Osteometric sex determination from the pelvis--does population specificity matter?

Area of Science:

• Forensic Anthropology
• Bioarchaeology
• Human Osteology

Background:

• Sex determination from skeletal remains is crucial in forensic anthropology.
• Discriminant function formulae using metric data are common but often considered population-specific.
• Existing formulae may not cover all populations, necessitating research into broader applicability.

Purpose of the Study:

• To evaluate the necessity of developing population-specific discriminant function formulae for pelvic measurements in sex determination.
• To compare the accuracy of combined versus population-specific formulae using pelvic metric data.

Main Methods:

• Seven standard measurements from the innominate bone were taken from three distinct populations: Greeks (n=193), South African whites (n=200), and South African blacks (n=199).
• Discriminant function formulae were developed for each population individually and then for the combined group.
• Classification accuracies were calculated and compared across different scenarios (stepwise, direct analysis, single measurement).

Main Results:

• Overall classification accuracy for sex determination was high, even when using formulae developed from combined populations.
• For stepwise calculations using all measurements, the combined group achieved 94.5% accuracy, comparable to separate group accuracies (94.8%, 94.5%, 94.5%).
• Similar high accuracies were observed in direct analyses, indicating minimal gain from population-specific formulae for pelvic data.

Conclusions:

• Population-specific formulae may not be strictly necessary for sex determination using pelvic measurements.
• Combined formulae demonstrate high accuracy, simplifying application in forensic anthropology when population origin is unknown.
• Further research is recommended, including other skeletal elements, while acknowledging the pelvis's high degree of sexual dimorphism.