Table 3 . Comparison of CYP2C19 allele frequencies between Iranians and different populations .
| Population | Sample size | CYP2C19 Allele Frequency (%) | Reference | ||||
| 19*17 | 19*1 | 19*2 | 19*3 | Others | |||
| Iranian | 180 | 21.7 | 65.3 | 13.0 | 0 | 0 | Present study |
| Japanese | 165 | 1.3 a | 57.9 | 27.9a | 12.8 a | 0 | 1 |
| Swedish | 314 | 18.0 | NR | NR | 0 | 0 | 6 |
| Ethiopian | 190 | 18.0 | NR | NR | 0 | 0 | 6 |
| Chinese | 68 | 4.0a | NR | NR | 0 | 0 | 6 |
| Danish | 276 | 20.1 | 64.9 | 15.0 | 0 | 0 | 9 |
| Faroese | 311 | 15.4 a | 65.9 | 18.7 a | 0 | 0 | 9 |
| Norwegian | 309 | 22.0 | 62.8 | 15.2 | 0 | 0 | 9 |
| Polish | 78 | 28.2 | 56.4a | 15.4 | 0 | 0 | 10 |
| Greek | 283 | 19.61 | 67.32 | 13.07 | 0 | 0 | 21 |
| Saudi Arabian | 201 | 25.7 | 62.9 | 11.2 | 0 | 0 | 22 |
| Turkish | 244 | 24.4 | 65.6 | 10.0 | 0 | 0 | 23 |
| Korean | 150 | 0.3 a | 61.0 | 28.0 a | 11.0 a | 0 | 24 |
| Swedish | 185 | 20.0 | 64.0 | 16.0 | 0 | 0 | 24 |
| Thai | 1051 | 4.0 a | 63.0 | 27.0 a | 6 | 0 | 25 |
| Indian | 206 | 17.9 | 42.0a | 40.2 a | 0 | 0 | 26 |
| Korean | 271 | 1.5 a | 60.0 | 28.4 a | 10.1 a | 0 | 27 |
| German | 186 | 25.5 | 59.3 | 15.2 | 0 | 0 | 28 |
| Ashkenazi Jewish | 342 | 13.0 | 70.0 | 12.0 | 0 | 4.1 | 29 |
| African American | 149 | 19.0 | 63.0 | 12.0 | 0 | 4.6 | 29 |
| Hispanic | 346 | 10.0a | 75.0 | 10.0 | 0 | 1.74 | 29 |
NR: Not reported
a Represent statistically significant difference in comparison to present data (p<0.05)