M SD 2 3 4 5 6 7 8
1. Adolescent Age Wave 1 12.67 1.46 .30*** .30*** .48*** -.09*** .32*** .42*** -.07***
2. Adolescent Substance Use Wave 1 1.05 0.17   .42*** .31*** -.06*** .33*** .19*** -.05***
3. Adolescent Substance Use Wave 2 1.41 0.70     .68*** .30*** .80*** .50*** .12***
4. Friend Substance Use Wave 2 1.88 1.20       .28*** .70*** .63*** .08***
5. Adolescent Impulsivity Wave 2 0.38 0.22         .37*** .30*** .66***
6. Adolescent Substance Use Wave 3 1.61 0.88           .69*** .26***
7. Friend Substance Use Wave 3 2.53 1.27             .27***
8. Adolescent Impulsivity Wave 3 0.37 0.23              
* p < .05; ** p < .01; ***p < .001.
Table 1: Descriptive statistics and bivariate correlations of adolescent age, substance use, and impulsivity, and friend substance use.
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