Substance use was assessed with the Customary Drinking and Drug Use Record [16], an interview that obtains information on lifetime and past 3-month use of alcohol, marijuana, nicotine, and eight other classes of illicit drugs in addition to DSM-IV abuse and dependence criteria, hangover/withdrawal symptoms, and negative consequences associated with substance use. The Child Behavior Checklist [1] obtains reports from parents regarding child behavior concerns. This measure has shown good reliability and validity on reports of internalizing and externalizing behavior [14]. The Beck Depression Inventory [12] assessed depressive symptoms on the day of scanning. The Wechsler Adult Intelligence Scale, Third Edition (WAIS-III) Vocabulary subtest was administered by trained psychometrists to assess premorbid intellectual functioning [105]. Parental socioeconomic status was assessed with the two-factor Hollingshead scale that combines education and occupation [43]. Family history of psychiatric disorders was assessed with the Family History Assessment Module [76].
