Validation Test on Metric Sex Assessment from Calcaneus of Unidentified Remains in Thailand
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Abstract
The objective of this study is to validate the metric sex assessment by calcaneus measurement of unidentified remains in Thailand. A total number of 140 calcaneus samples (70 males, 70 females) of the Central Institute of Forensic Science were selectively collected from the unidentified bodies found dead during 2003-2020 and with adult to elderly age range. The calcaneus is a common bone fragment usually found at crime scenes and plays an important role for individual profile in forensic investigation, especially the sex identification. In this study, the skeletal measurement of calcaneal samples collected from different positions under nine variables was examined. Data were analyzed using descriptive statistics with mean and standard deviation. Consider the means between males and females, all nine variables were found to be significantly different. For the study of gender classification, the accuracy of model equations for sex estimation was between 72.9 to 80.0% in males and 75.7 to 82.9 in females, according to the discriminant analysis based on the stepwise method. In comparison between other population groups and Thai populations in other regions, it was found that the equations were specific to each population as well as Thai population in other regions. Hence, this study can be utilized for sex estimation from unidentified remains in Thailand.
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