No (N=61)	Yes (N=376)	Overall (N=437)
Age (years)
Mean (SD)	18.1 (0.402)	18.1 (0.235)	18.1 (0.266)
Sex
Male	20 (32.8%)	135 (35.9%)	155 (35.5%)
Female	41 (67.2%)	241 (64.1%)	282 (64.5%)
Race/ethnicity
Asian	4 (6.6%)	40 (10.6%)	44 (10.1%)
Black	1 (1.6%)	15 (4.0%)	16 (3.7%)
Hispanic/Latinx	3 (4.9%)	18 (4.8%)	21 (4.8%)
White	50 (82.0%)	282 (75.0%)	332 (76.0%)
Other/Multi	3 (4.9%)	21 (5.6%)	24 (5.5%)
Pre-college drinking
Never	10 (16.4%)	109 (29.0%)	119 (27.2%)
1 to 9 occasions	24 (39.3%)	146 (38.8%)	170 (38.9%)
10+ occasions	27 (44.3%)	121 (32.2%)	148 (33.9%)
Pre-college binge drinking (times/30 days)
None	37 (60.7%)	291 (77.4%)	328 (75.1%)
1 time	11 (18.0%)	38 (10.1%)	49 (11.2%)
2 times	9 (14.8%)	25 (6.6%)	34 (7.8%)
3-5 times	2 (3.3%)	16 (4.3%)	18 (4.1%)
6-9 times	2 (3.3%)	5 (1.3%)	7 (1.6%)
10+ times	0 (0%)	1 (0.3%)	1 (0.2%)
Pre-college intention to pledge Greek life
No	31 (50.8%)	251 (66.8%)	282 (64.5%)
Yes	9 (14.8%)	38 (10.1%)	47 (10.8%)
Undecided	21 (34.4%)	87 (23.1%)	108 (24.7%)
Residence
Campus housing	59 (96.7%)	344 (91.5%)	403 (92.2%)
Other	2 (3.3%)	32 (8.5%)	34 (7.8%)
Parents' highest level of education
Bachelor's or higher	50 (82.0%)	304 (80.9%)	354 (81.0%)
Less than bachelor's	11 (18.0%)	65 (17.3%)	76 (17.4%)
Don't know	0 (0%)	7 (1.9%)	7 (1.6%)
Biological family member with clear drinking problem
No	29 (47.5%)	236 (62.8%)	265 (60.6%)
Yes	32 (52.5%)	139 (37.0%)	171 (39.1%)
Missing	0 (0%)	1 (0.3%)	1 (0.2%)
Pre-college influence of religious beliefs (0(none) to 4(extreme))
Mean (SD)	2.11 (1.24)	2.15 (1.28)	2.15 (1.27)
Missing	0 (0%)	2 (0.5%)	2 (0.5%)
Group
Experimental Early	29 (47.5%)	183 (48.7%)	212 (48.5%)
Experimental Late	32 (52.5%)	193 (51.3%)	225 (51.5%)