Shafi Shahid, Gentilello Larry
Division of Burns, Trauma and Surgical Critical Care, Department of Surgery, University of Texas Southwestern Medical School, 5323 Harry Hines Blvd., Mail Stop 9158, Dallas, TX 75390-9158, USA.
Am J Surg. 2007 Jun;193(6):719-22. doi: 10.1016/j.amjsurg.2006.10.023.
The objective of this study was to measure the impact of higher speed limits on traffic deaths several years after the repeal of the 55 miles per hour (mph) National Maximum Speed Limit (NMSL).
Traffic fatality rates for 2003 were calculated for all 50 states and the District of Columbia, and compared between states with speed limits < or = 65 mph versus greater than 65 mph, adjusted for state differences in vehicle miles traveled and other potential confounding factors using negative binomial regression.
In 29 states with speed limits greater than 65 mph, there was a 13% increase in the risk of traffic fatalities (risk ratio 1.13, 95% confidence interval [CI] 1.03 to 1.24, P = .009). An estimated 2,985 lives may be saved per year with a nationwide speed limit of 65 mph or less.
Nationwide restriction of speed limits to 65 mph or less will save almost 3,000 lives every year.
本研究的目的是评估在每小时55英里（mph）的全国最高限速（NMSL）取消数年之后，更高的限速对交通死亡事故的影响。
计算了2003年美国50个州和哥伦比亚特区的交通死亡率，并对限速≤65 mph的州和限速＞65 mph的州进行了比较，使用负二项回归对各州车辆行驶里程的差异及其他潜在混杂因素进行了校正。
在29个限速＞65 mph的州，交通死亡风险增加了13%（风险比1.13，95%置信区间[CI] 1.03至1.24，P = 0.009）。若全国限速为65 mph或更低，估计每年可挽救2985条生命。
将全国限速限制在65 mph或更低每年将挽救近3000条生命。
