Partnership for Clear Health Communication
National Patient Safety Foundation - Ask Me 3 for patients and healthcare providers http://www.npsf.org/askme3/
National Assessment of Adult Literacy (NAAL) http://nces.ed.gov/pubs2006/2006483.pdf
These results measure the health literacy of adults living in the United States. Health literacy was reported using four performance levels: Below Basic, Basic, Intermediate, and Proficient.