Table 2: Distributions of the CYP2C19 alleles, genotypes, and the predicted phenotypes.

AlleleFrequency, (%)GenotypeFrequency, (%)PhenotypeMetabolizer status

*158 (51) *17/wt1 (2)Rapid heterozygousUM
*241 (36)wt/wt12 (21)ExtensiveEM
*314 (12) *2/wt24 (42)IntermediateIM
*171 (1) *3/wt9 (16)IntermediateIM
*2/*26 (10)PoorPM
   *2/*35 (9)PoorPM

The denotations are wt: wild type; UM: ultrarapid metabolizer; EM: extensive metabolizer; IM: intermediate metabolizer; and PM: poor metabolizer.