included past-year cannabis abuse or dependence (APA, 2000). To understand use pattern and CUD (Wu et al., 2012), we examined frequency of CU. We calculated the mean number of days using CU in the past year and examine different levels of use, including any CU, monthly use (≥12 days/years), and weekly CU (≥52 days/years), to understand whether racial/ethnic variations in CUD were consistent with CU patterns.
