Sample Design and Weighting Report for Phase II and Phase III of ADSS

摘要

The Alcohol and Drug Services Study (ADSS) of substance abuse treatment facilities was conducted in three phases. The focus of this report is to describe the sample design and weighting processes for Phase II and Phase III of the Alcohol and Drug Services Study (ADSS). The purpose of Phase I was to provide a description of the substance abuse treatment system at the facility level. The purpose of Phase II was to further describe the substance abuse treatment system at the facility level, to describe the client population, length in stay of treatment, and the process of substance abuse treatment. The purpose of Phase III was to describe the post-treatment status of clients, to assess reentry into treatment, and to examine treatment and client factors that might affect treatment outcomes. It was important to incorporate the objectives of the planned Phase III analysis into the Phase I and Phase II sample designs. There were four general studies planned for Phase III: 1. Main Study designed to assess the status of discharged clients after treatment. Clients were offered $15 to complete the interview and $10 to submit a urine sample. These main study clients also serve as the $15/$10 group for the incentive study; 2. Incentive Study designed to examine the impacts of different financial payments on response rates, response bias, and sample bias. 3. In-Treatment Methadone Client Study (ITMC) designed to follow-up a cross section sample of methadone clients in treatment on the date of the facility site visit; and 4. Comparison Study designed to compare client status for a comparison group of early dropout (EDO) clients (clients that left treatment after a single day or visit) to the status of the main study clients.