Table 2 and supplemental figure 4 displays the proportion of ancestry shared with each of the reference populations of each individual from the Add Health sibling pairs sample. As can be seen in table 2 and supplemental figure 4A, the vast majority of individuals who self-identify as White have predominately European ancestry (CEU). Supplemental figure 4B illustrates the admixed ancestry typical of African Americans, self-identifying as Black. Self-identified Black individuals have a varying degree of African (YRI), European (CEU) and American (AMR) ancestry as can be seen in table 2. Likewise, self-identified Hispanic and Native American individuals (supplemental figures 4C and 4D) display an admixed ancestry largely comprised of American (AMR), European (CEU), African (YRI) and to a lesser extent, Chinese (CHB) and Japanese (JPT) ancestry. Finally, supplemental figure 4E includes self-identified Asians. As can also be seen in table 2 the ancestry of this subgroup is primarily of Chinese origin (CHB) but with measurable admixture of Japanese (JPT) and European (CEU).
