Figure 5.
Sex omission but not sex bias varies by journal. The proportion of articles reporting sex varies by journal, as does the proportion of articles that employ male and females without considering sex as a biological variable. Levels of sex bias seem similar between journals. In three out of the six journals analyzed, the majority of articles reported employing both males and females independent of whether sex was considered an experimental variable. In two journals, articles reporting the use of both males and females represent a plurality. Across all journals, the proportion of articles solely employing males is larger than the proportion of articles solely employing females.