That's in the study itself, anyone can Google it if they're interested and the same crew has other studies too and I believe I"ve linked to them in my seasons and swaying essay that Beadin posted. It is a fairly small difference and while I don't think anyone should delay TTC because of it, it's something that does appear to be real and consistent. if it's something that works out for individuals to include, that's great. If not, eh, let it go and sway in other ways.
The fact remains that a handful of our experiences on this site are meaningless because firstly we're a small group of people and secondly we're here because we have all/mostly one gender and are not the population as a whole. :)