ALDH2 and Alzheimer disease: In addition, to study the correlation between AD comorbidity and ALDH2 polymorphisms in the BP-II, we found that in the BP-II+AD, participants carried ALDH2*1/*1 significantly had greater score on the factor 2, for the CPT inattentiveness than did those carried the ALDH2*1/*2 + *2/*2 genotypes.