Development of a Cannabis Assessment Tool (CAT-1) to measure current and lifetime marijuana use among older Veterans

Abstract Objective: To develop a tool to assess current (past 30 days) and lifetime marijuana use in older Veterans. Setting: US Veteran’s Affairs Healthcare System. Participants: 704 older Veterans were screened, 339 completed the initial survey, 100 completed the follow-up. Primary outcome measure: Pearson’s correlation coefficient to assess strength of association between initial and follow-up survey on measures of current and lifetime marijuana use. Results: Both a ‘gram-month’ measure of marijuana smoked in the past 30 days (r=0.83) and a