Keywords: Adolescents (13-19 years), Alcohol Abuse/Use, Drug Abuse/Use, Education / Awareness & Skill Development / Training, Grade school aged (5-12 years), Mental Health, Meta-analysis, Nutrition, Obesity, Physical Activity, Preschool aged (1-4 years), School, Sexual Health (e.g., pregnancy prevention, family planning, sexual behaviour), Smoking Cessation/Tobacco Use