The percentage of workers enrolled in employer-sponsored health plans that require them to pay a share of their hospital bills has substantially increased, according to the Agency for Healthcare Research and Quality (http://www.meps.ahrq.gov/papers/st127/stat127.pdf). The agency's survey of private-sector employers found that the percentage of such workers increased from 33.8% in 1999 to 54.7% in 2003.
Hampton T. Hospital Copayments. JAMA. 2006;296(8):924. doi:10.1001/jama.296.8.924-a