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Genotypes and hypolactasia/lactase persistence distribution among the different ethnic groups (%).
| Genotypes | White | Brown | Black | Japanese-Brazilian | Total |
| CC (hypolactasia) | 226 (56.6) | 37 (56.9) | 40 (80.0) | 53 (100) | 356 (62.8) |
| CT | 149 (37.3) | 26 (40.0) | 8 (16.0) | 183 (32.3) | |
| TT | 24 (6.0) | 2 (3.1) | 2 (4.0) | 28 (4.9) | |
| Lactase persistence (CT and TT) |
173 (43.4) | 28 (43.1) | 10 (20)a | None a | 211 (37.2) |
| Total | 399 (100) | 65 (100) | 50 (100) | 53 (100) | 567 (100) |
a P < 0.01
