Family-owned Sunnen Corp., based in the St. Louis area, has an on-site wellness clinic for its 465 employees, along with wellness programs that have helped keep health care costs at about the same level since 2009. An on-site clinic at Centene Corp. in Clayton, Mo., led to about $313,000 in avoided costs in 2012 for physician and emergency department visits and $532,000 in savings from avoided absences and increased productivity.

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