I have several members of my family that are nurses, firemen, and policemen. My brother and his wife work at the local trauma center and deal with motorcycle victims on a regular basis for our county. He says the majority of crash victims are 25 years of age or younger, have alcohol and or drugs on board and speed was a major factor in the accident.
He also says due to the increase of "middle age" motorcycle riders now riding HD or other cruiser types, they are starting to show an increase with the same factors appearing ie, alcohol, drugs, and or speed as a major factor in the crash.
IMHO, with the gas chrisis now in full swing, and I regularly see riders without the proper riding gear, including pin-stripped business suits, tee shirts, cut-offs and tennis shoes as riding gear, oh, and yes a helmet, going down the road, I would speculate that this also should contribute to injury and or death gained while riding when an accident occured.
One other interesting comment my brother mentioned as to crash victims, he said the majority of riders that were killed in an accident died due to internal injuries, and not head injury, but that head injuries were a big issue if the rider was wearing an un-approved helmet like the skid-lid or beanie type, which is one of the first items to come off your body, usually over your face when in a crash. Be safe, PM. <><