Table 1.

Sample descriptive information (N = 1,489).

Variable	N (%) or M(SD)
Age at T1	18.6 (0.51)
Birth sex
Female	813 (54.6%)
Male	675 (45.4%)
Race
White	837 (57.1%)
Asian	341 (23.3%)
Black/African American	106 (7.2%)
American Indian/Alaskan Native	14 (1.0%)
Multi-racial	149 (10.2%)
Other	8 (0.5%)
Hispanic/Latino/a Ethnicity	219 (14.7%)
Intercollegiate athlete	224 (15.0%)
First generation college	243 (16.3%)
Parent education
Low	117 (8.2%)
Middle	196 (13.7%)
High	1117 (78.1%)
Substance-free floor first year	201 (13.9%)
Substance-free floor second year	40 (2.8%)
Drinks per week at T1a	4.8 (6.3)
Drinks per week at T2a	4.5 (6.0)
Drinks per week at T3a	4.4 (5.7)
Resistance to Peer Influence	2.9 (0.41)

Notes. Age at T1 was missing for participants enrolled at T2 and T3 but was collected at these later time points. Birth sex was missing for one participant; race was missing for 34 (2.3%); ethnicity was missing for one participant; socioeconomic status was missing for 59 (4.0%). Age, substance-free floor status, and drinks per week were time-varying for analyses. All other observations were measured once and used in all analyses. All tabled variables were included as control variables in analysis.

^aLog transformed for analyses.