Why Men's Acheivements are More Public

An article I shared a while back discussed reasons why women are less likely to blog (mostly that women need/want less outside praise for their achievements). I wonder, does this apply to other parts of their life? This study suggests yes:

Two ecologically valid studies involving anticipated public performance offer insight into women's tendencies to avoid placing their abilities under a spotlight. First, in an experimental study, women felt less comfortable than did men and experienced more personal risk when they anticipated that their test scores would be public. Second, in a naturalistic observational setting, students taking an experiential forensic psychology course were required to perform intellectually challenging activities in public. Women displayed more concern about the course requirements than did men, and subsequently dropped the course in disproportionate numbers.

Could this also be why women are less likely to do speak up in my class, pursue leadership positions or do improv?