“…Research by the National Highway Traffic Safety Administration has shown that, among motorcycle riders, helmets have 37% effectiveness for preventing fatalities (21). Sarkar et al, in a retrospective study of coroner reports, hospital records, and police reports for motorcyclists who were fatally injured in crashes between July 1, 1988 andOctober 31, 1989 in Los Angeles County, California, reported 173 fatalities (155 drivers, 18 passengers) (22). Most (n ϭ 127, 73%) did not wear helmets, whereas 21% (n ϭ 37) wore helmets, and 5% (n ϭ 9) were unreported.…”