Table 5.
Cost-effectiveness results (incremental cost per QALY) with 6 month follow-up
| Treatment group | Cost (£)a | QALYb | ||
|---|---|---|---|---|
| Mean | 95% CI | Mean | 95% CI | |
| Intervention (n = 457) | 253·49 | 188·41, 318·57 | 0·4157 | 0·4077, 0·4238 |
| Control (n = 396) | 227·64 | 170·86, 284·43 | 0·4158 | 0·4057, 0·4260 |
| Difference (95% CI) | 25·85 | −29·89, 81·60 | −0·0000891 | −0·008, 0·008 |
| ICER | -£ 290,178 per QALY | |||
| 95% CI for ICER (from bootstrap) | -£480,012 to -£100,336 per QALY | |||
aAdjusted cost, per-participant intervention cost included in the cost of intervention group
bAdjusted QALY
Costs were estimated using generalised linear models, gamma family, log link. Decrements of QALY were estimated using generalized linear models, gamma family, log link. Arm level costs and QALYs were obtained from recycled predictions. Covariates for the models were: baseline cost and baseline utility, mean steps, age, sex, SF-8 physical and mental scores, cluster, Strata, and season. 95%CIs were obtained from 1000-iteration bootstrap
CI Confidence interval, ICER Incremental cost-effectiveness ratio, QALY Quality Adjusted Life Year, SE Standard error