epidemiology 8 World Health 7 statistics & numerical data 6 Health surveys 4 World health 4 Health and hygiene 3 Violence 3 Wounds and Injuries 3 Wounds and injuries 3 AIDS (Disease) 2 Accidents 2 Acquired Immunodeficiency Syndrome 2 Birth control 2 Causes 2 Communicable diseases 2 Cost of Illness 2 Death 2 Demographic surveys 2 Disease Outbreaks 2 Epidemiology 2 Families 2 Fertility, Human 2 HIV Infections 2 HIV infections 2 Health Surveys 2 Primary Prevention 2 Risk Factors 2 Statistics 2 prevention & control 2 Adolescent 1