[arkh]

They don't. They usually take the average of all working men and average of all working women. Some go with not just working but "of working age".

[laylao]

Do they usually use average instead of median? That terribly skews the numbers with the top 0.2% being weighted much more highly than the bottom 99.8%.

The gender distribution for the top 0.2% doesn't matter since most men and women will never reach that income.