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Sexual Dimorphism of the First Rib: A Comparative Approach Using Metric and Geometric Morphometric Analyses

Heaton

Sexual Dimorphism of the First Rib: A Comparative Approach Using Metric and Geometric Morphometric Analyses Thumbnail


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Abstract

This research investigated the sexual dimorphism of the first human rib using geometric morphometric and metric approaches on a sample of 285 specimens containing European Americans and African Americans from the Hamann-Todd collection. Metric measurements were investigated for sexual dimorphism and ancestral differences using univariate statistics. Four type II landmarks and 40 sliding semi-landmarks were placed outlining the dorsal and ventral curvatures of the ribs. Landmark data were processed using Generalized Procrustes analyses with Procrustes distance sliding, and the subsequent coordinates were investigated for sexual dimorphism and ancestral differences using Procrustes ANOVAs. Both geometric morphometric and metric data were analyzed using cross-validated discriminant function analyses to test the hypothesis that variables from both approaches can be combined to increase sex classification rate. European Americans had sex correctly classified as high as 88.05% and African Americans as high as 70.86% using a combination of metric and geometric morphometric variables.

Acceptance Date Dec 6, 2016
Publication Date Sep 4, 2017
Publicly Available Date Mar 29, 2024
Journal Journal of Forensic Sciences
Print ISSN 0022-1198
Publisher Wiley
Pages 1251-1258
DOI https://doi.org/10.1111/1556-4029.13421
Keywords forensic science, forensic anthropology, geometric morphometrics, first rib, shape analysis, sexual dimorphism, ancestry, discriminant function analysis, sliding semi-landmarks, landmark error
Publisher URL http://dx.doi.org/10.1111/1556-4029.13421

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