This is the Treatment Episode Data Set (TEDS) 2001 - 2011, National Admissions to Substance Abuse Treatment Services report. This report presents national-level data from TEDS for admissions in 2011 and trend data for 2001 to 2011; data elements include demographic and substance abuse characteristics of admissions to treatment aged 12 and older for abuse of alcohol and/or drugs in facilities that report to individual State administrative data systems.