Table 1.
Sample characteristics for all subjects and by IC group (top panel) and sample characteristics for the stop task subsample as a whole and by IC group (bottom panel)
| Total Sample (n=117) | IC (n=70) | No-IC (n=47) | Contrasts | |
| M (SD) | M (SD) | M (SD) | ||
| Gender M:F | 98:19 | 62:8 | 36:11 | |
| % Male | 83.8% | 88.6% | 76.6% | |
| % Smokers | 13.7% | 18.6% | 6.4% | p = 0.06 |
| Age | 24.1 (3.1) | 24.3 (3.5) | 23.7 (2.3) | ns |
| Education | 15.2 (1.6) | 14.9 (1.7) | 15.5 (1.3) | ns |
| Drinks/week | 17.4 (11.7) | 20.5 (12.5) | 12.8 (8.7) | 0.001 |
| Drinks/drinking day | 5.8 (3.4) | 6.5 (3.6) | 4.8 (2.8) | 0.006 |
| AUDIT | 11.0 (5.6) | 12.9 (6.0) | 8.1 (3.3) | <0.001 |
| DSM-V count | 2.4 (2.1) | 3.4 (2.0) | 0.8 (0.9) | <0.001 |
| Eysenck I7 | 7.8 (4.1) | 8.2 (4.0) | 7.1 (4.3) | ns |
| Stop task subsample (n=40) | IC (n=18) | No-IC (n=22) | ||
| M (SD) | M (SD) | M (SD) | Contrasts | |
| Gender M:F | 23:17 | 11:7 | 12:10 | |
| % Male | 57.5% | 61.1% | 54.5% | |
| % Smokers | 5.0% | 2.5% | 2.5% | ns |
| Age | 23.3 (2.0) | 23.3 (2.2) | 23.3 (1.9) | ns |
| Education | 15.5 (1.5) | 15.2 (1.8) | 15.7 (1.1) | ns |
| Drinks/week | 14.9 (10.4) | 18.2 (13.7) | 12.1 (5.8) | ns |
| Drinks/drinking day | 5.1 (2.7) | 5.1 (2.9) | 5.1 (2.6) | ns |
| AUDIT | 8.7 (3.0) | 9.7 (3.2) | 8.0 (2.7) | ns |
| DSM-V count | 1.5 (1.1) | 2.3 (0.9) | 0.9 (0.9) | <0.001 |
| Eysenck I7 | 7.4 (4.2) | 6.8 (2.9) | 7.9 (5.0) | ns |
| SSRT | 242.7 (24.1) | 235.5 (21.3) | 248.5 (25.0) | ns |
Note. Contrasts were tested by between-groups t-tests (IC compared with no-IC). ns indicates a significance value of p > 0.05.
AUDIT = Alcohol Use Disorder Identification Test; DSM-V = Diagnostic and Statistical Manual of Mental Disorders, 5th ed; SSRT = stop signal reaction time. IC = impaired control over drinking.