"[E]mployers will spend an average of $693 per employee on wellness-based incentives in 2015, up from $594 in 2014 and $430 five years ago. Of the 79 percent of employers who offer health improvement programs, larger companies, those with more than 20,000 employees, are spending the most on these programs, where the per-employee average climbed to $878, up from $717 in 2014. The average for companies with between 5,000 and 20,000 workers rose to $661, up from $493 in 2014.... Fewer than half (47 percent) of employees earned their full incentive amount in 2014, while 26 percent earned a partial amount. Together, this translates into millions of dollars of unclaimed incentives."