Incremental Cost-Effectiveness Analyses: Cocaine Outcomesa.

Abbreviations: SI, NIDA's Standard Intervention; WWE, SI plus Well Woman Exam; 4ES, SI, WWE plus four educational sessions; ICER, incremental cost effectiveness ratio, which is the difference in cost divided by the difference in effectiveness as compared with the next least costly intervention, and indicates cost per additional outcome achieved; BL, baseline; D, dominated, which indicates that the intervention is more costly and less effective than the alternative; ED, extended dominated, which indicates that the next alternative is more costly, more effective and has a better ICER.aCosts from Ruger et al., 2010. Due to rounding, calculations may not exactly reflect data from Table 2. ICERs did not need to be adjusted because the intervention has a sufficiently long follow up time period.bPositive number indicates incremental improvement. Each value is the difference of the differences from Table 2.cNumber of occasions used cocaine, past 30 days (number of days used * times per day).dNumber of episodes used cocaine per day, past 30 days.eNumber of cocaine free days, past 30 days.fProportion of participants abstaining from cocaine, past 30 days.gProportion of participants abstaining from cocaine, past 4 months.hPast 30 days.iPer day, past 30 days.