The more free the genders are, the more they tend to polarise on certain careers.
Since they tend to pursue what they prefer.
I'm all for having no blockers for people choosing what careers they want. However people will move towards there preferences, and there preferences will be set either by nature or culture.
"The more free the genders are, the more they tend to polarise on certain careers."
Yeah, just calling a Scandinavian nation "free" says absolutely nothing about its particular societal pressures. Societal pressures which effect everyone whether they are egosyntonic or distonic to the individuals caught up in the society.
More evidence is needed to support this hypothesis.