Accuracy Of Sex Determination Research Articles

Morphometric Assessment of the Piriform Aperture and Its Clinical and Forensic Applications

Abstract Background: The piriform aperture (PA) is a midface structure that forms the anterior skeletal boundary of the nose. It is highly variant due to its physiological adaptations to the climate. Its variations are useful in forensic identification and reconstructive surgeries of the face. This study aimed at determining the PA’s dimensions and their accuracy in sex determination. Materials and Methods: The PA’s dimensions were retrospectively examined using 336 (199 males and 137 females) adult cranial computed tomography images in the database of the radiology unit of a university teaching hospital in Delta State, Nigeria, following institutional authorization. The aperture’s index was calculated as a ratio of height to width. The data were analyzed using Statistical Package for the Social Sciences Version 23. The sexual dimorphism in the parameters was assessed using an independent t-test. Association among the continuous variables was analyzed by Pearson’s correlation test. P = 0.05 was considered statistically significant. The percentage accuracy for correct sex prediction was assessed using the discriminant function analysis. Results: A significant relationship between dimensions with sex was observed (P < 0.05). The width of the aperture was the best sex-discriminating parameter (70.2%). The overall accuracy for sex discrimination using the aperture’s dimensions was 75.0%. Conclusion: This study provides the standard ranges for the PA’s width and height, valuable for surgical planning. These dimensions were sexually dimorphic and demonstrated an acceptable overall accuracy of correct sex allocation (75%). Consequently, this aperture may be utilized as a supplementary tool in conjunction with other methods for sex determination within studied population.

Sex determination and odontometric dimensions - A study of a North Indian population.

Sex determination is an indispensable parameter in identifying unknown deceased individuals. It can narrow down the chances of possible matches by 50%, providing a crucial lead in personal identification. In cases of commingled, decomposed, fragmented, charred and unidentifiable corpses, the importance of dental morphometrics cannot be overlooked due to the resistance of teeth to post-mortem degradation. Addressing this quality of teeth, a descriptive cross-sectional study was conducted in a North Indian population to evaluate sexual variations in dental dimensions and to identify the most sexually dimorphic dental dimension. The study included 207 participants (114 females and 93 males) in the age group of 21 to 45 years. Dental casts were prepared after obtaining informed consent from the participants and ethical clearance from the institute's ethical committee. Six odontometric dimensions, namely incisor-incisor distance, inter canine distance, combined width of central incisors, inter-premolar distance, inter-molar distance, and dental arch height of each participant were recorded on the dental casts using standard procedures. Analysis of the data elucidated the existence of statistically significant sexual dimorphism in the dental dimensions of the participants. The results of the discriminant function analysis show a sex determination accuracy of 68.1%, with a cross-validation accuracy of 65.2%. The study found the incisor-incisor distance to be the most sexually dimorphic trait, making it the best predictor of sex in the present population. The results of the present study may be helpful in sex determination and personal identification from dental remains in medico-legal and disaster victim identification cases.

Quantifying Sexual Dimorphism by Analyzing Ramus Flexure and Bigonial Width in Orthopantomography.

Introduction The mandible constitutes one of the skull's largest and strongest bones. Growth spurts can influence it, and it has a variety of dimorphic traits that can be used to identify sex. In addition to observing, comparing, and evaluating the potential for mandibular ramus flexure and bigonial breadth to discriminate between sexes using digital orthopantomograms (OPG), a retrospective study was conducted to examine the validity of this method for sex estimation in the Indian population. Aim and objective This study aims to quantify sexual dimorphism by analyzing two mandibular parameters, the ramus flexure and the bigonial width, using orthopantomography (OPG). The objective is to determine the accuracy of sex determination using the ramus flexure and bigonial width. Materials and methods A total of 500 OPG images (250 males and 250 females) were analyzed using the Planmeca software (Helsinki, Finland). The ramus flexure was measured as the angle formed between the tangent to the inferior border of the mandible and the tangent to the posterior border of the ramus. The bigonial width was measured as the distance between the left and right gonion points. A statistical analysis was performed to assess sexual dimorphism and determine the accuracy of sex determination using these parameters. The study employed descriptive statistics, such as means and standard deviations, and an independent t-test to determine the significance of the characteristics in relation to males and females. Results The mean bigonial width for females was 193.3068 mm (SD = 13.51669 mm) and for males was 217.6308 mm (SD = 10.87453 mm), with a statistically significant difference (p = 0.000). The 95% confidence interval for the difference in the bigonial width between males and females was between -49.97173 mm and -43.93787 mm. For the ramus flexure, the mean was 0.0000 for both males and females (SD = 0.00000), with a significant difference between males and females (p = 0.003). The 95% confidence interval for the difference in the ramus flexure between males and females was between -0.59543 and -0.12457. Conclusion The results indicated significant sexual dimorphism in both the ramus flexure and bigonial width. This study demonstrated that the ramus flexure and bigonial width, measured using orthopantomography (OPG), exhibited significant sexual dimorphism. The analysis of these mandibular parameters provided valuable information for sex determination in forensic and anthropological contexts.

