Description & Citation--Study No. 21240 |
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| ICPSR Study No.: | 21240 |
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Persistent URL:
| http://dx.doi.org/10.3886/ICPSR21240 |
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| Title: | National Survey on Drug Use and Health, 2006 |
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| Principal Investigator(s): | United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration. Office of Applied Studies |
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| Series: | National Survey on Drug Use and Health (NSDUH) Series |
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| Funding Agency: | United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration. Office of Applied Studies |
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| Grant Number: | 283-2004-00022 |
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| Bibliographic Citation: | United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration. Office of Applied Studies. National Survey on Drug Use and Health, 2006 [Computer file]. ICPSR21240-v4. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2009-08-12. doi:10.3886/ICPSR21240 |
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| Summary: | The National Survey on Drug Use and Health (NSDUH) series
(formerly titled National Household Survey on Drug Abuse) primarily
measures the prevalence and correlates of drug use in the United
States. The surveys are designed to provide quarterly, as well as
annual, estimates. Information is provided on the use of illicit
drugs, alcohol, and tobacco among members of United States households
aged 12 and older. Questions included age at first use as well as
lifetime, annual, and past-month usage for the following drug classes:
marijuana, cocaine (and crack), hallucinogens, heroin, inhalants,
alcohol, tobacco, and nonmedical use of prescription drugs, including
pain relievers, tranquilizers, stimulants, and sedatives. The survey
covered substance abuse treatment history and perceived need for
treatment, and included questions from the Diagnostic and Statistical
Manual (DSM) of Mental Disorders that allow diagnostic criteria to be
applied. The survey included questions concerning treatment for both
substance abuse and mental health related disorders. Respondents were
also asked about personal and family income sources and amounts,
health care access and coverage, illegal activities and arrest record,
problems resulting from the use of drugs, and needle-sharing.
Questions introduced in previous administrations were retained in the
2006 survey, including questions asked only of respondents aged 12 to
17. These "youth experiences" items covered a variety of topics, such
as neighborhood environment, illegal activities, drug use by friends,
social support, extracurricular activities, exposure to substance
abuse prevention and education programs, and perceived adult attitudes
toward drug use and activities such as school work. Several measures
focused on prevention-related themes in this section. Also retained
were questions on mental health and access to care, perceived risk of
using drugs, perceived availability of drugs, driving and personal
behavior, and cigar smoking. Questions on the tobacco brand used most
often were introduced with the 1999 survey. Background information
includes gender, race, age, ethnicity, marital status, educational
level, job status, veteran status, and current household composition. |
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| Subject Term(s): | addiction, alcohol, alcohol abuse, alcohol consumption, amphetamines, barbiturates, cocaine, controlled drugs, crack cocaine, demographics, depression, drinking behavior, drug abuse, drug dependence, drug treatment, drug use, drugs, employment, hallucinogens, health care, heroin, households, income, inhalants, marijuana, mental health, mental health services, pain relievers, prescription drugs, pregnancy, sedatives, smoking, stimulants, substance abuse, substance abuse treatment, tobacco use, tranquilizers, youths |
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| Geographic Coverage: | United States |
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| Time Period: | 2006 |
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| Date(s) of Collection: | 2006 |
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| Unit of Observation: | individual |
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| Universe: | The civilian, noninstitutionalized population of the
United States aged 12 and older, including residents of
noninstitutional group quarters such as college dormitories, group
homes, shelters, rooming houses, and civilians dwelling on military
installations. |
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| Data Type: | survey data |
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| Data Collection Notes: | (1) Data were collected and prepared for release by
Research Triangle Institute, Research Triangle Park, North Carolina.
(2) Prior to the 2002 survey, this series was titled National
Household Surveys on Drug Abuse. (3) Survey administration and process
for this series changed in 2002. Therefore the data from 2002 and
later should not be compared with data collected in 2001 or earlier to
assess changes over time. (4) For selected variables, statistical
imputation was performed following logical inference to replace
missing responses. These variables are identified in the codebook as
"...LOGICALLY ASSIGNED" for the logical procedure, or by the
designation "IMPUTATION-REVISED" in the variable label when the
statistical procedure was also performed. The names of statistically
imputed variables begin with the letters "IR". For each
imputation-revised variable, a corresponding imputation indicator
variable indicates whether a case's value on the variable resulted
from an interview response or was imputed. Missing values for some
demographic variables were imputed by the unweighted hot-deck
technique used in previous surveys. Beginning in 1999, imputation of
missing values for many other variables was accomplished using
predictive mean neighborhoods (PMN), a new procedure developed
specifically for this survey. Both the hot-deck and PMN imputation
procedures are described in the codebook. (5) To protect the privacy
of respondents, all variables that could be used to identify
individuals have been encrypted or collapsed in the public use
file. To further ensure respondent confidentiality, the data producer
used data substitution and deletion of state identifiers and a
subsample of records in the creation of the public use file. (6)
Previously published estimates may not be exactly reproducible from
the variables in the public use file due to the disclosure protection
procedures that were implemented. (7) The setup and dictionary files
for Stata are designed to be compatible with StataSE, Version 8. This
is a large data file requiring that approximately 250 megabytes of
Random Access Memory be allocated to Stata. Operations within Stata,
including conversion of the ASCII data to Stata format, are likely to
be slow. Analysts may wish to download subsets of data from the SAMHDA
Survey Documentation and Analysis (SDA) system for use with Stata. |
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| Sample: | A multistage area probability sample for each of the 50
