This pilot study (N = 30) experimentally examined the effects of an adaptive intervention in an adult misdemeanor drug court. The adaptive algorithm adjusted the frequency of judicial status hearings and clinical case-management sessions according to pre-specified criteria in response to participants' ongoing performance in the program. Results revealed the adaptive algorithm was acceptable to both clients and staff, feasible to implement with greater than 85% fidelity, and showed promise for eliciting clinically meaningful improvements in drug abstinence and graduation rates. Estimated effect sizes ranged from 0.40 to 0.60 across various dependent measures. Compared to drug court as-usual, participants in the adaptive condition were more likely to receive responses from the drug court team for inadequate performance in the program and received those responses after a substantially shorter period of time. This suggests the adaptive algorithm may have more readily focused the drug court team's attention on poorly-performing individuals, thus allowing the team to "nip problems in the bud" before they developed too fully. These preliminary data justify additional research evaluating the effects of the adaptive algorithm in a fully powered experimental trial.Adaptive interventions adjust the dose or type of services that are administered to clients in response to clients' clinical presentation or on-going performance in treatment (e.g., Collins, Murphy & Bierman, 2004;Murphy, 2005;Murphy, Lynch, McKay, Oslin & TenHave, 2007). Matching services to clients' pre-treatment characteristics is perhaps the simplest form of adapting treatment to the needs of the individual. For example, tailoring services to the needs of youths or racial minorities is one common approach to adapting treatment for the individual. Similarly, a history of negative outcomes in prior treatment episodes might lead a program to offer a higher dosage or greater variety of services for a new client than would ordinarily be provided to new admissions. This, too, is a simple form of adapting treatment to the needs of the individual.At a more sophisticated level of adaptive programming, the nature or intensity of services is readjusted over time according to pre-specified criteria as a consequence of clients' performance in treatment. For example, if a client falls below an effective threshold for engagement in treatment-by, for example, missing a pre-specified number of counseling sessions-he or she might be re-assigned to a motivational enhancement intervention. The term matching is commonly used to describe strategies that tailor treatment to clients' baseline characteristics whereas the term adaptive is commonly used for strategies that re-adjust the Address correspondence to Douglas B. Marlowe, J.D., Ph.D., Treatment Research Institute, 600 Public Ledger Bldg., 150 South Independence Mall West, Philadelphia, PA 19106. (215) 399-0980. (215) 399-0987 (fax). dmarlowe@tresearch.org..
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