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Search Results: 1 - 10 of 10137 matches for " age estimation "
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Variables métricas y angulares de la rama mandibular en radiografías panorámicas, como indicadores de la edad cronológica
Espina-Fereira,ángela; Ortega,Ana Isabel; Alonso Barrios,Fernando; Maldonado,Yadelsy Jackelina; Fereira,José Luis;
Investigación Clínica , 2007,
Abstract: this paper had as goals to identify the presence of age indicators in the mandibular ramus and to study their applicability in estimating the chronological age of children between the ages of 6 and 12 years. for this, a sample of 128 individuals (70 males and 58 females) was selected, all without chronic or acute sicknesses. an evaluation was made of the metric and angular variables of the mandibular ramus on panoramic radiographs of the oral cavity. the greulich-pyle method was applied to estimate the skeletal age, and the demirjian et al. method was applied to estimate the dental age. a positive correlation, statistically significant, could be observed between the metric variables studied and the chronological age; nevertheless, the angular variables did not show correlation with the chronological age. regression models were built using metric variables of the mandibular ramus in order to estimate the age, which made a significant contribution to the calculation of the age. a consistent subestimation of the skeletal age and an overestimation of the dental age were found in both sexes. it was evident that a combination of the dental age, the skeletal age and the metric variables obtained in the mandibular ramus, increases the precision for calculating the chronological age, when compared to separate-made estimations of the dental and skeletal age. the proposed regression models can be used for estimating the age of cadavers in advanced states of decomposition and in living individuals without valid identification documents.
Life lived and left: Carey's equality
James W. Vaupel
Demographic Research , 2009,
Abstract: In a stationary population, age composition and the distribution of remaining lifespans are identical. This equivalence can be used to estimate age structure if information is available on time to death.
Age-Related Bias in Age Estimation Based on Facial Images of Others  [PDF]
Takashi X. Fujisawa, Yasuhiro Azuma, Masato Konishi, Naoyuki Miyamoto, Noriko Nagata
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.74047
Abstract:

In this study, we hypothesized that the tendency toward an age estimation bias when judging age based on facial images was driven by relative comparison with one’s own age, similar to situations of face-to-face communication. Using facial images as stimuli, participants were asked to assess the ages of those in the images in relative terms (younger or older than the participants themselves). We examined the relationship between age estimation bias and participants’ age and gender, as well as the type of facial expression in the images (smiling or neutral). This bias was found throughout most gender and age groups, with the exception of the middle-age female group. Moreover, the bias was greater in men than women, and was influenced by both age and type of expression. These results suggest that the main factors responsible for age estimation bias interact in a complex juxtaposition of variables such as sex, age, and expression.

Incremental lines in root cementum of human teeth: An approach to their role in age estimation using polarizing microscopy
Aggarwal Pooja,Saxena Susmita,Bansal Puja
Indian Journal of Dental Research , 2008,
Abstract: Age estimation is an important factor in the identification of an individual in forensic science. The hard tissues of the human dentition are able to resist decay and degradation long after other tissues are lost. This resistance has made teeth useful indicators for age calculation. Recent research indicates that tooth cementum annulations (TCA) may be used more reliably than any other morphological or histological traits of the adult skeleton for age estimation. The purpose of this study was to examine the correlation between age and the number of incremental lines in human dental cementum and to ascertain the best method of studying cementum with respect to different forms of microscopy. Thirty nonrestorable teeth were extracted from 20 people, and longitudinal ground section of each tooth was prepared. Photomicrographs of the area at the junction of apical and middle third of the root under light and polarized microscope were taken. The cementum was composed of multiple light and dark bands that were counted on the photomicrograph with the help of image analysis software and added to the average eruption time of individual tooth. The predicted age of the individual was thus obtained. Results showed a significant correlation between the predicted age and actual chronological age of the individual. These data indicate that quantitation of cementum annuli is a moderately reliable means for age estimation in humans and polarizing microscopy is a better means of visualizing incremental lines of cementum compared to light microscopy.
Estimación forense de la edad en torno a 18 a?os: Revisión bibliográfica
Garamendi,P.M.; Landa,M.I.;
Cuadernos de Medicina Forense , 2003, DOI: 10.4321/S1135-76062003000100003
Abstract: we present a review of the main studies published to date in the medical literature on the forensic estimation of age in supposed minors without papers. in recent years, approximate age estimations in supposed minors without papers are increasingly ordered by immigration authorities in spain and most european council member countries. the main aim of this review was to introduce forensic physicians to the state of the art on forensic estimation of the age of living subjects so that physicians can properly analyze the medical tests habitually used.
