Re: Oh fuck...
You've walked in their shoes?
That doesn't sound like fun, and it is probably painful too. You know they aren't (really) made for men, right?
If they've simply averaged men and womens pay without regard to company, job type/description, seniority, hours worked, and so on, then they've compared apples and oranges.
The only way there wouldn't be any difference at all is when there are 50/50 employment and everyone everywhere is paid the exact same salary regardless of job type/description, hours worked, etc (as I mentioned above).