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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: JAMA Intern Med. 2016 Mar;176(3):352–361. doi: 10.1001/jamainternmed.2015.7841

Figure. Associations between lifetime exposure to marijuana and cognitive function (CF).

Figure

Years of marijuana modeled flexibly and current marijuana users at the Year 25 visit excluded (N=392). Results are adjusted for age, race/ethnicity, sex, study site, education, cigarette smoking, alcohol, illicit drug use, cardiovascular risk factors, depression, mirror star tracing at the Year 2 visit and differential likelihood of follow up (see Methods). All test results standardized, such that a 1 unit negative deviation indicates a standard deviation worse CF than the mean. Histograms describe the distribution of marijuana-years in CARDIA participants with any exposure to marijuana by presenting the frequency of participants in each considered interval. The inverse of the Stroop score used in the present analyses to allow interpretation of worse CF with negative standardized scores for all three CF tests. RAVLT - Rey Auditory Verbal Learning Test; DSST – Digit Symbol Substitution Test.