Sex estimation in Filipino crania using metric and nonmetric methods

Area of Science:

• Forensic Anthropology
• Biological Anthropology
• Human Osteology

Background:

• Cranial morphology is a key indicator for sex estimation in unidentified human remains.
• Cranial sexual dimorphism varies significantly across diverse human populations.
• Population-specific methods are often necessary for accurate sex estimation.

Purpose of the Study:

• To develop and validate population-specific sex estimation equations for contemporary Filipino crania.
• To assess the performance of existing non-Filipino and Asian-derived cranial sex estimation methods on a Filipino sample.
• To investigate variations in cranial sexual dimorphism within and between Asian populations.

Main Methods:

• Development of linear discriminant functions using craniometric data from Filipino crania.
• Development of logistic regression equations utilizing cranial nonmetric traits from Filipino crania.
• Cross-validation of developed equations and application of external equations to the Filipino sample.

Main Results:

• Craniometric equations achieved correct classification accuracies ranging from 78.8% to 91.3%.
• Nonmetric trait equations yielded correct classification accuracies between 63.8% and 89.7%.
• Filipino crania were poorly classified by equations from other populations, with males often misclassified as female.

Conclusions:

• Existing cranial sex estimation methods developed for other populations are generally unreliable for Filipinos.
• The homogeneity assumption of continental ancestry groups in forensic anthropology is challenged; validation is essential.
• Filipino-specific cranial sex estimation methods are vital for applications in missing persons investigations and disaster victim identification.