To identify the relative contribution of significant factors, namely TDP level and ataxia, to the prediction of mnemonic and nonmnemonic scores in ALC, we calculated a Memory composite (average of Immediate Memory and Delayed Memory scores) and an Executive Function composite (average of Attention/Working Memory and Production scores). TDP level accounted for 12.6% of the variance of the Memory composite score over and above the contribution of total lifetime alcohol, and total lifetime alcohol accounted for 24.2% of the variance over and above the contribution of TDP level. By contrast, total lifetime alcohol accounted for only 1.1% of the variance of the Executive Function composite score over and above the contribution of ataxia score, which accounted for 10.2% of the variance over and above total lifetime alcohol.
