It's interesting to me that Voyager does that much better than TNG. Both shows had the same number of women in the main cast (Crusher, Troi, Yar/Guinan vs Janeway, B'Elanna, Kes/Seven) so other things being equal there should be similar number of opportunities for conversations that meet the test.
Obviously Janeway being the captain (and therefore a more prominent character, even within an ensemble cast) should give Voyager a boost, but I hadn't anticipated the difference would be so extreme!