Having established the preconditions for potential mediation of the relationship between parental history of alcohol problems and current alcohol use and concomitant alcohol and tobacco use by impulsive sensation seeking, mediation was examined further. After controlling for the effects of ImpSS score, having a parental history of alcohol problems remained associated with a greater likelihood of consuming alcohol on one or two days (OR = 2.05, 95% CI = 1.59–2.64), three to nine days (OR = 1.94, 95% CI = 1.50–2.51) and 10 days or more (OR = 2.24, 95% CI = 1.63–3.07). Controlling for impulsive sensation seeking did not seem to impact the likelihood of consuming alcohol on one to two days (controlling for ImpSS: 2.05, not controlling: 2.19), three to nine days (controlling for ImpSS: 1.94, not controlling: 2.15), or 10 days or more (controlling for ImpSS: 2.24, not controlling: 2.56). Furthermore, the 95% confidence intervals for controlled and non-controlled analyses involving frequency of alcohol use overlapped, again suggesting no statistically significant differences.
