In Physics, we had 3 women out of 93 students, in the second year, it was down to 50 students and 1 woman.
In IT, the first year, we had 150 students out of which 15 were women.
One day, I entered the wrong lecture hall and was amazed to see that half of the students were girls. A quick look at the course program revealed that this was an architecture class.
So there was no barrier to entry, no social, economic or other obstacle that hindered women from entering that university. They ALL could have taken physics, math or IT, but they CHOSE not to.
As professional IT consultant and developer, over the last 30 years, I have observed other differences: in IT, as in other engineering fields, you always have projects that are urgent or demand extra efforts over considerable amounts of time - you have to work late or over weekends etc.
I have done so with numerous men, but although I occasionally met women working in IT jobs, NONE of them ever agreed to do extra hours to complete urgent projects. They all wanted their time off to engage in social activities.