A new study says that the gender pay gap exists even in nursing, an occupation dominated by women.
The researchers found that among registered nurses, women's salaries average about $5,000 less than men's. That gap isn't as big as in other occupations, but it hasn't budged in more than 20 years.
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They say the findings are surprising, since about 90 percent of the nation's more than 2 million registered nurses are women.
The reasons are unclear but one factor may be that when women nurses leave to have children, they re-enter the workforce at a lower pay scale than their male peers who never took time off.
The study appears in Tuesday's Journal of the American Medical Association.