substance abuse treatment,
Date of Collection:
Unit of Observation:
The civilian, noninstitutionalized population of the
United States aged 12 and older, including residents of
noninstitutional group quarters, such as college dormitories, group
homes, and shelters, as well as civilians dwelling on military
Data Collection Notes:
Data were collected by Research Triangle
Institute, Research Triangle Park, NC, and prepared for release by
National Opinion Research Center, Chicago, IL.
variables, statistical imputation was performed following logical
imputation to replace missing responses. These variables are
identified by the designation "IMPUTATION-REVISED" in the variable
label, and the names of these variables begin with the letters "IR".
For each imputation-revised variable there is a corresponding
imputation indicator variable that indicates whether a case's value on
the variable resulted from an interview response, logical imputation,
or statistical imputation. The names of imputation indicator variables
begin with the letters "II".
To protect confidentiality of respondents,
all variables that could be used to identify individuals have been
deleted from the public use file. Furthermore, some continuous
variables, including Census variables, have been categorized, and a
special code, "data suppressed for reasons of confidentiality," has
been assigned wherever necessary to prevent identification of small
geographic areas. These modifications and suppressions should not
affect analytic uses of the public use file.
For some drugs that have multiple names, questions regarding the use of that drug may be asked for each distinct name. For example, even though methamphetamine, methedrine and desoxyn are the same drug, their use was measured in three separate variables.
Multistage area probability sample design involving five
selection stages: (a) primary areas (e.g., counties), (b) subareas
within primary areas (blocks or block groups), (c) dwelling (listing)
units (housing units or group quarters) within subareas, (d) age group
domains within listing units, and (e) individuals within sampled age
groups. Each dwelling was classified by race/ethnicity based on the
head of the dwelling. The three race/ethnicity classifications were
Hispanic, non-Hispanic Black (Black), and non-Hispanic non-Black
(Whites and others). Interviewers sampled individuals after
determining age group domains for each household. The age group
selection probabilities were based on the desired sample sizes for
each age group by race/ethnicity. The probabilities of selecting a
person within an age group were based on the number of persons in the
age group in each dwelling. Six Metropolitan Statistical Areas (MSAs)
of special interest were oversampled: Washington, DC, New York, Miami,
Chicago, Denver, and Los Angeles. These MSAs were oversampled to allow
separate estimation for low socioeconomic status (SES) urbanized areas
and for all other areas of each MSA. Blacks, Hispanics, and youths
aged 12-17 were also oversampled.
Data were weighted based on the
five stages of sampling that were used. Adjustments were made to compensate for nonresponse and
sampling error. Adjustments also included trimming sample weights to
reduce excessive weight variation and a post-stratification to Census
population estimates. The final weight variable to be used in analysis is ANALWT.
personal interviews and self-reported answer sheets (drug
A completed interview had to contain, at a minimum,
data on the recency of use of marijuana, cocaine, and alcohol. The overall
response rate was 82.5 percent. The response rates for the three race/
ethnicity groups were 86 percent for Hispanics, 84.8 percent for Blacks,
and 80.1 percent for Whites and others.
Extent of Processing: ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of
disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major
statistical software formats as well as standard codebooks to accompany the data. In addition to
these procedures, ICPSR performed the following processing steps for this data collection:
Performed consistency checks.
Standardized missing values.
Created online analysis version with question text.
Checked for undocumented or out-of-range codes.
Restrictions: Users are reminded by the United States Department of Health and Human Services that these data are to be used solely for statistical analysis and reporting of aggregated information and not for the investigation of specific individuals or treatment facilities.