活体跟骨数字X线片性别判定

Sex Determination by Discriminant Analysis of Calcaneal Measurements on the Lateral Digital Radiography

目的应用数字X线摄影方法测量跟骨,评估5项测量指标在法医学性别判定中的价值。方法393例受试对象随机分组,实验组334例(男性148例,女性186例),验证组59例(男性26例,女性33例)。每一受试对象按照规定投照方法摄跟骨侧位DR片,分别测量5项跟骨长度指标。方差分析检验实验组各项指标性别间差异,Fisher判别分析及多元逐步判别分析建立性别判别函数。验证组样本数据回代,前瞻性评估判别效能。结果5项指标性别差异有统计学意义(P<0.001)。共建立了6组性别判别函数,性别判断正确率在78.4%～88.9%之间;回代检验,判断正确率在79.7%～86.4%之间。结论跟骨侧位数字X线片5项长度测量指标代入判别函数进行性别判定的方法可为法医学个人识别中的性别判定提供帮助。

Objective Five measurements of the calcaneus taken on digital radiography （DR） of adults of Han Population of Sichuan Province were selected to determine sex by multivariate discriminant analysis. Methods Lateral radiographs of calcaneus taken from 393 subjects were collected. The samples were randomly divided into the experimental group （148 males and 186 females） and the examined group （26 males and 33 females）. Five measurements were taken from the radiography. The analysis of variance（AVON） was carried out to determine if there was significant difference between the male and female. The discriminant functions were drawn by Fisher discriminant analysis. The effects of all obtained functions were evaluated with the examined samples. Results There was statistically significant difference in the five measurements between the males and the females （P〈0.05）. Six groups of discriminant functions were obtained with an accuracy ranged from 78.4% to 88.9%. When applied on the examined samples, the sex discriminant accuracy varied from 79.7% to 86.4%. Conclusion These five measurements acquired from the lateral radiographs of calcaneus could be used for sex assessment during forensic identification of individuals.