Fig 1.

a. Demographics of sample population (n = 48) of 8 hair curl groups. Hair geometric measurements done by three assessors and grouped according to self-declared race. Significant overlap observed across groups, confirming the futility of racial hair classification. ‘African hair’ varied from curl group V to VIII. b. Demographics of sample population (n = 48) of 6 hair curl groups. Hair geometric measurements done by three assessors and grouped according to self-declared race. The 6-group classification omits the third step (counting the number of waves) and simply classifies high curvature hair groups as falling in/out of the curl meter.