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Women currently occupy about 17 percent of the seats in Congress, up from 3 percent in 1979.
Researchers from Stanford University and the University of Chicago looked at how many bills lawmakers introduce and how much money they bring home to their districts.
The study revealed that San Jose Congresswoman Zoe Lofgren, like other women in Congress, increased the flow of federal dollars to her district during her first term.
One researcher believes many congresswomen have to be the most politically ambitious candidates in order to get elected.
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