AHRQ has updated its 2004 evidence report Literacy and Health Outcomes. The report reviews 81 studies addressing health outcomes (reported in 95 articles including 86 measuring health literacy and 16 measuring numeracy, of which 7 measure both) and 42 studies (reported in 45 articles) addressing interventions.
Learn how the the field of health literacy has advanced by viewing Health Literacy Interventions and Outcomes at:
http://www.ahrq.gov/clinic/tp/lituptp.htm.