Table 1. Demographic Variables and Personality Traits.
| All participants | C/C homozygotes | C/T and T/T carriers | P-values | |
|---|---|---|---|---|
| Number | 224 | 131 | 93 | |
| Age | 24.01±2.45 | 24.20±2.51 | 23.74±2.35 | 0.165 |
| Gender | 87 M/137 F | 57 M/74 F | 30 M/63 F | 0.086 |
| Handedness | 212 R/12 L | 124 R/7 L | 88 R/5 L | 0.991 |
| Nicotinea | 17 yes/207 no | 11 yes/120 no | 6 yes/87 no | 0.582 |
| Caffeinea | 54 yes/170 no | 34 yes/97 no | 20 yes/73 no | 0.440 |
| Alcohola | 0 yes/224 no | 0 yes/131 no | 0 yes/93 no | |
| BIS total | 62.20±8.44 | 62.43±7.98 | 61.88±9.08 | 0.645 |
| BIS non-planning | 23.64±4.29 | 23.64±3.94 | 23.65±4.75 | 0.990 |
| BIS congitive | 22.31±3.59 | 22.57±3.60 | 21.96±3.58 | 0.208 |
| BIS motor | 16.24±2.97 | 16.21±2.75 | 16.28±3.26 | 0.873 |
| TCI persistance | 4.70±2.14 | 4.79±2.12 | 4.57±2.17 | 0.446 |
| TCI reward dependence | 16.55±3.42 | 16.70±3.37 | 16.34±3.51 | 0.439 |
| TCI harm avoidance | 13.64±6.16 | 12.98±5.97 | 14.55±6.33 | 0.065 |
| TCI novelty | 21.32±5.76 | 21.62±5.68 | 20.90±5.89 | 0.368 |
Abbreviations: BIS, Barratt Impulsiveness Scale; F, female; L, left handed; M, male; R, right handed; TCI, Temperament and Character Inventory.
Data are presented as mean±standard deviation.
a
Nicotine, caffeine, or alcohol use during the last 2 h before fMRI.