Employee Benefits in the United States, March 2009
http://www.bls.gov/news.release/pdf/ebs2.pdf
Reports that only 25% of the lowest wage earners had employer provided medical care benefits, even though, overall 70% of workers in private industry had such benefits. Offers statistics on access to benefits, and types of benefits, by worker characteristics including type of employment, union/nonunion, and by wage percentiles. From the Bureau of Labor Statistics.