I'm not really sure what the aim of this exercise is. Can women in the tech industry now march into their boss' office and demand an 18.6% pay rise? Not really since even though the median pay may be lower that doesn't mean that one employee's is. Without any analysis into why there's a difference this seems rather pointless.
A very detailed analysis of the gender pay gap between Uber drivers was published recently and non of the reasons are what could be considered discriminatory.