Demographic data of subjects in fMRI analysis (n = 258)
| Genotypic groups | n | Age (years) | Years of education | Gender (males/females) |
|---|---|---|---|---|
| COMT | ||||
| Val/Val | 126 | 22.9 (2.5) | 15.9 (2.1) | 55:71 |
| Met carriers | 132 | 22.7 (2.3) | 15.5 (2.2) | 62:70 |
| F (P) | 258 | 0.34 (0.56) | 1.37 (0.24) | 0.76 (0.38) |
| DRD2 | ||||
| TT | 42 | 22.7 (2.8) | 15.7 (2.1) | 16:26 |
| GT | 118 | 22.9 (2.3) | 15.8 (2.2) | 54:64 |
| GG | 98 | 22.7 (2.3) | 15.6 (2.0) | 47:51 |
| F (P) | 258 | 0.15 (0.87) | 0.04 (0.97) | 0.46 (0.63) |
| COMT × DRD2 | ||||
| Val/Val-TT | 23 | 22.7 (2.7) | 15.7 (1.9) | 7:16 |
| Val/Val-GT | 59 | 22.6 (2.5) | 15.8 (2.2) | 28:31 |
| Val/Val-GG | 44 | 23.3 (2.3) | 16.1 (2.0) | 20:24 |
| Met carriers-TT | 19 | 22.7 (3.0) | 15.7 (2.4) | 9:10 |
| Met carriers-GT | 59 | 23.1 (2.1) | 15.7 (2.3) | 26:33 |
| Met carriers-GG | 54 | 22.2 (2.2) | 15.3 (2.0) | 27:27 |
| F (P) | 258 | 3.26 (0.04) | 0.96 (0.39) | 0.65 (0.52) |