(1) Past-year marijuana use: Respondents were asked if they had used marijuana in the past year. (2) Among marijuana users, respondents reported on the number of days they had used marijuana in the past year (range 0-365); due to space limitations, results for this variable are presented in the Tables but not discussed. (3) Among marijuana users, respondents also reported on the number of days they had used marijuana in the past month (range 0-30). All respondents were categorized into those reporting and not reporting at least 20 days of use in the past month. This categorization, sometimes called almost daily or near daily use, is commonly reported in the NSDUH (SAMHSA, 2013, Figure 2.15) and other epidemiological studies (EMCDDA, 2012). (4) To assess marijuana abuse/dependence, respondents were classified with past-year marijuana abuse/dependence (yes/no) based on the DSM-IV criteria.
