Category: coverage bias

Ask the Expert: Dr. Stephen Blumberg

Beginning in 2003, NCHS’s National Health Interview Survey [NHIS] has collected information on cell phone ownership and use among its respondents. In the ensuing 10 years, cell phone usage has grown substantially and has become all but ubiquitous. A 2006 Health E-Stat revealed that, for the last six months of 2005: approximately 8.4 percent of Read More >