If you were to present a similar study with results that refute their claims I'd be all for reading it and making a logical assessment, but since your disputing their facts with your sarcastic opinion, I'll take the study...
I don't want to nerd out on everyone here, but I think this epitomizes what is wrong with not only the debate, but "studies" in general. When you're looking at a study, don't focus on the results. The results are only going to tell you what the authors want to tell you. Look, instead, at how the studies were conducted, who was in the studies, and who was not in the studies. Because by analyzing that, you can get an idea of what the studies
really say, and not what the authors are trying to tell you. So by all means, pay attention to that guy's sarcastic opinion, and declaring that the only equivalent evidence worth listening to is another study gives this study under review far more authority than it should ever receive.
In this case, the study tells us that among motorcycle accident victims that land in hospital in an urban area, there is no significant difference between the number of full-face helmetted riders and open-face helmetted riders (see what I did there? I explicitly
did not say that full-faced helmets don't prevent injuries more than open-faced helmets). Which, when you think about it, makes sense: a serious accident is going to involve more than just the face; so even
if your face gets injured, odds are your shoulder / legs / etc. are also hurt. Note how the study doesn't point out how many of the people wearing full-face helmets also wore proper protective clothing; so someone could have been wearing a full-faced helmet and a t-shirt. And of course, also note how proper protective clothing isn't given a satisfactory definition. So someone could have been wearing a full-faced helmet and a hooded sweatshirt, or someone could have been wearing an open-faced helmet and a proper leather jacket, and look where they would have been categorized. What also needs to be taken into account is cultural differences between Australian riders and North American riders. What if all of those open-faced helmet riders also wear 1.4 mm leather jackets and pants and gloves? What if those open-faced helmet riders have lots of experience, ride giant cruisers that travel slowly on side streets and have loud pipes*? What if the full-faced helmet riders are noobs riding 1 litre sport bikes and were predominantly riding on the highway? You think this wouldn't make a difference?
So what the study is
really saying is that full-face helmets don't have any magical properties that prevent you (where "you" = residents of Melbourne) from getting into accidents that would otherwise put open-face helmet riders in hospital. Which nobody ever thought in the first place.
Bear this in mind the next time you hear on the news, "A new study released shows that drug x causes nasty side effect y..."
* So everyone knows, I am being intentionally sarcastic on the point about loud pipes.