Gender as a function of authorship position in three domains of scholarship from 1990 to present: cell and molecular biology (276,992 authorships), sociology (44,895 authorships), and mathematics (6,134 authorships).

<p>In molecular biology, women are overrepresented as first author but underrepresented at the last author position. In sociology, women are underrepresented in both first and last author positions. In mathematics, where the convention is for alphabetical author order <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0066212#pone.0066212-Waltman1" target="_blank">[5]</a>, women are neither under- nor over-represented at first or last author positions.