Here is the link to her website that has some pdfs of her papers. Sorry I do not have the time to go through them at the moment, but this looks like the study she was writing about
:
http://www.soc.jhu.edu/people/DeLuca...oofs%20(2).pdf Johns Hopkins University : Department of Sociology : Stefanie DeLuca
It is from 2005, and so is the copyright date at the end of the redorbit article which was originally published in the USA Today.