"...tend to work in lower-paying jobs than men."  I think that is likely correct.  

Also likely correct is the fact that some work has been downgraded over the past three decades, because managers and owners could hire women...and pay them less.  Once upon a time, one rarely heard a woman on the radio.  Rarely saw one on TV.  Where'd the men go?  Elsewhere, where the bucks were now greater.  Well, at least it allowed women to enter broadcasting as never before...

It's not so much different than food processing jobs that used to support white, middle-class families in America's midwest.  Not now.  Now these jobs are filled by Latino immigrants (legal and  illegal.)  Well, at least it allowed them to get a toe-hold in the USA...