Statistics, Population Health, Biostatistics and Epidemiology Sites
Besides the specific pages listed here, any of the NIH sites will have tons of data for that research area.
Data, data and more data &; the Centers for Disease Control and Prevention - CDC. Just about everything you can think of is here - from birth defects to immunizations to flood survival to public health (plus growth charts): http://www.cdc.gov
University of Texas Information Technology Services- their research consulting branch. Their job is to help UT folks solve statistics problems and conduct research, they will answer other questions if time permits (or if you are willing to pay for it). There is also a help and FAQ section that could answer questions: http://www.utexas.edu/its/rc/
This is a different sort of page; it is General Clinical Resources from the Univ. of Iowa Dept of Family Medicine page. It is a page of calculators, e.g., the 10-year risk of CVD and forms, e.g., the Hamilton Depression Scale: http://fpinfo.medicine.uiowa.edu/calculat.htm
The mission of the Southern Illinois University School of Medicine is to assist the people of central and southern Illinois in meeting their health care needs through education, patient care, research, and service to the community.