Spearman correlations were performed between P160 latency and RT for each group and were not significant (LTAA (R = 0.075, p = 0.599), NAC (R = 0.149, p = 0.319). There were no significant correlations between any drinking history or family history variables and P160 or RT within either group. Analysis of variance showed that group accounted for 21.2% of the variance of P160, but only 4.5% of the variance of RT. Using analysis of covariance, removing the variance due to the RT delay, there remained a highly significant group effect on P160 latency (F(1,98) = 23.0, p < 0.0001, Effect Size = 19.6%). In contrast, removing the variance due to the P160 latency delay, the group difference on RT no longer remained (F(1,98) = 2.6, p = 0.114, Effect Size = 2.6%). These associations between the RT and P160 latency findings were present in both males and females.
