Table 8.

Conventionally estimated main and interaction peer effects (p-value) from ROOM: self drinking in college was regressed on peer drinking in high school, own drinking in high school, and the product of the two as well as controls (not shown), each row from a separate regression model

Outcomes		Main effect	Interaction	N
Behavior in college	Own high School behavior	Roommate High School behavior	Interaction of own and roommate behaviors
Binge drinking: monthly episodes 1st fall	2.153(<.0001)	−.076(.77)	.647(.058)#	2,067
Binge drinking: monthly episodes last fall	1.70(<.0001)	−.20 (.044)	.787(.020)*	2,067
Drinking: monthly episodes 1st fall	3.35(<.0001)	.172(.603)	.792(.061)#	1,989
Drinking: monthly episodes last fall	2.83(<.0001)	−.124(.70)	1.01(.016)*	2,070

^***= p-value<.001;

^**= p-value<.01;

^*= p-value<.05;

^#=p-value<0.1.

All regression models control for ego’s and roommate’s gender, race/ethnicity, GPA, mother’s education, father’s education as well as average alcohol use in the dorm building and a set of fixed effects at the level of cells, dorms and individuals.