We know that women in much of the developed countries are less represented in STEM studies. However, such a statement hides the fact that women are approx. half of the students in biology, chemistry and maths (check e.g. here ) but barely 20% in engineering. It is often stated that women tend to choose careers where they feel more useful towards society but that is difficult to reconcile with the fact that the share of women in Chemistry is 50% but only 35% in Chemical Engineering, here. I have tried to find sources that would address this difference but in general the topic treated is STEM as a whole.
Are there studies focusing particularly in this difference in gender representation, engineering vs sciences?