中文摘要：

目的：分析2004年至2008年北京市不同年龄组交通伤发生时间的分布特点,为交通伤预防和治疗提供科学依据。方法：回顾性分析2004年1月至2008年12月经北京市急救中心转送的交通伤患者的院前急救数据,将交通伤患者按年龄分为青少年组（0～17岁）、中年组（18～64岁）、老年组（65岁以上）。计算3个年龄组交通伤例数在24 h单时间点的构成比、1～12月的单月构成比,描述性统计分析3组患者的一般情况及受伤时间的分布特点及差异。结果：交通伤24 h分布特点3组不同：青少年组有两个发生高峰点,分别是早上7∶00～8∶00（6.75%,39例）,下午16∶00～18∶00（10.38%,60例;10.73%,62例）;中年组交通伤的24 h内分布比较平稳,8∶00～24∶00每小时的构成比变化不大,维持在1.67%～5.60%之间;老年组交通伤发生的高峰点在9∶00～11∶00之间（11.19%,151例;11.04%,149例）。3组单月交通伤发生数量的构成比基本一致,最低点均是2月份（4.15%,24例;5.28%,640例;5.26%,71例）,最高点均是10月份（12.11%,70例;10.38%,1 257例;12.30%,166例）。结论：3个年龄组交通伤的24 h分布特点不同,而12个月的分布特点基本一致,急救人员和交通管理人员应根据不同时间段交通伤发生特点合理调配人力资源,提高院前急救效果。

英文摘要：

Objective：To analyze the time distributions of traffic accidents happening in different age groups in Beijing from 2004 to 2008,and to provide information on the prevention and rescue.Methods： The traffic injury cases recorded by Beijing Emergency Medical Center from 2004 to 2008 were analyzed,and the data were separated by age： the youth（0-17 years old）,the adult（18-64 years old） and the senior adult（above 65 years old）.The constituent ratios of hours and months were calculated to describe the states and time distributions of all the cases.Results： The high peaks of accidents for the youth group occurred in the periods 7∶ 00 to 8∶ 00（6.77%,39） and 16∶ 00 to 18∶ 00（10.38%,60;10.73%,62）,and for the senior adult group appeared in the period 9∶ 00 to 11∶ 00（11.19%,151;11.04%,149）.The adult group showed a stable trend during the period 8∶ 00 to 24∶ 00.The amount of traffic injury happening in these three groups had the same status monthly,which turned out that most traffic accidents happened in October for all the groups（12.11%,70;10.38%,1 257;12.30%,166）,and February had the smallest number（4.15%,24;5.28%,640;5.26%,71）.Conclusion： The time distributions of traffic injury within these three groups do not show the same situation daily but do monthly.The emergency treatment team and traffic control personnel should pay attention to this and have special protocol for different cases to increase the efficiency of the prehospital rescue.