Estimación forense de la edad en torno a 18 a?os: Estudio en una población de inmigrantes indocumentados de origen marroquí
Garamendi,P.M.; Landa,M.I.; Ballesteros,J.; Solano,M.A.;
Cuadernos de Medicina Forense , 2003, DOI: 10.4321/S1135-76062003000100004
Abstract: we present a review of a population of 114 immigrant moroccan males for which an age estimate was requested. the subjects' real chronological age was confirmed by the moroccan embassy in spain. the confirmed age range was between 13 and 25, with an average age of 18.1 years and a typical deviation of 2.03. the following tests were performed to arrive at the forensic estimation of age: general physical examination, carpus x-ray (greulich and pyle method) and dental orthopantomography to determine the degree of maturity of the third inferior molars (dermijian's method). carpus x-ray (skeletal age) was the most useful method, followed by dermijian's method (dental age), as prediction factors of a chronological age of over or under 18. the combination of skeletal and dental age variables represented a significant improvement in the prediction of the chronological age of the subjects in this population, reducing the number of ethically unacceptable test errors to a minimum.
Osificación del cartílago costal de la primera costilla en relación con la edad: Aplicaciones en la estimación forense de la edad
Garamendi,PM.; Landa,MI.; Alemán,I.; Botella,MC.;
Cuadernos de Medicina Forense , 2007, DOI: 10.4321/S1135-76062007000300002
Abstract: the results of a research on ossification of first rib cartilage in a spanish population are presented in this paper. our sample is constituted by 123 digital x-rays studies had made up our sample. minimum subject age has been 5 years old and maximum age 75 years old. stage 0 has been usually found out in subjects between 5 and 19 years of age. stages 2 and 3 had been found out in subjects at a minimum age of 24 years old. previous researches had pointed out that stage 3 could be observed in subjects at an age of at least 21 years of age. we suggest that the analysis of the ossification degree of the first rib cartilage could be useful as a complementary method for the forensic estimation of age based on radiographic methods.
Datación mediante racemización del ácido aspártico en dentina humana
Barriga Salazar,Cristopher; Rivera Martínez,César; Suazo Galdames,Iván;
Medicina Legal de Costa Rica , 2012,
Abstract: determining the age at death based on aspartic acid racemization (aar) in human dentin has been applied successfully in forensic dentistry for many years. the use of this procedure in the dentine provides a simple and cost effective method which can achieve an accuracy of plus or minus 3 years. today this determination is not standardized, inconsistencies must be resolved to successfully implement the technique for age determination in cases of forensic interest
Age Estimation based on Neural Networks using Face Features
Nabil Hewahi
Journal of Emerging Trends in Computing and Information Sciences , 2010,
Abstract: In this paper we propose a methodology based on Neural networks to estimate human ages using face features. Due to the difficulty of estimating the exact age, we developed our system to estimate the age to be within certain ranges. In the first stage, the age is classified into four categories which distinguish the person oldness in terms of age. The four categories are child, young, youth and old. In the second stage of the process we classify each age category into two more specific ranges. The uniqueness about our research project is that most of the previous research work do not consider the fine tuning of age as we are presenting in our research. Our proposed approach has been developed, tested and trained using the EasyNN tool. Two public data sets were used to test the system, these are FG-NET and MORPH. To evaluate our system’s performance, we carried out a comparative study between our proposed system, human being and other research trails. The obtained results were significant.
Age Estimation of Fish Using Otolith and Fish Measurements in a Multi-species Fishery: A Case Study for Pagellus erythrinus (L., 1758) from Iskenderun Bay (NE Mediterranean Sea)
M. Fatih Can,Suat Sahinler
Pakistan Journal of Biological Sciences , 2005,
Abstract: Age determination of fish in a multi-species fishery from the otolith or other hard parts of fish is time consuming and expensive process. There are some relationships between otolith and fish age. In this study, Otolith length (Ol), Otolith width (Owt), Otolith weight (Ow), Fish length (Lf) and Fish weight (Wf) were used to estimate the age of Common pandora, Pagellus erythrinus (L., 1758), using the general linear regression model; Y= Xβ+ε. Among the model with one variable, the model with Otolith length (Ol) variable was the best one, t = -2.101+0.691(Ol) (R2 = 0.862). Adding the other variables to the model did not have any significant effect on R2 values.
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