Finger ridge-counts and a measure of inter-finger variability (S/√10) were investigated in samples of Negroes and Whites. In general, Whites have higher ridge-counts than Negroes, but none of the differences is statistically significant. S/√10 provides a better and more realistic means of distinguishing between the two racial groups.
Jantz, Richard L.
"Finger Ridge-Counts and Inter-Finger Variability in Negroes and Whites,"
4, Article 9.
Available at: https://digitalcommons.wayne.edu/humbiol/vol46/iss4/9