Sex determination by discriminant function analysis of lateral cranial form

Area of Science:

• Forensic Anthropology
• Craniometry
• Human Osteology

Background:

• Accurate sex determination from skeletal remains is crucial in forensic anthropology.
• Traditional methods rely on subjective assessments of morphological traits.

Purpose of the Study:

• To develop and validate an objective, computer-assisted method for sex determination using cranial morphology.
• To analyze sex-specific differences in the lateral contour of Japanese adult skulls.

Main Methods:

• Digitization of 39 craniometric points on the lateral skull contour using a tablet digitizer and personal computer.
• Quantification of distance and gradient measurements for discriminant analysis.
• Application of a derived discriminant function to a test set of 21 Japanese adult skulls.

Main Results:

• Significant sex differences were observed in the nasal bone, supraorbital ridge, and forehead contours.
• Gradient measurements proved more effective than distance measurements in reflecting sex differences.
• The developed discriminant function achieved a mean correct sexing ratio of 86%.

Conclusions:

• A computer-assisted method utilizing cranial contour analysis can accurately determine the sex of Japanese adult skulls.
• Gradient analysis of specific cranial landmarks offers a reliable approach for sex estimation.
• This objective method enhances the precision of sex determination in forensic anthropological investigations.