Group membership was determined thus: Participants in the TNAD group were required to have a lifetime dosage in excess of 100 units, as well as a DSM-IV diagnosis of alcohol abuse or dependence. For these participants, we collected additional alcohol use information, including age at first intoxication and age at which regular use commenced. Participants in the NSAC group were required to have a lifetime dosage of less than 100 units, and no history of an AUD diagnosis.
