Table 19:
Cost–Utility Analysis, Sequential Approach: Internet-Delivered CBT, In-Person CBT, and Usual Care for Anxiety Disorders
| Strategy | Mean Costs, $a | Mean QALYs | Incremental Costs, $a,b | Incremental QALYsc | ICER, $/QALY Gaineda |
|---|---|---|---|---|---|
| Unguided iCBT | 269.70 | 0.802 | — | — | — |
| Usual care | 409.40 | 0.787 | 139.71 | –0.015 | Dominatedd |
| Group CBT | 1,275.37 | 0.817 | — | — | Extended dominancee |
| Guided iCBT | 1,665.17 | 0.834 | 1,395.47 | 0.032 | 43,214 |
| Individual CBT | 1,952.78 | 0.8267 | 287.61 | –0.007 | Dominatedd |
Abbreviations: CBT, cognitive behavioural therapy; iCBT, internet-delivered CBT; ICER, incremental cost-effectiveness ratio; QALY, quality-adjusted life-year.
All costs in 2018 Canadian dollars. No discounting was done because of the 12-month time horizon.
Incremental cost = average cost (strategy of guided CBT) – average cost (strategy of unguided iCBT).
Incremental effect = average effect (strategy of guided CBT) – average effect (strategy of unguided iCBT).
The negative ICER, this and usual care strategies were considered dominated.
ICER of group CBT vs. usual care: $65,070/QALY.
Note: Results may appear incorrect because of rounding.