Table 3.

Cross-Class Comparisons Regarding Alcohol- and Drug-Related Consequences and Demographic Characteristics

	Class 1 vs. 2	Class 1 vs. 3	Class 1 vs. 4	Class 2 vs. 3	Class 2 vs. 4	Class 3 vs. 4
Age	χ2 = 10.90**	χ2 = 26.13***	χ2 = 7.56**	χ2 = 10.86**	χ2 = 167	χ2 = 2.45
Alcohol-Related Consequences	χ2 = 153.52***	χ2 = 106.78***	χ2 = 476.03***	χ2 = 4.41*	χ2 = 52.87***	χ2 = 16.38***
Drug-Related Consequences	χ2 = 62.76***	χ2 = 36.48***	χ2 = 95.35***	χ2 = 5.01*	χ2 = 9.20**	χ2 = 26.95***
Sex
Male	χ2 = 103	χ2 = 4.90*	χ2 = 103	χ2 = 107	χ2 = 0.92	χ2 = 3.26
Female	χ2 = 0.54	χ2 = 5.36*	χ2 = 2.16	χ2 = 165	χ2 = 0.71	χ2 = 0.17
Grade
7th grade	χ2 = 4.82*	χ2 = 36.66***	χ2 = 22.46***	χ2 = 8.06***	χ2 = 6.16*	χ2 = 0.07
8th grade	χ2 = 0.63	χ2 = 0.15	χ2 = 0.43	χ2 = 0.36	χ2 = 0.02	χ2 = 0.36
9th grade	χ2 = 2.60	χ2 = 103	χ2 = 0.87	χ2 = 6.22*	χ2 = 0.01	χ2 = 2.85
10th grade	χ2 = 0.57	χ2 = 5.07*	χ2 = 2.02	χ2 = 6.64*	χ2 = 2.94	χ2 = 0.46
11th grade	χ2 = 0.69	χ2 = 4.26*	χ2 = 2.96	χ2 = 145	χ2 = 126	χ2 = 0.001
12th grade	χ2 = 0.17	χ2 = 8.40**	χ2 = 0.74	χ2 = 6.09*	χ2 = 1.06	χ2 = 0.74

Note: Class 1 = no past month use, Class 2 = cigarette and marijuana use, Class 3 = cigarette, marijuana, and alcohol use, Class 4 = polysubstance use;

^*p < .05,

^**p < .01,

^***p < .001