To establish the association between reported age at first drink and maximum frequency of HED, two ordinal logistic regression analyses were conducted, the first using onset age reported at Time 1 and the second using onset age reported at Time 2 to predict HED. A pairwise comparison of the resulting odds ratios was then conducted to determine whether the strength of the association between age at first drink and HED varied by use of Time 1 vs. Time 2 reports.