12 343 | £12 803 | −£460 (95% CI −546 to −367) | Smoke-free policy dominates |
| Mean QALY | 29.82 | 29.55 | 0.262 (95% CI −0.033 to 0.544) | |
dominates—less costly and more beneficial.
PM, particulate matter; QALY, quality-adjusted life-year.