Table 7.

The main, step-up and initiation effects of a roommate when ego considers the roommate (1) a best college friend and (2) not a best college friend, each coefficient from a separate regression model

Outcomes and Effect Type	(1) Roommate considered a best friend			(2) Roommate not considered a best friend
	Coeff	p-value	N	Coeff	p-value	N
Binge drinking: monthly episodes 1st fall
main effect	0.68	0.008**	721	0.34	0.095#	1343
step up effect	1.32	0.0007***	721	1.09	0.0006***	1343
initiation effect	0.20	0.56	721	−0.14	0.58	1343
Binge drinking: monthly episodes last fall
main effect effect	0.60	0.014*	721	0.011	0.96	1343
step up effect	1.61	<.0001***	721	0.44	0.18	1343
initiation effect	−0.17	0.59	721	−0.26	0.32	1343
Drinking: monthly episodes 1st fall
main effect	0.88	0.012*	707	0.55	0.027*	1279
step up effect	1.28	0.0045**	707	0.86	0.0063**	1279
initiation effect	0.23	0.70	707	0.042	0.92	1279
Drinking: monthly episodes last fall
main effect	0.84	0.016*	725	0.32	0.21	1342
step up effect	1.25	0.0065**	725	0.75	0.022*	1342
initiation effect	0.21	0.72	725	−0.31	0.43	1342

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

^**= p-value<.01;

^*= p-value<.05;

^#= p-value<.10.

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.