Table 1.
Means (SDs) of critical study characteristics for controls and COAs
| Control (n) | COA (n) | t test p value | |
|---|---|---|---|
| Males:Females | 12/8 | 12/8 | |
| Age (years) | 20.1 (1.3) | 20.2 (1.2) | 0.7 |
| IQ | 113.2 (8.0) | 110.9 (12.4) | 0.5 |
| Cigarettes per day (time of scan) | 1.5 (4.7) | 2.2 (5.0) | 0.6 |
| Drinks per week (time of scan) | 5.9 (7.2) | 5.2 (7.3) | 0.7 |
| Binge drinking days (past 6 months) | 37.9 (54.9) | 48.0 (76.0) | 0.6 |
| Max drinks in 24 h | 8.4 (8.7) | 9.3 (9.4) | 0.8 |
| Lifetime drink volume (number of drinks) | 702.5 (1067) | 788.5 (1036) | 0.8 |
| Number of never drinkers | 4 | 4 | |
| Number of alcohol problems | 3.8 (5.6) | 5.2 (5.7) | 0.4 |
| Number of drug problems | 0.3 (1.0) | 0.6 (1.1) | 0.4 |
| Freq of marijuana use (past 12 months) | 1.8 (2.9) | 2.2 (3.0) | 0.6 |
| Number of illicit drugs ever used | 1.3 (2.4) | 1.3 (1.3) | 1.0 |
| Mother/father/both (alcohol dependence) | 0/0/0 | 10/15/6 | |
| Mother/father/both (alcohol abuse) | 0/0/0 | 6/5/1 | |
| Mother/father/both (alcohol dependence or abuse) | 0/0/0 | 12/17/9 | |
| Mother/father/both (abused other drugs) | 1/2/0 | 8/9/5 | |
| Externalizing T score (age 12–14 years) | 47.8 (10.1) | 46.5 (8.9) | 0.8 |
| Internalizing T score (age 12–14 years) | 46.3 (8.8) | 47.1 (9.4) | 0.7 |