General characteristics, self-reported gastrointestinal symptoms related to dairy ingestion and lactase (LCT) C>T−13910 single nucleotide polymorphism genotype and allele frequencies in a population of Hispanic and Amerindian individuals
| Hispanics n=216 | Amerindians n=43 | p Value | |
| Women (%) | 46 | 65 | 0.02 |
| Age (years) | 50±12 | 54±15 | NS |
| N° self-reporting lactose intolerance | 44 (20.4%) | 19 (44.1%) | 0.001 |
| N° reporting diarrhoea | 15 (7%) | 16 (37.2%) | <0.001 |
| N° reporting bloating | 77 (35.6%) | 14 (32.5%) | NS |
| LCT-13910 CC genotype | 123 (56.9%) | 38 (88.3%) | <0.001 |
| LCT-13910 CT genotype | 90 (41.7%) | 5 (11.7%) | <0.001 |
| LCT-13910 TT genotype | 3 (1.4%) | 0 | NS |
| C allele frequency | 77.7% | 94.2% | <0.001 |
| T allele frequency | 22.3% | 5.8% | <0.001 |