杨宇雷,吴荣奇,费 耿,林中圣,施 群,肖 碧,王黎扬,葛延昌,孟航,马开军,陈新
(上海市公安局物证鉴定中心 上海市现场物证重点实验室,上海200083)
尸温相关因素推断死亡时间的研究
杨宇雷,吴荣奇,费 耿,林中圣,施 群,肖 碧,王黎扬,葛延昌,孟航,马开军,陈新
(上海市公安局物证鉴定中心 上海市现场物证重点实验室,上海200083)
目的 统计分析影响尸体温度下降多因素和死亡时间的相关性,探索尸温推断死亡时间的创新应用。方法 建立影响尸体温度(直肠温度)下降相关因素的采集标准,收集实践工作中的157例明确死亡时间真实案例的相关数据,根据实际工作经验结合统计学的基本要求对各因素进行量化评分,利用EXCEL和SPSS软件对数据进行处理,采用多元线性回归的方法统计分析各影响系数同死亡时间的相关性。结果 获得了具有统计学意义的回归方程,Y=25.993+0.04X1+0.172X2+0.88X3+0.047X4+0.373X5+0.347X6-0.766X7,决定系数R2=0.876。结论 该方法为尸温推断死亡时间的创新应用,经测试可用于实际工作。
尸体温度;死亡时间;影响因素;量化评分;多元线性回归
Abstract:Objective To statistically analyze the correlation between factors related to body temperature drop and postmortem interval,and to establish an innovative method for estimating postmortem interval by body temperature.Methods The collection standard of the factors influencing body temperature drop was established.Data of 157 cases which had exact postmortem intervals were collected.The related factors were quantitatively scored according to practical experience and basic statistic requirements.The data were processed by EXCEL and SPSS software,and the correlations between the factors and the postmortem intervals were analyzed with multiple linear regression.Results A statistically significant regression equation was obtained:Y=25.993+0.04X1+0.172X2+0.88X3+0.047X4+0.373X5+0.347X6-0.766X7.The correlation coefficient R2was 0.876.Conclusion The study presented an innovation application of body temperature for estimating postmortem interval,which had been tested in the practical work.
Key words:body temperature;postmortem interval;related factor;quantitative score;multiple linear regression
死亡时间是指法医检查尸体时刻距死者死亡时刻的间隔时间,死亡时间推断是法医实际工作中需要首先解决的重要任务之一,也一直是法医学鉴定的难点和研究的热点[1]。由于死亡时间推断的影响因素繁多,还尚无一种能完全克服各种影响因素或者忽略影响因素的死亡时间推断方法[2],而在公安法医的实际工作中,死亡时间的推断往往要满足于案件侦破等需要,快速、准确是一切技术手段的首要要求。……