The young teens demonstrated another MDFT benefit: Participants were more likely to remain in treatment—an important challenge in substance use interventions. In the MDFT group, 97 percent of the participants completed treatment, compared with 72 percent of those who had CBT-based group therapy. Dr. Liddle notes that these engagement rates are far superior to the average rate of only 27 percent among those who completed 90 days of standard outpatient treatment in the NIDA-sponsored Drug Abuse Treatment Outcome Study (DATOS), a national study of adolescent drug problems.