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Distribution of C677T and A1298C genotypes by race/ethnicity1
| African-American n (%) | Caucasian n (%) | p-value2 | Combined n (%) | |
| C677T | ||||
| C/C | 114 (81) | 49 (48) | < 0.001 | 163 (67) |
| C/T | 27 (19) | 44 (43) | 71 (29) | |
| T/T | 0 | 9 (9) | 9 (4) | |
| A1298C | ||||
| A/A | 98 (69) | 37 (36) | < 0.001 | 135 (56) |
| A/C | 38 (27) | 49 (48) | 87 (36) | |
| C/C | 5 (4) | 16 (16) | 21 (8) | |
1 Only cases who were successfully genotyped for both SNPs (n = 243) are included
2 Chi-square test comparing genotype distributions between African-Americans and Caucasians
