Substance Use Calendar

Self-reports of substance use (marijuana, cocaine, alcohol, methamphetamine, benzodiazepenes, opioids, and other illicit drugs) will also be documented by the research assistant via the Substance Use Calendar. Similar to the Form-90, which has been shown to be a reliable and valid instrument for monitoring substance use and other outcomes in longitudinal studies (Miller & DelBoca, 1994), the Substance Use Calendar instrument assesses substance use on a daily basis and allows a flexible, continuous evaluation of substance use. It also allows for collection of data points for participants who miss evaluation sessions and thus prevents missing data and problems associated with gaps or overlap of datapoints. The use of the calendar format prompts participants to remember key dates.