Automatic segmentation and classification of frontal sinuses for sex determination from CBCT scans using a two-stage anatomy-guided attention network

Sex determination is essential for identifying unidentified individuals, particularly in forensic contexts. Traditional methods for sex determination involve manual measurements of skeletal features on CBCT scans. However, these manual measurements are labor-intensive, time-consuming, and error-prone. The purpose of this study was to automatically and accurately determine sex on a CBCT scan using a two-stage anatomy-guided attention network (SDetNet). SDetNet consisted of a 2D frontal sinus segmentation network (FSNet) and a 3D anatomy-guided attention network (SDNet). FSNet segmented frontal sinus regions in the CBCT images and extracted regions of interest (ROIs) near them. Then, the ROIs were fed into SDNet to predict sex accurately. To improve sex determination performance, we proposed multi-channel inputs (MSIs) and an anatomy-guided attention module (AGAM), which encouraged SDetNet to learn differences in the anatomical context of the frontal sinus between males and females. SDetNet showed superior sex determination performance in the area under the receiver operating characteristic curve, accuracy, Brier score, and specificity compared with the other 3D CNNs. Moreover, the results of ablation studies showed a notable improvement in sex determination with the embedding of both MSI and AGAM. Consequently, SDetNet demonstrated automatic and accurate sex determination by learning the anatomical context information of the frontal sinus on CBCT scans.

GADNN: a revolutionary hybrid deep learning neural network for age and sex determination utilizing cone beam computed tomography images of maxillary and frontal sinuses

IntroductionThe determination of identity factors such as age and sex has gained significance in both criminal and civil cases. Paranasal sinuses like frontal and maxillary sinuses, are resistant to trauma and can aid profiling. We developed a deep learning (DL) model optimized by an evolutionary algorithm (genetic algorithm/GA) to determine sex and age using paranasal sinus parameters based on cone-beam computed tomography (CBCT).MethodsTwo hundred and forty CBCT images (including 129 females and 111 males, aged 18–52) were included in this study. CBCT images were captured using the Newtom3G device with specific exposure parameters. These images were then analyzed in ITK-SNAP 3.6.0 beta software to extract four paranasal sinus parameters: height, width, length, and volume for both the frontal and maxillary sinuses. A hybrid model, Genetic Algorithm-Deep Neural Network (GADNN), was proposed for feature selection and classification. Traditional statistical methods and machine learning models, including logistic regression (LR), random forest (RF), multilayer perceptron neural network (MLP), and deep learning (DL) were evaluated for their performance. The synthetic minority oversampling technique was used to deal with the unbalanced data.ResultsGADNN showed superior accuracy in both sex determination (accuracy of 86%) and age determination (accuracy of 68%), outperforming other models. Also, DL and RF were the second and third superior methods in sex determination (accuracy of 78% and 71% respectively) and age determination (accuracy of 92% and 57%).ConclusionsThe study introduces a novel approach combining DL and GA to enhance sex determination and age determination accuracy. The potential of DL in forensic dentistry is highlighted, demonstrating its efficiency in improving accuracy for sex determination and age determination. The study contributes to the burgeoning field of DL in dentistry and forensic sciences.

