I've seen similar reports, especially when the National Safety Administration report to Congress in 1995 and in 1999, was used to prove the opposite. Here is an example: "Helmets are less effective in preventing most of the injury" came from studies in 1995. Then, from the 1999 study, "... Helmets 67% effective in preventing brain injuries and unhelmeted rider-related accident more than three times the damage of the helmet
These two examples show that more complex message is sent to the riders. to further illustrate this point here are some examples of the complex message:
accidents accounted for 45.5% cars in all patients with head injuries accounted for 37.1%, and of all cases related fatal head injury (The Journal of trauma, 1989), this indicates that dangerous cars than motorcycles.
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