华盛顿州和科罗拉多州娱乐用大麻合法化后的车祸死亡率。
Crash Fatality Rates After Recreational Marijuana Legalization in Washington and Colorado.
作者信息
Aydelotte Jayson D, Brown Lawrence H, Luftman Kevin M, Mardock Alexandra L, Teixeira Pedro G R, Coopwood Ben, Brown Carlos V R
机构信息
Jayson D. Aydelotte, Kevin M. Luftman, Pedro G. R. Teixeira, Ben Coopwood, and Carlos V. R. Brown are with Trauma Service, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas-Austin. Lawrence H. Brown is with the Emergency Medicine Residency Program, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas-Austin. Alexandra L. Mardock is with Rice University, Houston, TX.
出版信息
Am J Public Health. 2017 Aug;107(8):1329-1331. doi: 10.2105/AJPH.2017.303848. Epub 2017 Jun 22.
OBJECTIVES
To evaluate motor vehicle crash fatality rates in the first 2 states with recreational marijuana legalization and compare them with motor vehicle crash fatality rates in similar states without recreational marijuana legalization.
METHODS
We used the US Fatality Analysis Reporting System to determine the annual numbers of motor vehicle crash fatalities between 2009 and 2015 in Washington, Colorado, and 8 control states. We compared year-over-year changes in motor vehicle crash fatality rates (per billion vehicle miles traveled) before and after recreational marijuana legalization with a difference-in-differences approach that controlled for underlying time trends and state-specific population, economic, and traffic characteristics.
RESULTS
Pre-recreational marijuana legalization annual changes in motor vehicle crash fatality rates for Washington and Colorado were similar to those for the control states. Post-recreational marijuana legalization changes in motor vehicle crash fatality rates for Washington and Colorado also did not significantly differ from those for the control states (adjusted difference-in-differences coefficient = +0.2 fatalities/billion vehicle miles traveled; 95% confidence interval = -0.4, +0.9).
CONCLUSIONS
Three years after recreational marijuana legalization, changes in motor vehicle crash fatality rates for Washington and Colorado were not statistically different from those in similar states without recreational marijuana legalization. Future studies over a longer time remain warranted.
目的
评估前两个将休闲用大麻合法化的州的机动车碰撞死亡率，并将其与未将休闲用大麻合法化的类似州的机动车碰撞死亡率进行比较。
方法
我们使用美国死亡分析报告系统来确定2009年至2015年期间华盛顿州、科罗拉多州以及8个对照州的机动车碰撞死亡年度数量。我们采用双重差分法比较了休闲用大麻合法化前后机动车碰撞死亡率（每十亿车英里）的逐年变化，该方法控制了潜在的时间趋势以及各州特定的人口、经济和交通特征。
结果
在休闲用大麻合法化之前，华盛顿州和科罗拉多州机动车碰撞死亡率的年度变化与对照州相似。在休闲用大麻合法化之后，华盛顿州和科罗拉多州机动车碰撞死亡率的变化与对照州也没有显著差异（调整后的双重差分系数=每十亿车英里增加0.2例死亡；95%置信区间=-0.4，+0.9）。
结论
休闲用大麻合法化三年后，华盛顿州和科罗拉多州机动车碰撞死亡率的变化与未将休闲用大麻合法化的类似州在统计学上没有差异。仍有必要进行更长时间的未来研究。
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