Total Back Pain–Related Health Care Costs in Different Analyses
| Population | Estimated Cost, Mean (SD), £ | Mean Difference (95% CI), £ | P Value | |
|---|---|---|---|---|
| Phase 1 | Phase 3 | |||
| Intention-to-treat (N = 922) | 276.48 (585.3) | 242.94 (500.5) | −33.54 (−98.6 to 31.5) | .31 |
| Complete resource use data (N = 547) | 261.79 (362.0) | 227.90 (309.8) | −33.89 (−91.8 to 24.0) | .25 |
| Complete resource use and EQ-5D data (N = 447) | 287.29 (380.1) | 221.25 (312.5) | −66.04 (−132.2 to 0.2) | .05 |
Note: The mean difference was calculated as the phase 3 estimate minus the phase 1 estimate. Confidence intervals were generated using conventional parametric methods.