Sangvichien, SanjaiBoonkaew, KomonChuncharunee, ApornKomoltri, ChulalukPiyawinijwong, SithaWongsawut, AlongkornNamwongsa, Suwalee2012-02-072012-02-072007-07Sangvichien 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.http://imsear.searo.who.int/handle/123456789/136803Objective: 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.enCraniumcraniometrymultiple logisticregression analysissex determinationThaisArticle