Comparative Study of Mandibular Canine Index and Maxillary Canine Index in Sex Estimation among North Indian Population

Introduction: Since teeth are easily approachable and each having different morphology, they form an excellent medicolegal and anthropological tool for sex estimation. Sexual dimorphism is difference in size and appearance among male and female teeth that can be applied for determination of sex. The basis of estimation of sex is comparing tooth parameters in male and female individual. Canine teeth shows highest sexual dimorphism among all teeth. Mesiodistal width of maxillary and mandibular canine can be used for sex determination based on sexual dimorphism.Aim: The aim of our study was to evaluate the comparative sex estimation by mandibular canine index andmaxillary canine index in north Indian population.Materials and Methods: The sample comprised of dental impression from 120 individuals (60 males and 60females), all young adults between 20 and 35 years of age. Impressions of the teeth were made using irreversible hydrocolloid (alginate) material and casts poured in dental stone. Mesiodistal dimensions and intercanine distance of mandibular and maxillary canine of both right and left side was measured by caliper. Mandibular and maxillary canine index was calculated by formula given by Nageshwar Rao et al.Results: Data were summarized as Mean and SD. Groups (in Gender Male vs female) were compared by unpaired or independent Student’s t test. When the level of accuracy for sex determination was measured using canine index it was found that 65% males and 65.83% females were predicted correctly. When maxillary canine index was used the sex was correctly predicted in it was found that 40.83% females and 32.50% males were predicted correctly.Conclusion: Mandibular and maxillary canine index can be used for sex estimation in North Indian population but accuracy of mandibular canine index is better than maxillary canine index.

Analysis of Amelogenin and sex-determining region on Y chromosome genes obtained from pulpal tissue for sex estimation by using multiplex polymerase chain reaction

In forensic odontology, Amelogenin and Sex-Determining Region on Y chromosome genes are commonly used for sex identification. Nevertheless, the amplification of both of these genes encounters limitations in determining sex, primarily due to deletions observed in certain racial groups and the influence of genetic disorders on these genes. This research aims to assess the precision of simultaneously amplifying both genes using multiplex polymerase chain reaction on samples derived from teeth that have been subjected to various forensic conditions. In this study, a total of 70 teeth, comprising 35 males and 35 females, were utilized, and all samples underwent genetic analysis to determine sex following exposure to different forensic scenarios. The findings revealed that both the quantity and quality of genetic material were reduced when exposed to harsh environmental conditions. Notably, the amplification of the sex-determining region on the Y chromosome gene outperformed the amplification of Amelogenin and achieved a sex-determination accuracy rate of 100%. In conclusion, dental pulp serves as a valuable source of genetic material even after exposure to diverse environmental conditions, and it can effectively be used for sex estimation purposes.

Sex Estimation From Measurements of the Mastoid Triangle and Volume of the Mastoid Air Cell System Using Classical and Machine Learning Methods: A Comparative Analysis.

Previous studies on the sexual dimorphism of the mastoid triangle have typically focused on linear and area measurements. No studies in the literature have used mastoid air cell system volume measurements for direct anthropological or forensic sex determination. The aims of this study were to investigate the applicability of mastoid air cell system volume measurements and mastoid triangle measurements separately and combined for sex estimation, and to determine the accuracy of sex estimation rates using machine learning algorithms and discriminant function analysis of these data. On 200 computed tomography images, the distances constituting the edges of the mastoid triangle were measured, and the area was calculated using these measurements. A region-growing algorithm was used to determine the volume of the mastoid air cell system. The univariate sex determination accuracy was calculated for all parameters. Stepwise discriminant function analysis was performed for sex estimation. Multiple machine learning methods have also been used. All measurements of the mastoid triangle and volumes of the mastoid air cell system were higher in males than in females. The accurate sex estimation rate was determined to be 79.5% using stepwise discriminant function analysis and 88.5% using machine learning methods.

Cephalometric radiograph-based approach for sex determination using maxillary sinus index in Surabaya, Indonesia

Accurate sex determination is a critical aspect of individual identification in various fields, including anthropology, forensic science, and archaeology. Various parameters from the skull, mandible, pelvis, and long bones are commonly utilized for this purpose. Recently, the potential of the maxillary sinus as a sex-discriminatory parameter has been studied by Khaitan et al. through the analysis of lateral cephalometric radiography. This study aimed to evaluate the feasibility of implementing the sex determination formula devised by Khaitan et al. for the adult population of Surabaya, Indonesia. For this purpose, 130 digital cephalometric radiographs of outpatients in the DHDC Dental Office in Surabaya, Indonesia, were assessed. The maxillary sinus height and width were measured to derive the maxillary sinus index (MSI) and calculate the discriminant score (D) for sex identification. This study revealed that the maxillary sinus’s average height in males was 37.111+5.13 mm, while in females, it was 34.538+4.36 mm. Males had an average maxillary sinus width of 44.152+4.11 mm, while in females it was of 38.849+3.33 mm. The MSI values for males (1.204±0.14) were higher than for females (1.135±0.10). The discriminant scores showed notable variations between males and females, with an 86% success rate for females and 27.8% for males. The present study provides evidence that the Khaitan formula can serve as a valuable complementary approach for sex determination in females. Sex determination based on the MSI is thought to be a population-dependent parameter in forensic sciences and requires careful interpretation in its application.

