Parental alcohol problem history was assessed through the following question: “Has anyone in the family you live with ever had an alcohol problem? Check ALL that apply.” Responses were put in the following categories: biological parent, adoptive or step-parent, brother or sister, grandparent or some other family member. Given that all of the other categories allowed for family members that may not have been genetically related to the participant, students were grouped according to their response as to whether a biological parent had a history of alcohol problems. Slutske and collaborators40 found that a similar single-measure item assessing parental alcohol problems had good to excellent interrater reliability in a sample of twin pairs, and Cuijpers and Smit41 found that a very similar single item assessment of alcohol problems had strong concurrent validity with a larger measure, the FH-RDC. Finally, the ImpSS scale is a 19 question true-false scale assessing various personality characteristics and behaviors related to impulsivity and sensation seeking, and it is scored by summing the items that are consistent with impulsivity or sensation seeking. Thus, scores for this
