In the model not controlling for T1 hyperactive–inattentive symptoms, non-Hispanic Caucasian ancestry and female gender significantly predicted higher T2 hyperactive–inattentive symptoms. No other covariates or GABRA2 predicted T2 hyperactive–inattentive symptoms. Higher impulsivity, but not sensation seeking, uniquely predicted higher T2 hyperactive–inattentive symptoms. Results were identical when controlling T1 symptoms (which was also a significant predictor).
