[FridgeSeal]

I’m pretty sure it’s the other way around:

Severity is the same for both genders (those that have it, feel it with similar enough degree and frequency), but in equal sized groups of men and women, there are more women who exhibit it.

[mattkrause]

It occurred to me that the original sources might be a lot clearer:

From Wikipedia's ref #1 (Langford and Clance, 1993)

"Studies of college students (Harvey, 1981; Bussotti, 1990; Langford, 1990), college professors (Topping, 1983), and successful professionals (Dingman, 1987) have all failed, however, to reveal any sex differences in impostor feelings, suggesting that males in these populations are just as likely as females to have low expectations of success and to make attributions to non-ability related factors."

And Ref #9 (Kumar and Jagacinski, 2006)

"Women expressed greater imposter fears than men and were also higher on ability-avoid goals."

The writing in the Wikipedia article is not great though, so it could have gone either way...