There were no changes to the total number of records or to the other variables. Please view Table 4 in the Change History section of the codebook for more information on the new variables.

The NSDUH is the primary source of national and state-level estimates on the prevalence, patterns, and consequences of alcohol, tobacco, and illegal drug use and abuse in the general U.S. civilian non institutionalized population. The NSDUH is conducted by the Substance Abuse and Mental Health Services Administration (SAMHSA).

N-SSATS is a point-prevalence survey that provides data on substance abuse treatment facilities (both public and private) and their clients throughout the 50 States, District of Columbia, and other U.S. jurisdictions. The N-SSATS contains information on facility ownership, services offered, primary treatment focus, methadone/buprenorphine dispensing, number of clients (total and under age 18), number receiving methadone and buprenorphine, and number of beds. The geographic data included in N-SSATS are Federal Information Processing Standards (FIPS) state and county codes, metropolitan statistical area (MSA), core-based statistical area (CBSA), Census region, and Census division.

N-SSATS is conducted annually by the Substance Abuse and Mental Health Services Administration (SAMHSA). Access the 2011 N-SSATS report.