• Prevention of suicidal ideation and suicide attempts

• Significantly reduced risk of illicit drug abuse or dependence disorder at ages 19-21

Life Skills Training, a school-based substance use prevention program:

• Significantly reduced drug and polydrug (tobacco, alcohol, and marijuana) use three years after the program

• Strongest effects when delivered with fidelity—44 percent fewer drug users; 66 percent fewer polydrug users

• Significantly reduced methamphetamine use up to 4.5 years later when combined with the Strengthening Families Program

Linking Interests of Families and Teachers, a combined family–school intervention focused on skills and communication:

• Reduced levels of aggressive behavior, less involvement with deviant peers and lower arrest rates, less use of alcohol and marijuana

• For fifth graders, continued preventive effects three years later

Fast Track, a multicomponent intervention in grades K-10:

• Reduced self-reported antisocial behavior and significantly reduced incidence of conduct disorder for children at highest initial risk

• Significantly reduced incidence of a diagnosis of attention deficit hyperactivity disorder for children at highest initial risk

Seattle Social Development Project, a combined elementary grade parent–teacher training intervention:

• Reduced diagnosable mental health disorders by age 24 and heavy alcohol use and violence by age 18

• Effects particularly strong for African Americans

Adolescent Transitions Program, a parenting intervention delivered in schools:

• Reduced rates of growth in tobacco, alcohol, and marijuana use between ages 11 and 17 and lowered likelihood of being diagnosed with a substance use disorder

• Reduced rates of arrest