Beitrag
Sex estimation by Mastoid Triangle using 3D models
Toneva, Diana H.; Nikolova, Silviya Y.; Zlatareva, Dora K.; Hadjidekov, Vassil G.; Lazarov, Nikolai E.
HOMO Volume 70 No 1 (2019), p. 63 - 73
veröffentlicht: Aug 29, 2019
Online veröffentlicht: Jul 24, 2019
Manuskript akzeptiert: Feb 5, 2019
Manuskript-Revision erhalten: Feb 4, 2019
Manuskript-Revision angefordert: Jan 15, 2019
Manuskript erhalten: Nov 7, 2018
Open Access (Arbeit kann kostenlos heruntergeladen werden)
Abstract
Mastoid Triangle (MT) is a triangle constructed between the landmarks porion, mastoidale and asterion. The aim of the study is to evaluate the sex differences in the MT size in Bulgarian adults and to develop discriminant functions for sex estimation based on the MT sides and area. The study was carried out on 148 head CT scans. A sample of 53 males and 53 females was used for development of discriminant functions, and a test sample of 21 males and 21 females was applied for their validation. Using the software InVesalius©, 3D models of the skulls were segmented and exported in STL format. The 3D coordinates of the landmarks porion, asterion and mastoidale were collected using the software MeshLab©. The MT sides, area and angles were calculated. The sex differences were assessed by the independent t-test. Bilateral differences were evaluated using the paired t-test. Univariate and multivariate discriminant function analyses were applied. The results showed that the MT sides and area differed significantly between both sexes. Sex differences were also established for the angle at mastoidale. Bilateral differences were found in males for the distance porion-mastoidale, which was significantly greater on the right side. The MT dimensions showed sufficient discriminating power for sex estimation among Bulgarians (up to 89%), and the total MT area proved to be the best single sex discriminating trait. The test sample corroborated the usefulness of the MT in sex estimation demonstrating similar or higher overall accuracy rates.
Schlagworte
Mastoid triangle • sex differences • area • Bulgarians • discriminant functions