The pre-screening on a degree was from corporate policy. Requirement for the post was deemed to be a degree of 240 EHTS credits (=Bachelors), STEM area (Bsc. Eng or similar) but the education is organized a bit differently here so it is probably not comparable to US STEM fields. Pretty much just took out some Bachelor of Arts studies. Nurses for example got under STEM field.
Bigger turnover factor was the term limit on the employment. Corporate had a 1,5y policy in use so any hiring could only work 1,5 years with us. Job market situation is/was not such that people would leave or find other jobs with similar salaries easily. Sure some did, but that was not a big risk. I think we had to let more people go because the job was not something they could do (uninterrupted 5-shifts and night work just doesn't suit everyone)
Road to hell and all that. In the end we ended up hiring less qualified people because of their gender, that is the bottom line. Routinely passed on the "best" candidate for someone who would fill the team diversity better. Altho with the nature of the work, the qualifications didn't matter that much. Attitude and learning capability was way more important and that was really difficult to determine, but some people were just really good at interviews but limited openings meant that they never got a shot.
As said.. Nurses filled the educational requirements. Also ended up really good at the job, since they were used to high pressure multitasking and different shifts, but we rarely got any applications from women. Probably the larger factor in this was working hours/temporary structure/somewhat manual and physical tasks that were probably thought to be involved, even tho most of the work was really light and not physically demanding.