Table 1.
Participant characteristics.
| Mean (SD) | Min | Max | |
|---|---|---|---|
| Participant Age | 19.8 (1.3) | 18 | 22 |
| Informant familiarity | 2.8 (0.4) | 1.5 | 3.0 |
| Number of peer informants | 1.3 (0.5) | 1 | 2 |
| Self: Extraversion | 119.5 (19.8) | 65 | 173 |
| Self: Conscientiousness | 118.3 (22.1) | 22 | 168 |
| Self: Neuroticism | 86.1 (23.7) | 34 | 169 |
| Self: Agreeableness | 118.0 (18.5) | 61 | 163 |
| Self: Openness | 125.3 (17.8) | 67 | 174 |
| Peer: Extraversion | 11.9 (2.2) | 5 | 15 |
| Peer: Conscientiousness | 12.0 (2.1) | 6 | 15 |
| Peer: Neuroticism | 8.3 (2.3) | 5 | 15 |
| Peer: Agreeableness | 12.8 (1.8) | 7 | 15 |
| Peer: Openness | 12.0 (1.9) | 6 | 15 |
| Problem Drinking (Baseline) | 5.3 (4.2) | 0 | 21 |
| Problem Drinking (Follow-up) | 4.5 (3.8) | 0 | 22 |
| Participant sex (% female) | 59% | ||
| Past or present psychiatric diagnosis | 17% | ||
| Caucasian | 47% | ||
| Asian | 33% | ||
| African American | 8% | ||
| Bi-racial or multi-racial | 7.7% | ||
| Native American | .3% | ||
| Other race/ethnicity | 4% | ||
Note: Informant familiarity was assessed by asking how well peer informants knew the participant on a 3-point scale; self-reported personality was measured with the NEO Personality Inventory Revised; peer-reported personality was measured with an informant-report measure adapted from the Dunedin Multidisciplinary Health and Development Study (Israel et al., 2014); problem drinking was measured with the Alcohol Use Disorders Identification Test; past or present psychiatric diagnosis indicates the percentage of participants with at least one past or present DSM-IV diagnosis as assessed by the electronic Mini International Neuropsychiatric Interview. Participant characteristics are presented for the 377 participants with both peer-report and fMRI data.