Review:
Graphics and statistics for cardiology: comparing categorical and continuous variables
Kenneth Rice, Thomas Lumley
Heart heartjnl-2015-308104
doi:10.1136/heartjnl-2015-308104
http://faculty.washington.edu/kenrice/heartgraphs/
NHANES (National Health and Nutrition Examination Survey) http://www.cdc.gov/nchs/nhanes/