Consistent with expectations for a population-based sample, the parents of the twins largely fell within sub-threshold ranges of AD criterion counts (range=0-7, M=1.03, SD=1.68), with 6.2% of the parents (10.0% of fathers, 4.0% of mothers) meeting the criteria for an AD diagnosis (3 or more AD criteria endorsed in a 12 month period). Of parents meeting AD criteria, more (57%) were fathers than mothers (43%). Further, there was a significant relationship between parents’ AD criterion counts (Pearson correlation=0.32, p<0.001).
