Despite spending more on employee wellness programs in 2010, only 37 percent of U.S. employers actually measure their program's effectiveness, according to the "Working Well: A Global Survey of Health Promotion and Workplace Wellness Strategies," released by Buck Consultants.

Employers spent 35 percent more—about $220—on each employee who participated in a wellness program in 2010 compared to 2009. The survey analyzed responses from more than 1,200 organizations in 47 countries representing more than 13 million employees.

"Organizations that measure the impact of their wellness programs are more successful at improving their employees' health and overall wellness," according to Barry Hall, a Buck principal who directed the survey. "However, many simply don't know how to measure their results, or they don't have the resources to do so."

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