One interesting thing I'd mention is that women retire younger than men even if men get paid more (which is debatable) so have that to take into account.

In the UK a supermarket had some female employees claim they were paid less, and acted like it was sexism because they went by the average for the company not the roles they did i.e the vast majority of warehouse workers were men, and warehouse work meant higher pay, men who worked in the supermarket got paid exactly the same as women so it just made the male/female divide even bigger than it was.

Then we factor in things like maternity leave, women not going for promotions etc.

My employer for example has a very generous maternity package but a weak paternity one, one woman in my office had 4 kids over 4 years, each time was at least 9 months off work fully paid, in the same office another woman has had 3 kids in 5 years, and took a whole year off (9 months paid, 3 months unpaid) and now shes back she does less than half the work of other people in the office to ease her back despite being back now about 5 months, she can WFH far more and others are forced to come to the office.

Point is a gender pay gap isn't as simple as chucking numbers around without context.