Introduction

Results from the 2011 National Survey on Drug Use and Health: Detailed Tables is a collection of tables presenting national estimates from the National Survey on Drug Use and Health (NSDUH). These tables present information on drug, alcohol, and tobacco use, as well as drug and alcohol dependence and abuse and treatment. Measures of these behaviors and characteristics are presented by a variety of demographic, geographic, and other variables. The estimates in the tables include rates of the behaviors, numbers of persons engaging in these behaviors, and other measures.

Although the majority of these tables are trend tables presenting estimates from the 2010 and 2011 NSDUHs, some tables include only estimates from the 2011 NSDUH. Also, a number of tables contain annual averages that are generated by combining multiple years of data if sufficient data within a single year are unavailable to produce reliable estimates. These tables may provide annual averages combining data for (a) 2010 and 2011; (b) 2008 and 2009; and (c) 2008, 2009, 2010, and 2011. Also included are a number of tables that present data from earlier surveys in the series, including a section of tables mainly presenting data from 2002 to 2011 and a couple of tables within that section presenting data from 1971 to 2011.

Because of survey improvements in the 2002 NSDUH, the 2002 data constitute a new baseline for tracking trends in substance use and other measures. Therefore, estimates from the 2002 through 2011 surveys should not be compared with estimates from the 2001 or earlier surveys to examine changes over time. Methodology changes throughout NSDUH's history make it difficult to assess long-term trends from tables presenting data from 1971 to 2011. However, it is instructive to compare NSDUH estimates from 1971 to 2011 by "piecing together" the data from time periods for which data are comparable. Specifically, valid trend comparisons can be made for 1971-1998, 1999-2001, and 2002-2011. With this approach, comparisons between 1998 and 1999, and between 2001 and 2002, should be made with caution because they are potentially biased due to changes in methods. Nevertheless, when these data are combined in a single presentation, it often becomes clear that the effects of the changes in methods are small compared with the major shifts in substance use prevalence that have occurred over the past four decades.

A description of the survey measurement issues and the sample design and estimation procedures used in the 2011 NSDUH can be found in technical appendices of the Results from the 2011 National Survey on Drug Use and Health: Summary of National Findings.¹ Definitions for many of the measures and terms used in these detailed tables and in the national findings report can be located in the Key Definitions for the 2011 Detailed Tables and National Findings Report (i.e., the glossary) that is provided with these detailed tables.² Where relevant, the glossary provides cross-references between terms and specific question wording for clarity.

Tables presenting the prevalence of mental health problems, related treatment, and the co-occurrence of substance use and mental health problems will be released separately as the Results from the 2011 National Survey on Drug Use and Health: Mental Health Detailed Tables. This set of tables and a report on Results from the 2011 National Survey on Drug Use and Health: Mental Health Findings are scheduled to be made available in November 2012.

Table Revisions

During regular data collection and processing checks for the 2011 NSDUH, data errors were identified. These errors affected the data for Pennsylvania (2006-2010) and Maryland (2008-2009). Cases with erroneous data were removed from the data files, and the remaining cases were reweighted to provide representative estimates. The errors had minimal impact on the national estimates and no effect on direct estimates for the other 48 States and the District of Columbia. In reports where model-based small area estimation techniques are used, estimates for all States may be affected, even though the errors were concentrated in only two States. In reports that do not use model-based estimates, the only estimates appreciably affected are estimates for Pennsylvania, Maryland, the mid-Atlantic division, and the Northeast region. The 2011 detailed tables and 2011 national findings report do not include State-level or model-based estimates. However, they do include estimates for the mid-Atlantic division and the Northeast region. Single-year estimates based on 2006 to 2010 data and pooled 2008 and 2009 data may differ from previously published estimates. Tables and estimates based only on 2011 data are unaffected by these data errors. All impacted tables, i.e., tables with estimates based on 2006-2010 data, contain a note to indicate this to the user.

Caution is advised when comparing data from older reports with data from more recent reports that are based on corrected data files. As discussed above, comparisons of estimates for Pennsylvania, Maryland, the mid-Atlantic division, and the Northeast region are of most concern, while comparisons of national data or data for other States and regions are essentially still valid. The Center for Behavioral Health Statistics and Quality within the Substance Abuse and Mental Health Services Administration does not recommend making comparisons between unrevised 2006-2010 estimates and estimates based on 2011 data for the areas of greatest concern.

Table Numbering

The detailed tables are numbered using a three-part numbering scheme (e.g., 1.15A). The first part of the table number (1.15A) is the subject matter section to which a particular table belongs. The second part (1.15A) is the number of the table within a particular section. The third part (1.15A) is a table type indicator, an alphabetic letter appended to the table number. Each table number, as explained below, has multiple table types. Tables are numbered sequentially within each subject matter section. To the extent possible, identical tables are assigned the same table number each year except in the case where specific tables are removed or added.

