One in five millennials said they have been depressed on the job, the most of any age group, a new survey found.

That’s compared with 16% of Baby Boomers and 16% of Gen Xers, according to Mashable.

Bensinger, DuPont & Associates, a firm that provides employee drug testing and assistance for problems like gambling, published the survey, Depression and Work: The Impact of Depression on Different Generations of Employees, to coincide with National Mental Health Awareness Month. The study said that depressed employees are more likely to function poorly at work.

There was no word on why millennials, born from 1978 to 1999, are more depressed than other groups. Baby boomers were born between 1946 and 1964 while Gen Xers were from 1965 to 1977.

The article continued:

Other impacts of depression in the workplace include absenteeism (missing work), tense work relationships or conflicts, and receiving verbal or written disciplinary action as a result of depression.

“While major depression affects 10% of [American employees], an overwhelming 75% of people with depression don’t receive formal treatment,” Marie Apke, chief operating officer for Bensinger, DuPont & Associates, said in a statement. “Depression costs the economy more than $23 billion annually due to absenteeism. While recent public health initiatives continue to enhance and expand our understanding of the social and economic costs of depression, it’s clear more work is needed to combat depression in the workplace.”

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