Genotype and allele frequencies by race/ethnicity
| Asian/Pacific Islander | Caucasian | Hispanic | Total | |
| GSTM1 | ||||
| Null | 56 (65) | 43 (30) | 40 (8) | 50 (103) |
| Present# | 44 (52) | 57 (39)* | 60 (12)* | 50 (103) |
| NQO1 | ||||
| CC | 40 (47) | 66 (45) | 50 (10) | 50 (102) |
| CT | 40 (47) | 31 (21) | 30 (6) | 36 (74) |
| TT | 20 (24) | 3 (2) | 20 (4) | 15 (30) |
| Alleles | ||||
| C | 60 | 82 | 65 | 67 |
| T | 40 | 18* | 35 | 33 |
| GSTP1 | ||||
| AA | 63 (74) | 51 (35) | 30 (6) | 56 (115) |
| AG | 34 (40) | 41 (28) | 45 (9) | 37 (77) |
| GG | 3 (4) | 9 (6) | 25 (5) | 7 (15) |
| Alleles | ||||
| A | 80 | 71 | 53 | 74 |
| G | 20 | 29 | 48* | 26 |
| GSTM1 null/NQO1 | ||||
| CT or TT | 64 (41) | 41 (12) | 63 (5) | 59 (58) |
| CC | 36 (23) | 59 (17) | 38 (3) | 41 (43) |
Data are presented as % or % (n). #: homozygous (2 alleles) or heterozygous (1 allele). *p<0.05 by logistic regression, with Asian/Pacific Islander as referent group.