Table 2 Genetic analysis: demographics for the four cohorts analyzed in this study.

From: The reliability and heritability of cortical folds and their genetic correlations across hemispheres

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