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. Author manuscript; available in PMC: 2020 Sep 16.
Published in final edited form as: Nat Hum Behav. 2020 Feb 3;4(5):517–530. doi: 10.1038/s41562-020-0819-8

Table 1.

Sample Characteristics

White Americana African American Hispanic American
Measure N or M(SD) N or M(SD) N or M(SD) χ2/F p
Analyzed Sample 30 28 30
Gender (fb) 15 14 15 0 1
Age 27.98 (3.97) 30.34 (7.74) 28.25 (4.64) 1.5 .23
Recruitment (IBGc) 16 11 15 1.24 .54
fMRI Sequence (MBd) 8 6 11 1.72 .42

Note: χ2 values are from Pearson’s Chi-squared tests comparing actual subject counts in each group for each measure to counts for perfectly balanced groups. F values are from linear models in R (command lm) for the ethnicity effect (coded as a three level factor) on each measure.

aWhite American = Non-Hispanic White American

bf = female, other participants in analyzed sample were male

cIBG = University of Colorado Boulder Institute for Behavioral Genetics, other recruitment source was Denver metro area Craigslist

dMB = Multiband (8 simultaneous slice acquisition, TR = .46 sec.), other fMRI sequence was standard (single slice acquisition, TR = 1.3 sec.)