states and the District of Columbia was used. The 2005 NSDUH is the
first survey in a coordinated five-year sample design. Although there
is no overlap with the 1999-2004 samples, the coordinated design for
2005 through 2009 facilitated a 50 percent overlap in second-stage
units (area segments [see below]) between each two successive years
from 2005 through 2009. The 2004 NSDUH continued the 50 percent
overlap by retaining approximately half of the first-stage sampling
units from the 2003 survey. This design was intended to increase
precision of estimates in year-to-year trend analyses because of the
expected positive correlation resulting from the overlapping sample
between successive survey years. The 2006 design allows for
computation of estimates by state in all 50 states plus the District
of Columbia. States may therefore be viewed as the first level of
stratification as well as a reporting variable. Eight states, referred
to as the large sample states, had a sample designed to yield 3,600
respondents per state for the 2006 survey. This sample size was
considered adequate to support direct state estimates. The remaining
43 states (which include the District of Columbia) had a sample
designed to yield 900 respondents per state in the 2006 survey. In
these 43 states, adequate data were available to support reliable
state estimates based on SAE methodology. Within each state, sampling
strata called state sampling (SS) regions were formed. Based on a
composite size measure, states were partitioned geographically into
roughly equal-sized regions. In other words, regions were formed such
that each area yielded, in expectation, roughly the same number of
interviews during each data collection period. The eight large sample
states were divided into 48 SS regions each. The remaining states were
divided into 12 SS regions each. Therefore, the partitioning of the
United States resulted in the formation of a total of 900 SS
regions. Unlike the 1999 through 2004 surveys, the first stage of
selection for the 2005 through 2009 NSDUHs was Census tracts. The
first stage of selection began with the construction of an area sample
frame that contained one record for each Census tract in the United
States. If necessary, Census tracts were aggregated within SS regions
until each tract had, at a minimum, 150 dwelling units in urban areas
and 100 dwelling units in rural areas. These Census tracts served as
the primary sampling units (PSUs) for the coordinated five-year
sample. In advance of the survey period, specially trained listers had
visited each area segment and listed all addresses for housing units
and eligible group quarters units in a prescribed order. Systematic
sampling was used to select the allocated sample of addresses from
each segment. Each respondent who completed a full interview was given
a $30 cash payment as a token of appreciation for his or her time. To
improve the precision of the estimates, the sample allocation process
targeted five age groups: 12 to 17 years, 18 to 25 years, 26 to 34
years, 35 to 49 years, and 50 years or older. The size measures used
in selecting the area segments were coordinated with the dwelling unit
and person selection process so that a nearly self-weighting sample
could be achieved in each of the five age groups. The achieved sample
size for the 2006 survey was 67,802 persons. The public use file
contains 55,279 records due to a subsampling step used in the
disclosure protection procedures. A key step in the data processing
procedures established the minimum item response requirements in order
for cases to be retained for weighting and further analysis (i.e.,
"usable" cases). These requirements, as well as full sampling
methodology, are detailed in the codebook. |
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| Weight: | Due to various adjustments, such as those for nonresponse
and poststratification, the 2006 NSDUH sample design is not
self-weighting. Analysts are advised to use the final sample weight
when attempting to use the 2006 NSDUH data to draw inferences about
the target population or any subdomains of the target population.
All estimates published in SAMHSA reports (such as the results from
the 2006 NSDUH) are weighted using the final analysis weight for the
full sample. For the public use file, the corresponding final sample
weight is denoted as ANALWT_C, with the "C" denoting confidentiality
protection. This sample weight represents the total number of target
population persons each record on the file represents. Note that the
sum of ANALWT_C, over all records on the data file, represents an
estimate of the total number of people in the target population. |
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| Mode of Data Collection: | computer-assisted personal interview (CAPI) |
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| audio computer-assisted self interview (ACASI) |
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| Response Rates: | Strategies for ensuring high rates of participation
resulted in a weighted screening response rate of 91 percent and a
weighted interview response rate for the CAI of 74 percent. (Note that
these response rates reflect the original sample, not the subsampled
data file referenced in this document.) |
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| Note: | A list of the data formats available for this study can be found in the
summary of holdings. Detailed file-level information (such as record length, case count, and variable count) is listed in the
file manifest. |
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Some instruments administered as part of this
study may contain contents from copyrighted
instruments. Reproductions of the instruments
are provided solely as documentation for
the analysis of the data associated with this
collection. Please contact the data producers for
information on permissions to use the instruments
for other purposes.
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| 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. |
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| Original ICPSR Release: | 2007-11-20 |
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| Version History: | The last update of this study occurred on 2009-08-12. |
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| 2009-08-12 - Added the Screening Application Specifications to the available documentation. |
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| 2008-01-09 - A rounding error was corrected on one case
for the variable COLDYR2. |
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| 2007-12-10 - A correction was made to the pdf
codebook on page i-4 within the paragraph that deals with how to
create an adjusted weight when combining multiple years of the NSDUH
study. |
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| 2007-12-03 - The variable LANGVER was added which had
been left off of the original file. The codebook was updated to
include this variable and to make a minor change to one of the
subheadings on the table of contents page and for the heading within
that section. An error in the width for the variable QUESTID2 was
corrected. The width was increased by one resulting in the LRECL to
also be increased by one. Also, the summary description for the study
was updated. |
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| Dataset(s): | - DS1: National Survey on Drug Use and Health, 2006
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