Not to immediately launch into a negative post, but I have always been a bit put off by the categorizing in that paper every time I see it come up. Group 3 is such a massive catch all (and definitely applies to the overwhelming majority of MTFs on this site and elsewhere), and it seems to dismiss or gloss over a large portion of FTMs outright. It's not so much that the paper is wrong, just has a bit of a reductionist feeling to it.
For my part, I don't really feel like I fit in any group. I'm closest to 3, but my reaction of drawing away from society entirely doesn't really line up with the generic description of over compensating as male (and I would outright shun a lot of the typical male activities). I'm not sure when the paper was written, so this might be more of a generational issue? Anecdotally it seems like everyone born before the 80s tends to line up with the description of group 3 a bit better, before it was more socially acceptable for men to not care about sports or act macho and what not. (In other words, it was a bit easier to hide behind the more gender neutral, or at least not overtly masculine, nerd label in the 90s and 00s without bucking cultural norms for men.)
(And I know that it says that those groups aren't the only ones, but I would wager the more nuanced versions of group 3 are more common than group 1, which seems exceedingly rare, so it is strange not to discuss them more directly.)
