Table 2.

Pearson correlations between study variables separately for individual and classroom level variables

	1	2	3	4	5	6
Individual level (N = 1815)
(1) Sex	1
(2) Alcohol T2	0.06*	1
(3) Alcohol T3	0.03	0.29**	1
(4) Smoking T2	0.02	0.46**	0.22**	1
(5) Smoking T3	0.04	0.31**	0.56**	0.32**	1
(6) Impulsivity	−0.08**	0.08**	0.10**	0.10**	0.09**	1
(7) Peer pressure	0.04	0.07**	0.07**	0.08**	0.07**	0.47**
Classroom level (N = 81)	1	2
(1) Alcohol pop_norm	1
(2) Smoke pop_norm	0.72**	1
(3) Education	−0.14	−0.24*

^*p < 0.05; **p < 0.01