Variables Coefficient for pretest Coefficient for posttest
Disapproval / alcohol use -0.596 (0.0027) -0.289 (0.0725)
School importance -0.037 (0.4124) -0.158 (0.0284)
Delinquency/crime 0.341 (0.0806) 0.3907 (0.0108)
Disapproval / tobacco use -0.317 (0.0670) 0.108 (0.2366)
Disapproval / marijuana use 0.025 (0.3827) -0.274 (0.0000)
Illicit drug use 0.402 (0.0000) 0.196 (0.0005)
Stress / Alcohol & drug use 0.369 (0.0601) 0.320 (0.0255)
HIV/AIDS knowledge 0.134 (0.0424) -0.065 (0.0874)
HIV/AIDS testing 0.146 (0.3579) 0.935 (0.0003)
Negative peer attitudes 0.417 (0.0000) 0.184 (0.0004)
Adjusted R-squared 0.229 0.247
Table 1: Regression results for pre- and posttests; Numbers in the parentheses indicate the p-values of the coefficients.