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In page Women in science:

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Women appear to do less well than men (in terms of degree, rank, and salary) in the fields that have been traditionally dominated by women, such as nursing. In 1991 women attributed 91% of the PhDs in nursing, and men held 4% of full professorships in nursing.[citation needed] In the field of psychology, where women earn the majority of PhDs, women do not fill the majority of high rank positions in that field.[1][citation needed]