The eight subject matter sections and the number of tables per section are as follows:

Section 1: Illicit Drug Use Tables - 1.1 to 1.92
Section 2: Tobacco Product and Alcohol Use Tables - 2.1 to 2.84
Section 3: Risk and Protective Factor Tables - 3.1 to 3.25
Section 4: Incidence Tables - 4.1 to 4.16
Section 5: Dependence, Abuse, and Treatment Tables - 5.1 to 5.56
Section 6: Miscellaneous Tables - 6.1 to 6.107
Section 7: Trend Tables - 7.1 to 7.45
Section 8: Sample Size and Population Tables - 8.1 to 8.13

The table type indicators are primarily defined as follows; however, some exceptions do exist and are noted in subsequent bullets.

The majority of tables within the detailed tables contain five table types (A, B, C, D, and P) as defined above. Note that table type N is used exclusively within Section 8 to display the sample size counts. Exceptions to this organization are noted as follows:

• Section 3 (Risk and Protective Factor Tables) includes tables for which only table types A, B, C, and D are produced (Tables 3.19 to 3.25). These tables present estimates for the 2011 NSDUH only; thus, these are not trend tables, so significance tests between years are not relevant and table type P is not applicable.
  
  
• Section 4 (Incidence Tables) contains both tables for which only table types A and C are produced and tables for which only table types B, D, and P are produced. Specifically, one subset of tables (Tables 4.9 to 4.12) includes table types A and C. This subset of tables presents the number of past year initiates in table type A and the associated standard errors in table type C. The remaining Section 4 tables include only table types B, D, and P. Tables 4.1 to 4.8 present numbers and percentages of past year initiates in table type B, associated standard errors for each of these estimates in table type D, and p values from tests of statistical differences between years in table type P. Tables 4.13 to 4.16 present the mean age for past year initiates in table type B, associated standard errors in table type D, and p values from tests of statistical differences between years in table type P.
  
  
• Section 5 (Dependence, Abuse, and Treatment Tables) includes tables for which only table types A, B, C, and D are produced (Tables 5.54 to 5.56). These tables present annual averages based on combined 2008-2011 NSDUH data; thus, these are not trend tables, so significance tests between years are not relevant and table type P is not applicable.
  
  
• Section 7 (Trend Tables) contains one subset of tables for which only table types B and D are produced and one subset of tables for which only table types B, D, and P are produced. Specifically, one subset of tables (Tables 7.44 and 7.45) are multiyear tables that present estimated percentages for 1971 to 2011 in table type B and associated standard errors in table type D. The estimated total number of users and associated standard errors are not presented, nor are between-year significance tests implemented; thus, table types A, C, and P are not utilized. The other subset of tables (Tables 7.38 and 7.39) are multiyear tables that include only table types B, D, and P. Tables 7.38 and 7.39 present the number of past year initiates, percentages of past year initiates, and the mean age for past year initiates in table type B, associated standard errors for each of these estimates in table type D, and p values from tests of statistical differences between years in table type P.
  
  
• Section 8 (Sample Size and Population Tables) contains only table types A, C, and N. Population counts, standard errors, and sample sizes are displayed in table types A, C, and N, respectively. Percentages of the population and associated standard error tables are not provided in this section.
  
  

Locating and Accessing a Table

The detailed tables are organized by table type into two categories:

• Prevalence Estimates and Sample Sizes - Table Types A, B, and N
• Standard Errors and P Values - Table Types C, D, and P.

Both categories are organized based on eight subject matter sections as listed below. Clicking on the subject matter section of interest takes users to a list of tables for that section. Users can scroll through the list of table titles to find the table of interest, then click on the table title to go directly to that table. Users need to return to the table of contents to access tables from other sections or categories.

The Key Definitions for the 2011 Detailed Tables and National Findings Report (i.e., the glossary) defines and cross-references key measures used in the 2011 detailed tables and the 2011 national findings report. This may be helpful when used in conjunction with the list of tables in identifying tables that contain information for selected measures. However, not all measures and terms listed in the glossary are specifically mentioned in the table index or list of tables.

The eight subject matter sections are as follows:

Section 1: Illicit Drug Use Tables
Section 2: Tobacco Product and Alcohol Use Tables
Section 3: Risk and Protective Factor Tables
Section 4: Incidence Tables
Section 5: Dependence, Abuse, and Treatment Tables
Section 6: Miscellaneous Tables
Section 7: Trend Tables
Section 8: Sample Size and Population Tables

Printing a Table

For best printing results, use the PDF-Web file of this report located at https://www.samhsa.gov/data/.

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