Well I'm not sure, the only side effect I think I have is that my c*** has become slightly disfunctional (shape and size), although I can still get an erection, it's just smaller, but that would be considered a minor effect in comparison to a lot of others listed.
The survey was conducted with around something like 19,000 men so I guess there's no reason to say it's not accurate. But so many people (mainly on the internet) complain about side effects of Propecia it's not true. So something's not right.