Table 1. Demographics.
| Racial Classification System | Black1 versus White2 | Black versus non-black3 | Non-white4 versus white | African descendant5 versus non-African descendant6 | African descendant or black versus non-African descendant and non-black |
|---|---|---|---|---|---|
| Black group – No. (%) | 176 (18.1) | 176 (11.4) | 750 (48.6) | 83 (5.4) | 218 (14.1) |
| White group – No. (%) | 794 (81.9) | 1368 (88.6) | 794 (51.4) | 1443 (94.6) | 1326 (85.9) |
1 Participants with typical physical features of the black race, including dark skin on clothing-covered areas, and characteristic hair texture and shape of the lips and nose; 2 Participants with white to pale pink skin color on covered areas; 3 White and brown participants together; 4 Brown and black participants together; 5 Participants with any African origin or ancestry in the family, regardless of their skin color; 6 Participants with no African origin or ancestry in the family