The standard error for the U.S. offer rate is approximately 0.43% for firms with fewer than 50 employees and 0.19% for firms with 50 or more employees. The standard error for state level estimates (less than 50 employees) ranges between 1.45-4.00% and the standard error for state level estimates (50+ employees) ranges between .59-2.51%.

Agency for Healthcare Research and Quality, Center for Cost and Financing Studies. 2009 Medical Expenditure Panel Survey - Insurance Component. Table II.A.2.

Definitions and descriptions of the methods used for this survey can be found in the Technical Appendix: http://www.meps.ahrq.gov/mepsweb/survey_comp/ic_technical_notes.shtml.

MEPS: The Medical Expenditure Panel Survey IC is an annual survey of establishments that collects information about employer-sponsored health insurance offerings in the United States.