Table 2.
Frequencies of Genetic Alleles by Smoking Status
| Gene | Current Smokers N (%) | Former Smokers N (%) | Never Smokers N (%) | Non-Smokersa N (%) | Ever Smokersb N (%) |
|---|---|---|---|---|---|
| DRD2 | |||||
| A1/A1 or A1/A2 | 62 (31%) | 65 (41%) | 172 (45%) | 237 (44%) | 127 (35%) |
| A2/A2 | 140 (69%)1, 3 | 92 (59%)1 | 209 (55%)2 | 301 (56%)3 | 232 (65%)2 |
| DRD4 | |||||
| Short (≥ 6 repeats) | 146 (73%) | 108 (70%) | 279 (73%) | 387 (73%) | 254 (72%) |
| Long (≥ 7 repeats) | 55 (27%) | 46 (30%) | 101 (27%) | 147 (27%) | 101 (29%) |
| SLC6A3 | |||||
| 9-repeat allele | 62 (30%) | 52 (33%) | 96 (25%) | 148 (27%) | 114 (31%) |
| 10-repeat allele | 142 (70%) | 108 (67%) | 290 (75%) | 398 (73%) | 250 (69%) |
Note.
a
former and never combined;
b
current and former combined;
1
comparison with matching superscript indicates p = .07;
2
comparison with matching superscript indicates p = .05;
3
comparison with matching superscript indicates p = .01.