Table 3.

Correlations, means, and standard deviations for study variables, Spring semester (Time 2)

	1	2	3	4	5	6	7	8	9
1 Users Springa	–	0.07	0.12	0.13	−0.19*	0.22**b	−0.21**	0.04	0.04
2 Social Pref		–	0.20*	0.65***	0.30***	0.37***	0.25**	−0.06	0.09
3 Social Impact			–	0.53***	0.10	0.41***	0.15	0.13	0.21**
4 Popularity				–	0.25**	0.55***	0.25**	0.03	0.07
5 Ind. Centr					–	−0.12	0.87***	0.09	0.15
6 Grp. Centr						–	−0.06	−0.06	0.15
7 Ntwk Centr							–	0.01	0.04
8 Betweeness								–	0.73***
9 Bonacich									–
Mean	14.0%	−0.061	−0.030	−0.093	0.67	0.50	2.48	0.004	0.719
SD		0.999	1.001	0.926	0.28	0.24	0.54	0.006	0.733
N	156	156	156	156	151	151	151	156	156

^aSpearman correlation coefficients are reported for relationships with the dichotomous Users variables. All other values reported are Pearson correlation coefficients.

^bPreliminary analyses based on sub-samples with limited ns suggest that the relationship between use and group centrality in the spring differs for smoking and drinking, Spearman rs=.09, ns., and .23, p < .01, respectively.

^*p < .05

^**p < .01