meic wrote:They dont ask but they rather safely assume that of the rest they were wearing a helmet on a motorcycle and were not wearing a helmet otherwise unless they say they were.
But there's the thing. Generally speaking, trauma practitioners don't question head injuries in most cases. Around half of all traumatic brain injury occurs inside motor vehicles, and head injury rates are near-identical in serious injury casualties on foot, on bicycles and in cars, but I've yet to see an ambulance service even start a discussion about whether helmets would make sense in those cases, where—if helmets are effective—they would have a far, far greater population effect.
As an example, the WMAS blog is one of the most strongly biased sources of this. They'll mention cycling helmets at every opportunity, very often ignoring third party behaviour at the same time, and will just shrug at all other head injuries. It is the epitome of the first cartoon earlier in the thread, but sadly it's not just a couple of opinionated commuters on a train, it's a respected organisation.
meic wrote:It is only the use of cycling helmets by cyclists that the question is collecting data about.
Sure. But it's like seeing half of all serious eye injuries occur in people doing DIY with power tools and half the rest occur in bystanders being hit by debris from people using power tools, and then collecting data on the use of safety glasses by badminton players who present with a broken ankle.