Sample characteristics by group status.

Abbreviations: OSU, occasional stimulant users; CS, stimulant naïve comparison subjects; THC, marijuana; Prescription Stimulants = Adderall, Ritalin (used without prescription); BIS, Barrett impulsiveness scale; SSS, sensation seeking scale, BDI, Beck depression inventory; ADHD, attention deficit hyperactivity disorder.a Verbal IQ estimated via WTAR or NAART.b Maximum number of ADHD symptoms = 21 (n = 10 attention deficit symptoms, n = 11 hyperactivity symptoms).c ADHD (age 6–13) and conduct (d refers to t-test between Low and High THC OSU.* Significance level of pSample characteristics by group status.