Sex determination in Thai skulls by using craniometry: Multiple logistic regression analysis.
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Date
2007-07
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Abstract
Objective: To evaluate sexual dimorphism in the cranium and mandible of Thais by using Jorgensenûs craniometry and to
develop a statistical model to determine sex from craniometrical measurements and indices.
Methods: One hundred and one Thai skulls (66 males and 35 females) which ranged in age from 18 to 86 years were studied.
Results: According to craniometry, the skull of a male is larger and higher than that of a female. Considering each individual
measurement, although 26 of 30 measurements and 5 of 14 indices showed a statistically significant difference between males
and females, they had some overlaps. To predict gender more accurately, a multiple logistic regression model based on 4 skull
measurements (mm) i.e., nasion-basion length (M5), maximum breadth of the cranium (M8), facial length (M40), and bizygomatic
breadth of the face (M45) was developed as follows: In (odds) = Z = -52.5312 + 0.27 M5 - 0.1867 M8 + 0.1268 M40 +
0.319 M45 The probability of being males (P) is then ez/(1+ez). Using a cut off point for P of 0.5, this logistic model could
correctly predict 82.9% (95% CI: 66.4%, 93.4%) of females and 92.1% (95% CI: 82.4%, 97.4%) of males respectively with the
overall accuracy of 88.8% (95% CI: 80.8%, 94.3%).
Conclusion: Jorgensenûs craniometry of the cranium and mandible can be used to determine gender among Thais via a multiple
logistic regression model on M5, M8, M40 and M45.
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Keywords
Cranium, craniometry, multiple logistic, regression analysis, sex determination, Thais
Citation
Sangvichien Sanjai, Boonkaew Komon, Chuncharunee Aporn, Komoltri Chulaluk, Piyawinijwong Sitha, Wongsawut Alongkorn, Namwongsa Suwalee. Sex determination in Thai skulls by using craniometry: Multiple logistic regression analysis. Siriraj Medical Journal, 2007 Jul; 59(5): 216-221.