1. This Privacy Index is based on an analysis of the privacy policies of the top 100 U.S. websites as ranked by Alexa in September 2011
  2. "Privacy Online: A Report To Congress". The Federal Trade Commission. June 1998. pg. iii.
  3. Calculated using the the Flesch-Kincaid Grade Level Readability Formula
  4. "What is Health Literacy?". National Patient Safety Foundation.
  5. Calculated at 250 wpm reading comprehension. See: "How to Improve Your Reading Speed". eHow. 10/23/2011.