Chenier T C, Evans L
Accid Anal Prev. 1987 Apr;19(2):133-9. doi: 10.1016/0001-4575(87)90032-7.
Previous studies had estimated that repeal of mandatory helmet wearing laws resulted in increases in the number of fatalities ranging from nearly 40% to essentially zero. This study was performed to determine more definitively the influence on motorcyclist fatalities of these repeals. After repeal, motorcyclist fatalities increased more in the states which repealed their laws than in those which did not in 24 cases out of 26, with the 95% confidence interval for the average effect being 25 +/- 6%. It is therefore concluded that repeals of mandatory helmet wearing laws for motorcyclists were followed by substantial increases in motorcyclist fatalities.
以往的研究估计，废除强制佩戴头盔法律导致的死亡人数增加幅度从近40%到基本为零不等。进行这项研究是为了更确切地确定这些废除法律对摩托车手死亡人数的影响。废除法律后，在26个案例中的24个案例里，废除法律的州摩托车手死亡人数的增加幅度比未废除法律的州更大，平均影响的95%置信区间为25±6%。因此得出结论，废除摩托车手强制佩戴头盔法律后，摩托车手死亡人数大幅增加。
