Keywords: Adolescents (13-19 years), Adults (20-59 years), Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Clinic, Female, High Risk Group (e.g., adolescent parents, elderly, homeless, substance users), Meta-analysis, Primary health care provider office (e.g., Public health nurse, dietitian, social worker), Reproductive Health & Healthy Families, Sexual Health (e.g., pregnancy prevention, family planning, sexual behaviour)