Over the years, hundreds of studies have examined the efficacy of wellness programs with mixed results; a study from the RAND Corp. found most programs don't reduce companies' health costs, while a 2010 review found they do.
Much of that research has calculated savings by looking at the difference in health-care spending between employees who opt in to such programs and those who don't. But the new study, as a randomized control trial, measured differences by randomly creating a control group with no access to the wellness program at all. With that method, the researchers found that medical spending disparities pre-existed the wellness program.
"Our results are significantly different," said Damon Jones, an associate professor at the University of Chicago's Harris School of Public Policy who conducted the study along with two UIUC researchers. "They rule out the kind of effects you find in nearly 80 percent of those prior studies."
"We don't see anything trending toward savings."
First, money isn't much of an incentive. Without any cash offered, a little under half of employees completed the assessment and screening. A $100 reward for completing the screening only boosted that rate to 59 per cent. Doubling that reward didn't make much difference, raising the share of employees finishing the screening merely to 63 per cent.
Not that it may have mattered much to their employer. Looking at health insurance claims throughout the year, the researchers found participation in the wellness program didn't result in better health outcomes or lower health-care costs. The medical spending habits of the employees who didn't have access to the program were "almost identical" to those of the workers who did, said Jones.
It turns out that those most likely to take advantage of their employer's wellness offerings are healthy people who don't spend a lot on health care, and employees with the highest health-care costs are the least likely to participate. Surveys the researchers offered enrollees also found that wellness had no impact on job satisfaction or productivity.
Despite questions as to whether wellness programs actually work, companies are still pouring money into them. The industry ballooned from a US$1 billion one in 2011 to US$6.8 billion five years later, according to an IBIS World analysis, and last year, almost a quarter of employers boosted their wellness offerings, the Society of Human Resource Management found in its yearly benefits survey.
Some studies have found that wellness programs can take around three years to yield any benefits; the researchers in the University of Illinois analysis tracked savings for only a year, though they plan to keep tracking for four. "It is possible that effects will emerge in the long run," said David Molitor, another researcher on the study.
But the first year of results, he said, doesn't suggest future savings. In fact, the control group had slightly lower health insurance claims than those with access to the program.
Molitor's team also tracked how often employees using the wellness program went to the gym and whether they participated in a local run, to see if the program inspired healthier behaviours. They didn't do either more often than the control group. "We don't see anything trending toward savings," he said.
