Table 2. Descriptive Statistics for the Characteristics of the Studies, Samples, and Interventions Included in the Meta-analysis.

	M/%	k = 9 / g = 10	r
*Study characteristics*^a
Publication year (Mdn)	2008	9	0.33
Publication type (%) (1 = journal article; 0 = other)	80	9	-0.16
Region of the sample (%)		9
Midwest	33
South	33
West	33
Type of institution (%)		8
Private (1=yes)	13		0.61
4 year	100		-
Size of institution (%) (0 = Small; 1 = Medium; 2 = Large)		9	-0.54
Small	11
Medium	22
Large	67
*Research design and implementation*
Randomized controlled trial (%)^a	100	9	-
Randomization prior to approaching participants^a	78	9	-0.34
Post-randomization attrition (%)^b	47	10	-0.37
ITT analysis (%)^a	56	9	0.06
CONSORT flow diagram included (%)^a	22	9	0.34
Baseline data collected^b	20	10	0.34
Comparison type (1 = no treatment; 0 = other)	70	10	0.73^*
*Sample characteristics (intervention groups)*^b
% Male	41	10	0.03
% Greek-affiliated organization	17	2	-
% White	75	8	-0.07
% Black	11	5	-0.67
% Hispanic	11	2	-
Level of alcohol severity (%)		7	-0.16
Low-experimenters	14
Medium-regular users	71
Hazardous users	14
*Intervention characteristics*^b
Intervention components (%)		10
Advice	20		-0.21
Feedback	20		0.34
Norm referencing	80		-0.06
Education/information	50		-0.04
Campus/proximal feedback	40		0.04
Information about negative consequences	40		-0.05
BAC information/feedback	10		0.17
Delivered in print via mail (vs. electronic) %	80		-0.34
Time of intervention delivery (Mean days prior to birthday)	6	9	-0.56

Notes. k = number of studies providing data; g = number of intervention groups data;

Estimates calculated at study level;

Estimates calculated at intervention group level; r = bivariate correlation between study characteristic and effect sizes for alcohol quantity outcomes; correlations not estimated when fewer than 4 studies contributed information or no variability in variable distribution.

= p< 0.05