Table 5.
Sensitivity of the estimated bladder cancer treatment cost ratio to an unmeasured Gamma confounder
| Mean0/Mean1 | Var/Meanp | Effect of confounder | Cost ratio | 95% CI |
|---|---|---|---|---|
| 1.1 | 2 | 1.05 | 0.88 | (0.80, 0.97) |
| 1.25 | 2 | 1.05 | 0.89 | (0.81, 0.98) |
| 1.5 | 2 | 1.05 | 0.91 | (0.83, 1.01) |
| 1.1 | 3 | 1.05 | 0.89 | (0.81, 0.98) |
| 1.25 | 3 | 1.05 | 0.91 | (0.82, 1.00) |
| 1.5 | 3 | 1.05 | 0.94 | (0.85, 1.03) |
| 1.1 | 2 | 1.1 | 0.89 | (0.81, 0.98) |
| 1.25 | 2 | 1.1 | 0.92 | (0.83, 1.01) |
| 1.5 | 2 | 1.1 | 0.96 | (0.87, 1.06) |
| 1.1 | 3 | 1.1 | 0.90 | (0.82, 0.99) |
| 1.25 | 3 | 1.1 | 0.95 | (0.86, 1.04) |
| 1.5 | 3 | 1.1 | 1.02 | (0.92, 1.12) |
Unadjusted cost ratio = 0.87 (95% CI 0.79–0.96).
Boldface confidence intervals denote changes from the unadjusted inference.
Mean0 = mean of unmeasured confounder in cystectomy group.
Mean1 = mean of unmeasured confounder in rad/chemo group.
Meanp = mean pooled across both groups.