Quote:
Originally Posted by ninjaone
Let's have fun, show me one.
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The Effect of the 1992 California Motorcycle Helmet Use Law on Motorcycle Crash Fatalities and Injuries
Jess F. Kraus, MPH, PhD; Corinne Peek, MPH; David L. McArthur, PhD, MPH; Allan Williams, PhD
from the abstract
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—After implementation of the helmet use law, statewide motorcycle crash fatalities decreased by 37.5%, from 523 fatalities in 1991 to 327 in 1992, more than 37%, and an estimated 92 to 122 fatalities were prevented. Motorcycle fatality rates were reduced by 26.5%, from 70.1 per 100 000 registered motorcycles in 1991 to 51.5 per 100000 in 1992. Head injuries decreased significantly among both fatally and nonfatally injured motorcyclists.
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You asked for one, but there is so much more.
How about
Motorcycle helmet use and injury outcome and hospitalization costs from crashes in Washington State.
J Rowland, F Rivara, P Salzberg, R Soderberg, R Maier, and T Koepsell
from the abstract
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Although unhelmeted motorcyclists were only slightly more likely to be hospitalized overall, they were more severely injured, nearly three times more likely to have been head injured, and nearly four times more likely to have been severely or critically head injured than helmeted riders. Unhelmeted riders were also more likely to be readmitted to a hospital for follow-up treatment and to die from their injuries. The average hospital stay for unhelmeted motorcyclists was longer, and cost more per case; the cost of hospitalization for unhelmeted motorcyclists was 60% more overall ($3.5 vs $2.2 million). CONCLUSIONS. Helmet use is strongly associated with reduced probability and severity of injury, reduced economic impact, and a reduction in motorcyclist deaths.
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These are quite easy to find if you want more.