“This phenomenon doesn’t just affect young or entry-level workers,” said Peter Duris, CEO and co-founder of Kickresume.

“Even senior executives struggle with it—about 25% of those experiencing imposter syndrome were in senior positions,” he added. “In addition, nearly half of senior professionals said that additional training or experience could significantly ease their self-doubt.”

Related: Happy employees are 12% more productive than unhappy ones

Fifty-four percent of Gen X workers respond to their Imposter Syndrome by overworking, according to Kickresume, while 58% of senior-level professionals in the U.S. also respond with overwork.

Meanwhile, 55% of North Americans say Imposter Syndrome causes negative self-talk, 48% respond with overwork and 47% with procrastination.

At the same time, 76% of North American workers said Imposter Syndrome slowed their career progression in the long term, with 33% saying it had been significantly slowed.

Dr. Valerie Young, co-founder of the Imposter Syndrome Institute, identified five different types of imposter syndrome.

• The Perfectionist, who is set back by small mistakes (34% in North America)
• The Expert, who feels they need to know everything in their field (36% in North America)
• The Superhuman, who needs to succeed in every area, in and out of work (13% in North America)
• The Soloist, who finds it hard to accept help (7% in North America)
• The Natural Genius, who worries that if something doesn’t come easily, they must be bad at it (10% in North America)