Additionally, a pair of individuals who were thought to be an MZ twin pair is likely an DZ twin pair.As can also been seen in the table we have detected 266 pairs of individuals thought to be unrelated who are at least distally related.The majority of these pairs (264) are 3rd degree relationships (i.e., cousins). In total, there are 664 full sibling/DZ twin pairs (1328 individuals) that would be utilized for studies employing a traditional sibling pair family-based design. Based upon these relatedness measures, we have created a new variable available in the Add Health data sources called “sibclg” that specifies the biological relationship based upon the genome-wide information as presented here.This variable will be made available to Add Health researchers through the Restricted-Use Data mechanism of Add Health and will be included with other variables related to the sibling pair data.
