Back Epidemiologie Afrikaans وبائيات Arabic ايبيديميولوجيا ARZ Epidemiologiya Azerbaijani Epidemyolohiya BCL Эпідэміялогія Byelorussian Эпідэміялёгія BE-X-OLD Епидемиология Bulgarian রোগবিস্তার বিজ্ঞান Bengali/Bangla Epidemiologija BS
Epidemiology is the study of the health and illness of populations. The three levels of causation of health problems include individual behavioral level, individual biological level, and political-economic ecological level.