the yes/no indicator that asks whether the participant had used sedatives and hypnotics, excluding benzodiazepines. This includes barbiturates, such as Nembutal, Pentobarbital, Seconal, Secobarbital, Butalbital, Amytal, Butisol, Phenobarbital, and Tuinal, as well as Methaqualone, Sopor, Quaalude and Chloral Hydrate as part of the Timeline Followback Method assessment, a calendar-based measure for assessing self-reported retrospective daily estimates of alcohol, tobacco and/or illicit substance use.