This study documents increased out-of-pocket healthcare expenses from 2001 to 2004.  These findings are particularly pronounced for privately insured families leading the authors to conclude that private insurance is failing to protect a growing number of families.   

Banthin, J. S., Cunningham, P., Bernard, D. M. (2008). Financial burden of health care, 2001 2004. Health Affairs, 27(1), 188-95.  DOI: 0.1377/hlthaff.27.1.188.  http://content.healthaffairs.org/cgi/content/abstract/27/1/188 © 2008 by Project HOPE.