The 87th Annual Meeting of the American Association of Physical Anthropologists (2018)


Subadult sex estimation using multi-slice computed tomography scans of the ilium

NATALIE L. ANDRAS1 and MICHALA K. STOCK2.

1Department of Biology, John Carroll University, 2Department of Anthropology, University of Florida

April 12, 2018 , Zilker 1/2/3 Add to calendar

Sex estimation is an important aspect of the biological profile because it allows for sex-specific methods to be used in age, ancestry, and stature estimation. However, few sex estimation methods exist for subadult individuals, and, oftentimes yield inconsistent. These inconsistences may be the byproduct of analyzing insufficient traits per study, employing nonmetric traits, and using historic samples. The present study aims to remedy some of the aforementioned issues by using multi-slice computed tomography (MSCT) scans of modern, subadult males and females to metrically examine size and shape differences of the ilium for sex estimation.

Fifty-six subadult MSCT scans of known sex and age were sampled from the University of New Mexico Health Sciences Center, Office of the Medical Investigator: 22 females and 34 males between the ages of one day to one year old. Using Geomagic, eleven landmarks were collected from the left ilium. Jackknifed linear discriminant function analyses using interlandmark distances, Procrustes coordinates, and principal components were used to assess classification accuracy.

Males were significantly larger than females (p<0.05), and classification accuracies ranged from 59.1% - 73.53%. Classification accuracies using interlandmark distances and Procrustes coordinates were comparable, and principal components provided the greatest classification accuracy. The results of this study suggest significant differences exist between the subadult ilium of males and females; however, the use of a larger sample size and/or analyses using the ilium in conjunction with the ischium and pubis may provide higher classification accuracies.

NIJ 2015-DN-BX-K009