Table 1.
Summary of intervention costs, outcomes, and incremental differences over four-year follow-up
| Condition | Intervention Cost ($) | Days Abstinent | Number of Substance Use-Related Problems |
|---|---|---|---|
| OM plus RMC (N = 223) | 4,889 (52.56) [4,784; 4,993] |
1,026 (20.94) [983; 1,068] |
89 (7.29) [74.72; 104] |
| OM only (N = 223) | 2,705 (23.84) [2,640; 2,749] |
932 (25.05) [881; 983] |
126 (9.20) [107; 145] |
| Incremental Differencea | $2,184* (57.19) [2,075; 2,313] |
94* (33.18) [27.56; 160] |
37* (11.55) [13.03; 60.36] |
| ICERb | -- |
23.38 (68.37) [−46.53; 93.29] |
59.51 (84.97) [−1,791; 1,910] |
Notes: Bootstrapped means and standard errors reported (1,000 replications). Standard errors in parentheses and 95% confidence intervals in brackets.
*
p<0.001
Incremental differences may not be exact due to rounding errors. Intervention costs based on study by Dennis et al., (2011) [25] in which costs are reported in 2007 dollars.
a
The difference in cost or outcome measured between the two conditions: OM-plus-RMC vs. OM-only.
b
Incremental cost-effectiveness ratio describing the cost per day abstinent and per reduced substance-use-related problem.