Estimating the forensic age of living individuals is ever more important in forensic practice, due to the ongoing increase of migratory flows, amongst other causes. Using the Greulich and Pyle method on a sample of 1150 individuals of the Spanish population (n = 560, 0-18 years for girls, and n = 590, 0-19 years for boys), the mean difference between the bone and chronological ages was obtained: 0.01 years (- 0.81, + 0.92) for girls and 0.33 years (- 1.15, + 0.34) for boys. For a same class of age and sex, the inherent variability was also evaluated: [Formula: see text] (0.41-1.25) for girls and [Formula: see text]years (0.36-1.76) for boys. To minimise systematic errors with regard to the reference population, adjustment factors are proposed for each age and sex. A sequential classification criterion based on decision trees is postulated to improve reliability in the prediction of maturity. Implementation of the decision criterion in three categories enables the doubtful individuals to be separated into the category of "undetermined" and to satisfactorily classify in the categories of "mature" and "under age": 0.96 (0.86-0.99) specificity; 1.00 (0.92-1.00) specificity; and 1.00 (0.92-1.00) predictive value.
Objectives: Artificial deformation of the cranium in humans has been related to powerful environmental-cultural stimuli that modify vectors of growth and development when the cranium is still malleable. Osteological differentiation into deformed and nondeformed remains enables the morphological information of individuals that make up ethnic groups or populations to be separately contrasted, the invariant measurements of deformation to be identified, the information provided by archeological remains to be placed in a social context, the cranial variation to be related to genetic variation (individuals without deformation), and predictions to be made (in the absence of direct genetic information). Methods: With samples of reduced size and many variables, we propose a decision rule based on: (a) pre-selecting variables (Kruskal-Wallis and Λ-Wilks test); (b) applying logistic regression to obtain the optimal classification criterion; and (c) defining a multi-criterion decision rule to bring about greater robustness. Results: After applying the decision rule to a sample of 180 crania (71 from the Selknam, 74 from the Yamana, and 35 from the Alakaluf ethnic groups), it was possible to identify the Selknam men with frontal deformation and the Yamana women with flattening of the parietal regions at the height of the bregma. Conclusions: From there on with the information provided by the graphical representation of the populations in the most informative dimensions and the homogeneity contrast between sexes, we related the frontal deformation in Selknam men to dragging firewood, vegetable matter, domestic utensils, and heavy pieces of meat from the hunt. On the other hand, the flattening of the parietal areas at the height of the bregma in Yamana women is related to loading and transporting vegetables and animals in baskets or leather sacks. K E Y W O R D S deformed skulls, Fuego-Patagonians, logistic regression FIGURE 1 Main sites of Tierra del Fuego and South Patagonia showing the diversity of crania, modified or not, by sexes. For more detailed information (only for current Chilean territory), see Alfonso-Durruty et al. (2015). Circles: female; triangle: male. Diamond: Not deformed. In black: with deformation LUCEA ET AL.
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