Keywords: Adolescents (13-19 years), Adults (20-59 years), Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Community, Education / Awareness & Skill Development / Training, Grade school aged (5-12 years), High Risk Group (e.g., adolescent parents, elderly, homeless, substance users), Home, Mental Health, Meta-analysis, School, Social Support (e.g., counseling, case management, outreach programs) , Youth Health