Statistics can be a great way to quantify your research. Be sure to evaluate the sources of your statistical information, however, to make sure they come from unbiased sources. Government agencies (such as the U.S. Census Bureau) are generally considered reliable. Statistical information gathered from a commercial entity should be used with caution and evaluated for accuracy and authority.
Contact the Librarian if you need assistance, or if you are unsure of the validity of the statistics you gather during research.
CDC FastStats -- Health and Disease Statistics
"The FastStats site provides quick access to statistics on topics of public health importance and is organized alphabetically. Links are provided to publications that include the statistics presented, sources of more data, and related web pages." By the Centers for Disease Control & Prevention
CDC National Center for Health Statistics
"The National Center for Health Statistics' website, a rich source of information about America's health. As the Nation's principal health statistics agency, we compile statistical information to guide actions and policies to improve the health of our people. We are a unique public resource for health information - a critical element of public health and health policy."
The U.S. government's official search engine.
U.S. Census Bureau -- Current Census Data
"The U.S. Census Bureau offers the most comprehensive demographic data for the United States. The site includes information and statistics on the nation's population, housing, business and manufacturing activity, international trade, farming, and state and local governments."
World Health Organization -- Health Statistics by Region
"WHO is the directing and coordinating authority for health within the United Nations system. It is responsible for providing leadership on global health matters, shaping the health research agenda, setting norms and standards, articulating evidence-based policy options, providing technical support to countries and monitoring and assessing health trends."
World Bank Data
"The Data Catalog provides download access to over 2,000 indicators from World Bank data sources."
United Nations Statistical Division
"The Statistics Division is committed to the advancement of the global statistical system. We compile and disseminate global statistical information, develop standards and norms for statistical activities, and support countries’ efforts to strengthen their national statistical systems. We facilitate the coordination of international statistical activities and support the functioning of the UN Statistical Commission as the apex entity of the global statistical system."