Table 2.

Genetic analysis: demographics for the four cohorts analyzed in this study.

Cohort	N (%F)	Race/Ethnicity/Ancestry	Age in years (mean ± stdev [range])	Relatedness
QTIM	1008 (37%)	European ancestry	22.7 ± 2.7 [18–30]	376 DZ 528 MZ 104 siblings
HCP	816 (44%)	US population with multiple racial and ethnic groups represented	29.1 ± 3.5 [22–36]	205 DZ 199 MZ and triples 412 siblings
GOBS	1205 (64%)	Mexican-American ancestry	47.1 ± 14.2 [18–97]	71 families/pedigrees
UK Biobank	10,083 (47%)	British White	62.4 ± 7.3 [45–79]	Unrelated