for women, "skinner figures can equal fatter paychecks"

http://newsfeed.time.com/2011/06/07/study-for-women-skinnier-figures-can-equal-fatter-paychecks/

"Findings show that women who are 'very thin' make $22,000 more than their 'average weight' counterparts. And, at the other end of the scale, 'very heavy' women had a salary downwards of $19,000 compared to average weight workers."

I'd really love to know how they (I mean the man... the powers that be, determining women's salaries) *define* these weight categories...