An evaluation of DNA sample source and molecular markers to determine gender in the short-beaked echidna (Tachyglossus aculeatus).

The short-beaked echidna is sexually monomorphic such that gender identification without veterinary intervention is challenging. The aim of this study was to evaluate and compare the most optimal noninvasive genetic source by extracting echidna genomic DNA(gDNA) from fecal scats, plucked hair, and quills to perform genetic sex testing using a range of molecular markers. Sex determination of 14 captive short-beaked echidnas was determined by amplifying isolated DNA from noninvasive samples, targeting two Y chromosome (male-specific) genes (mediator complex subunit 26 Y-gametologue [CRSPY] and anti-Müllerian hormone Y-gametologue [AMHY]), in addition to four confirmed sex-specific RADseq markers. Results of noninvasive samples were compared with blood samples and clinical records. Receiver operating characteristiccurves were used to assess accuracy of sex determination of markers for each sample type. The gender of the echidnas was successfully identified on 75% of occasions using fecal samples, 90.6% occasions using hair, and 84.6% occasions with quills. Overall, the male-specific RADseq markers accurately identified the sex of echidnas with all sample types for 90% of animals; compared with 81.5% using CRSPY, and 82.0% using AMHY to identify sex. Collection of hair, quills, and feces provides a useful alternative to invasively collected samples, however, the accuracy of results depends on sample type and genetic marker selected. We found gender determination in the short-beaked echidna was most accurate using four male-specific RADseq markers on gDNA isolated from blood and hair. The noninvasive genetic sexing techniques documented here will inform and facilitate husbandry and genetic management of captive echidna populations.

Evaluation of Contrast Radiography and Computed Tomography in Sex Determination of Gila Monsters (Heloderma suspectum)

Abstract Sex determination in reptiles is important for implementing appropriate husbandry, successful pairing for breeding programs, and reproductive medical care. In reptile species that are not sexually dimorphic, accuracy in sex determination is dependent upon methods other than physical observation. Preferred sexing techniques should be quick, noninvasive, and reliable, and they should be able to be performed by veterinarians with a broad range of reptile experience. Vast anatomical differences among reptiles make the efficacy of these techniques highly variable between species. This study evaluated hemipenis contrast radiography and computed tomography techniques, previously described in other Heloderma species, to determine reliability in sexing 23 Gila monsters (Heloderma suspectum). The results were compared to the sex determined by coelomic ultrasound, which indicated that there were 8 females and 15 males. Identification of hemipenes in males was shown in 1/15 (7%) by contrast radiography and 9/15 (60%) by hemipenis contrast computed tomography. Outline of the cloacal rim in females was seen in 100% (8/8) by contrast radiography and 100% (8/8) by contrast computed tomography. Our findings suggest that contrast radiography and computed tomography are not reliable methods for sex determination in Gila monsters, and that coelomic ultrasound is currently the most reliable, noninvasive technique for this species.

Sexual dimorphism in Louisiana pine snakes (Pituophis ruthveni).

The Louisiana pine snake, Pituophis ruthveni, is a cryptic, federally threatened snake species with several fragmented populations in Louisiana and Texas, USA. There are currently four captive breeding populations in zoos in the USA; however, little scientific data exists on their life history and anatomy. Accurate sex determination and identification of normal reproductive anatomy are an essential part of a veterinary exam and conservation programs. The authors had encountered various cases of sex misidentification in this species that were attributed to lack of lubrication of the sexing probes and enlarged musk glands. Anecdotal observation led to a hypothesis of sexual dimorphism based on body and tail shape. To test this hypothesis, we measured body length, tail length and width, and body to tail taper angle in 15 P. ruthveni (9 males and 6 females). We also obtained tail radiographs of all animals to document the presence of mineralized hemipenes. Significant dimorphism was identified in relative tail length, width, and taper angle; females consistently exhibited a more acute taper angle. Contrary to previous studies in other Pituophis species, a male-biased sexual size dimorphism was not identified. Mineralized hemipenes were confirmed in all males (a newly described trait in this species), and we found that the lateral view was consistently more reliable for identification of hemipenes compared to the ventrodorsal view. This information contributes to the scientific community's understanding of this species and is of use to biologists and veterinarians working towardconservation of this threatened species.

