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The Alcohol and Drug Services Study (ADSS) was a national study of substance abuse treatment facilities and clients. The study was designed to develop estimates of the duration and costs of treatment and to describe the post-treatment status of substance abuse clients. ADSS continues and extends upon data collected in the Drug Services Research Survey, 1990: [United States] (ICPSR 3393) and the Services Research Outcome Study, 1995-1996: [United States] (ICPSR 2691) with a more complete sampling frame, an enhanced sampling design, and more detailed measures of treatment services provided, the costs of treatment, and clients in treatment. ADSS was implemented in three phases. In Phase I, a nationally representative sample of treatment facilities was surveyed to assess characteristics of treatment services and clients including treatment type, costs, program capacity, the number of clients served, waiting lists, and services provided to special populations. In Phase II, records were abstracted from a sample of clients in a subsample of Phase I facilities. This phase included four sub-components: (1) the Main Study, an analysis of abstracted records to assess the treatment process and characteristics of discharged clients, (2) the Incentive Study, which assessed the impact of varying financial payments on follow-up interview participation among non-methadone outpatient clients, (3) the In-Treatment Methadone Client study (ITMC), which assessed the treatment process of methadone maintenance, and (4) the comparison study of Early Dropout clients (EDO), which provided a proxy comparison group of records from substance abusers that went untreated. Phase III involved follow-up personal interviews with Phase II clients who could be located. This interview sought to determine post-treatment status in terms of substance use, economic condition, criminal justice involvement, and further substance abuse treatment episodes. Urine testing was conducted to validate self-reported drug use. Drugs included in the survey were alcohol, marijuana, cocaine, crack cocaine, heroin, barbiturates, benzodiazepines, amphetamines, non-prescribed use of prescription medications, abuse of over-the-counter medications, and other drugs. ADSS also included a cost study, which involved obtaining additional financial information from the Phase II facilities. A computerized desktop audit was used in the cost study to conduct consistency and accuracy checks on selected questionnaire data from Phases I and II. Variables were subsequently updated to represent the most accurate data available. Additional analysis variables were then created using combinations of the revised Phase I and II data.

The California Drug and Alcohol Treatment Assessment (CALDATA) was designed to study the costs, benefits, and effectiveness of the state's alcohol and drug treatment infrastructure (recovery services) and specifically to assess (1) the effects of treatment on participant behavior, (2) the costs of treatment, and (3) the economic value of treatment to society. Data were collected on participants (clients) across four types of treatment programs, or modalities: residential, residential "social model," nonmethadone outpatient, and outpatient methadone (detoxification and maintenance). Data were collected in two phases. In Phase 1, treatment records were abstracted for clients who received treatment or were discharged between October 1, 1991, and September 30, 1992. In Phase 2, these clients were located and recruited for a follow-up interview. The CALDATA design and procedures included elements from several national treatment outcome studies including the Drug Services Research Survey (ICPSR 3393), Services Research Outcomes Study (ICPSR 2691), National Treatment Improvement Evaluation Study (ICPSR 2884), and Drug Abuse Treatment Outcome Study (ICPSR 2258). The record abstract was designed to collect identifying and locating information for interview reference during the personal interviewing phase. The abstract also collected demographic, drug, or alcohol use, and treatment and service information. The follow-up questionnaire covered time periods before, during, and after treatment and focused on topics such as ethnic and educational background, drug and alcohol use, mental and physical health, HIV and AIDS status, drug testing, illegal activities and criminal status, living arrangements and family issues, employment and income, and treatment for drug, alcohol, and mental health problems. Drugs included alcohol, barbiturates, benzodiazepines, cocaine powder, crack, downers, hallucinogens, heroin, illegal methadone, inhalants, LSD, marijuana/hashish/THC, methamphetamines and other stimulants, narcotics, over-the-counter drugs, PCP, ritalin or preludin, and sedatives/hypnotics. CALDATA was originally known as the California Outcomes Study (COS).

The National Drug Abuse Treatment System Survey (NDATSS) is a longitudinal program of research into organizational structures, operating characteristics, and treatment modalities of outpatient drug treatment programs in the United States. This is done through interviews with program directors and clinical supervisors. In some publications, this research is referred to as the Outpatient Drug Abuse Treatment Studies (ODATS). Data being released include Wave II (1988), Wave III (1990), and Wave IV (1995).

The National Drug Abuse Treatment System Survey (NDATSS) is a longitudinal program of research into organizational structures, operating characteristics, and treatment practices of outpatient drug treatment programs in the United States. This is done through interviews with program directors and clinical supervisors. In some publications, this research is referred to as the Outpatient Drug Abuse Treatment Studies (ODATS). Data in this collection include Wave V, Wave VI, Wave VII, Wave VIII, and Wave IX. NDATSS includes four prior waves of data collection from substance abuse treatment programs surveyed in 1984, 1988, 1990, and 1995. Waves II through IV can be found at ICPSR here. Wave I is not planned for public release because it had a significantly different sample design than the other waves.