based on weighted data to account for the complex survey design, following the established methodology previously described (SAMHSA, 2010b). Within-Colorado and within our pre-specified age groups our estimates are provided for rates or numbers for the perceived risk, availability of marijuana, acceptability of marijuana use, past-year marijuana use, 20+ days of marijuana use in the past month, and past-year marijuana abuse/dependence prevalence for years 2003-4, 2005-6, 2007-8, 2009-10 and 2010-11; we compared percentages for categorical variables and averages for continuous variables between consecutive years (2003-4 vs. 2005-6); because 2009-10 and 2010-11 were non-independent, both were compared to 2007-8 to test for temporal change within Colorado.
