sample is approximately equally divided into those 12-17 years, 18-25 years and 26 years and older. For Colorado considering year pairings of 2003-4, 2005-6, 2007-8, 2009-10 and 2010-11, sample sizes for 12-17 year olds, 18-25 year olds and those 26 years and older, respectively, ranged from 557-656, 570-681 and 581-650. See Substance Abuse and Mental Health Services Administration (SAMHSA) publications for further details (e.g., SAMHSA, 2008, 2009, 2010a, 2011).
