| Caucasiansa | African-Americansb | ||
---|---|---|---|---|
 | N c | Frequency | N c | Frequency |
Allele | ||||
   SULT1A1*1 | 214 | 0.704 | 28 | 0.636 |
   SULT1A1*2 | 87 | 0.286 | 9 | 0.205 |
   SULT1A1*3 | 3 | 0.010 | 7 | 0.159 |
   UGT1A1*33 (TA5) | 5 | 0.015 | 7 | 0.140 |
   UGT1A1*1 (TA6) | 221 | 0.639 | 25 | 0.500 |
   UGT1A1*28 (TA7) | 120 | 0.347 | 13 | 0.260 |
   UGT1A1*34 (TA8) | 0 | 0.000 | 5 | 0.100 |
Genotype | ||||
   SULT1A1*1/*1 | 74 | 0.487 | 12 | 0.545 |
   SULT1A1*1/*2 | 66 | 0.434 | 1 | 0.045 |
   SULT1A1*1/*3 | 0 | 0.000 | 3 | 0.136 |
   SULT1A1*2/*2 | 10 | 0.066 | 2 | 0.091 |
   SULT1A1*2/*3 | 1 | 0.007 | 4 | 0.182 |
   SULT1A1*3/*3 | 1 | 0.007 | 0 | 0.000 |
   UGT1A1*33/*33 (TA5/TA5) | 2 | 0.012 | 0 | 0.000 |
   UGT1A1*33/*1 (TA5/TA6) | 1 | 0.006 | 2 | 0.080 |
   UGT1A1*33/*28 (TA5/TA7) | 0 | 0.000 | 4 | 0.160 |
   UGT1A1*33/*34 (TA5/TA8) | 0 | 0.000 | 1 | 0.040 |
   UGT1A1*1/*1 (TA6/TA6) | 67 | 0.387 | 8 | 0.320 |
   UGT1A1*1/*28 (TA6/TA7) | 86 | 0.497 | 5 | 0.200 |
   UGT1A1*1/*34 (TA6/TA8) | 0 | 0.000 | 2 | 0.080 |
   UGT1A1*28/*28 (TA7/TA7) | 17 | 0.098 | 1 | 0.040 |
   UGT1A1*28/*34 (TA7/TA8) | 0 | 0.000 | 2 | 0.080 |