Table 2.

Sample Characteristics Overall and by Study Condition

Variable	Experimental condition (n = 20)	Free Drinking condition (n = 19)	Overall (N = 39)
Percent male	70%	68.4%	69.2%
Race/ethnicity
White, non-Hispanic	85%	84.2%	84.6%
White, Hispanic	5%	5.3%	5.1%
African-American, non-Hispanic	10%	0%	5.1%
American Indian	0%	5.3%	2.6%
Other	0%	5.3%	2.6%
Student status
Full-time	55%	42.1%	48.7%
Part-time	5%	5.3%	5.1%
Non-student	40%	52.6%	46.2%
Family history positive
At least 1 first-order relative	50%	33%	42.1%
At least 1 biological parent	40%	27.8%	34.2%
Alcohol use disorder diagnoses
Alcohol abuse: lifetime	60%	57.9%	59%
Alcohol abuse: current	20%	26.3%	23.1%
Alcohol dependence: lifetime	25%	36.8%	30.8%
Alcohol dependence: current	10%	26.3%	17.9%
Current smoker	40%	31.6%	35.9%
Past 30-day alcohol frequency/quantity reported at screening: mean (SD), range of responses
Frequency of any use	18.35 (5.53), 12–30	17.79 (5.71), 12–28	18.08 (5.55), 12–30
Frequency of heavy use	9.27 (4.13), 4–21	11.37 (4.86), 4–21	10.29 (4.56), 4–21
Drinks per drinking day	5.54 (2.47), 2.41–12.73	6.71 (2.67), 2.67–11.36	6.11 (2.60), 2.41–12.73
Peak quantity of alcohol use	12 (4.08), 6–20	13.32 (4.89), 6–20	12.64 (4.48), 6–20
Other self-report variables indicative of problem drinking risk assessed at screening
Scores on Part 2 of the ICS (out of a possible 40)	11.40 (6.27), 1–22	9.47 (8.06), 2–35	10.74 (7.05), 1–35
Age of onset of alcohol use	16.85 (1.95), 14–20	16.16 (2.04), 12–19	16.61 (1.94), 12–20
Number of drinks needed to experience subjective response during first 5 drinking experiences on the modified SRE	5.10 (1.69), 2.67–9.57	4.9 (1.2), 3.17–7.33	5.01 (1.46), 2.67–9.57

Note: Heavy use: 5 or more drinks in a day for me, 4 for women; ICS: Impaired Control Scale, SRE: Self-Rating of the Effects of Alcohol