Figure 1A.

Long-Term Cannabis Use and Neuropsychological Functions. A comparison of long-term cannabis users with 5 informative subgroups on age-45 test performance across specific neuropsychological domains. This figure shows means (and 95% CIs) on age-45 neuropsychological tests, which were adjusted for sex and childhood IQ and standardized on the full cohort (M=0, SD=1). Average normative performance is indicated by the reference line at the representative cohort mean of 0. Estimates below zero indicate poorer than average test performance. Stars indicate mean scores that were statistically significantly better (p<.05) as compared with long-term cannabis users, after adjustment for sex and childhood IQ. Rey Total=Rey Auditory Verbal Learning Test total score (learning). Rey Recall=Rey Auditory Verbal Learning Test delayed recall (memory). WMS=Wechsler Memory Scale Months Backwards test. WMI=Working Memory Index. PRI=Perceptual Reasoning Index. VCI=Verbal Comprehension Index. PSI= Processing Speed Index.