Frequency of defined levels for the two polymorphism
| SLC6A3 3′-UTR-VNTR | n | ||
|---|---|---|---|
| COMT Val158Met | Val/Val | DAT9+ | 11 |
| DAT9– | 13 | ||
| Val/Met | DAT9+ | 24 | |
| DAT9– | 29 | ||
| Met/Met | DAT9+ | 15 | |
| DAT9– | 14 | ||
| Total | DAT9+ | 50 | |
| DAT9– | 56 |
Val/Val, homozygote valine/valine; Val/Met, heterozygote valine/methionine; Met/Met, homozygote methionine/methionine; DAT9+, carriers of the 9-repeat allele, DAT9–, noncarriers of the 9-repeat allele.