Table 2. Sample Characteristics.
| Characteristics | Observations, No. (%) (Nā=ā2240) | Score, mean (SD) |
|---|---|---|
| Sex | ||
| Female | 1110 (49.6) | NA |
| Male | 1130 (50.4) | NA |
| Family history (cluster with familial risk), No./total No. (%) | 1187/2235 (53.0) | NA |
| Baseline assessments (14 y) | ||
| MID: Outcome phase (ventral striatal activation) | 1892 (84.5) | ā0.24 (1.12) |
| MID: Anticipation phase (ventral striatal activation) | 1942 (86.7) | 0.22 (0.34) |
| MID: Anticipation phase (ventromedial prefrontal cortex activation) | 1942 (86.7) | 0.03 (0.62) |
| Parental socioeconomic status | 2240 (100.0) | 17.74 (3.86) |
| LEQ: sexuality domain (frequency score) | 2240 (100.0) | 0.29 (0.18) |
| LEQ: family domain (frequency score) | 2240 (100.0) | 0.26 (0.22) |
| Impulsivity | 2206 (98.5) | 26.79 (4.86) |
| Extraversion | 2240 (100.0) | 2.50 (0.46) |
| Risk taking | 2240 (100.0) | 0.55 (0.13) |
| Alcohol misuse (AUDIT) | 2209 (98.6) | 1.50 (2.67) |
| Follow-up | ||
| 1: AUDIT, 16 y | 1698 (75.8) | 3.72 (3.48) |
| 2: AUDIT, 19 y | 1511 (67.5) | 5.64 (4.19) |
| 3: AUDIT, 22 y | 1359 (60.7) | 6.12 (4.64) |
Abbreviations: AUDIT, Alcohol Use Disorder Identification Test; LEQ, live events questionnaire; MID, monetary incentive delay; NA, not applicable.