|Epidemiology is the branch of medical science that investigates all the factors that determine the presence or absence of diseases and disorders. that deals with the study of the causes, distribution, and control of disease in populations. Much of the data that epidemiologists collect comes from self-report from answers provided by people participating in a study. The top open access journals are peer reviewed scholarly Journal of Biometrics & Biostatistics. The top open access journals are freely available on the public internet domain, allowing any end users to read, download, copy, distribute, prink, search or link to the full texts of the articles. These provide high quality, meticulously reviewed and rapid publication, to cater the insistent need of scientific community. These journals are indexed with all their citations noted. The top open access journals are indexed in MEDLINE, PUBMED, SCOPUS, COPERNICUS, CAS, EBSCO and ISI.