Table 1. Descriptive Statistics at Baseline by Group.

Variable	Sample Summary N(% or SD)	Mandated n=82 Mean (SD)	Heavy- Drinking Voluntary n=156 Mean (SD)	F/χ2	p
Gender
Male	146 (61.9)	65 (79.3)	81 (51.9)	16.13	<.001
Female	90 (38.1)	17 (20.7)	75 (48.1)
Race
White	217 (91.9)		145 (92.9)	12.69	.05
American   Indian/Alaskan Native	3 (1.3)	3 (3.7)	0
Asian	5 (2.1)	0	5 (3.2)
Black/African American	3 (1.3)	2 (2.4)	1 (0.6)
Multiracial	5 (2.1)	2 (2.4)	3 (1.9)
Other	3 (1.3)	1 (12)	2 (1.3)
Ethnicity
Hispanic	9 (3.8)	2 (2.4)	7 (4.5)	0.65	0.34
Non-Hispanic	227 (96.2)	80 (97.6)	149 (95.5)
Dependent Variables
Average drinks per week	16.57 (10.73)	18.11 (12.40)	15.75 (9.68)	2.58	0.11
Average eBAC	0.169 (0.09)	0.163 (0.09)	0.173 (0.09)	0.59	0.45
No. HED episodesa	3.17 (2.27)	2.41 (2.07)	3.58 (2.28)	15.04	<0.001
No. peak drinksa	9.31 (4.58)	10.24 (5.17)	8.81 (4.17)	5.32	0.02
Average Weekend Drinking	12.53 (6.70)	13.55 (7.95)	11.99 (5.89)	2.93	0.09
RAPI total score	5.13 (4.29)	4.65 (5.28)	5.38 (3.67)	1.51	0.22
Defensiveness	45.35 (9.70)	44.32 (8.54)	45.90 (10.26)	1.42	0.23
Intention to Change	12.57 (4.17)	12.25 (4.57)	13.06 (3.46)	1.21	0.27
Peer Counselor Credibility	26.24 (2.40)	26.11 (2.55)	26.46 (2.14)	0.62	0.43

Note: HED=heavy episodic drinking, eBAC= Estimated Blood Alcohol Content RAPI= Rutgers Alcohol Problem Index;

^aPast month