P2/P8 primer PCR effective in sex determination in Domestic birds

In avian species, sex determination is based on ZW-ZZ chromosomes. Males are homogametic have two Z chromosomes (ZZ), while females are heterogametic and have a Z and a W chromosome (ZW). The PCR has been successfully used for the detection of the sex in birds. In the current study, an effort to compare the accuracy of sex determination using primers P2/P8 & P2/NP/MP, targeting the Chromo-Helicase DNA binding (CHD) gene, in Domestic birds of known gender using PCR technique. A total of seventy-four sexed samples were identified by the P2/P8 PCR. A total of 72 valid results were obtained while two samples failed to provide an amplification. The female (ZW) showed two bands (350 & 365 bp approximately) separated from each other by a mere 15 bp, while, males (ZZ) showed a single band at 350 bp. Out of the seventy-two results all seventy-two samples were correctly identified by the test. The overall accuracy of the test stood at 97.29% (72/74).In the P2/NP/MP PCR, the female (ZW) showed two bands (330 & 270 bp) separated from each other by a 60 bp, while, males (ZZ) showed a single band at 270 bp. A total of 74 valid results were obtained. Out of the 74 samples sexed using P2/NP/MP PCR test, all 74 samples provided an amplification. However, out of the seventy-four samples, seven samples provided erroneous results. The overall accuracy of the test stood at 90.54%.Thus, the P2/P8 primer was more accurate in the sex estimation in domestic birds, whereas, the P2/MP/NP PCR has comparatively less accurate in detecting the sex in domestic birds. Although, it is worth mentioning that the P2/MP/NP PCR was 100% accurate in the estimation of sex in Khaki campbell duck (Anas platyrhynchos domesticus), Guinea fowl (Numida meleagris), Turkey (Meleagris gallopavo) and Japanese quail (Coturnix japonica). Depending on targeted species the P2/P8 PCR can be used to identify birds with precision.

Ultrasonographic sex determination of the flathead grey mullet (Mugil cephalus).

Determination of sex in fish without external sexual dimorphism is important. Sex determination of the flathead grey mullet (Mugil cephalus) in the culture system and spawn-producing and fish reproduction system is very important. Currently, there are several methods to determine the sex of fish; however, they are time-consuming, expensive and sometimes dangerous for the fish. The purpose of this study was the sex determination of flathead grey mullet by ultrasonography as a safe and accurate method. In this regard, 30 flathead grey mullets (early in their maturation) from a farm in Gomishan-Golestan province, Iran were examined using a portable ultrasound machine with a 6-12MHz waterproof linear transducer. Scanning was performed on the ventral body surface in the sagittal and transverse planes, between ventral and anal fins. Differences in shape, qualitative size, echogenicity and the wall layers of the ovary and testis were evaluated for sex determination. Results of ultrasonography were confirmed immediately at necropsy. Ultrasonographic accuracy for sex determination was 100%. The speed of the procedure was around 30s per fish. Overall, the sex determination of flathead grey mullet by ultrasonography was high in accuracy and speed, non-invasive and safe for fish and consumers, and may be considered a priority. Place of the organs in the M. cephalus coelomic cavity and the obtained experience showed that for rapid and easy sex identification, the best place to put the transducer is on the ventral surface of the fish in the caudal part of the coelomic cavity for taking transverse and sagittal ultrasonograms.

Highly sensitive and quick in ovo sexing of domestic chicken eggs by two-wavelength fluorescence spectroscopy

The in ovo sexing of chicken eggs is a current task and a prerequisite to overcome the mass killing of male day-old chicks from laying lines. Although various methods have been developed and tested in recent years, practicable methods for sex determination are still missing which can be applicated in poultry hatcheries before the chicken embryo is capable of nociception and pain sensation. Optical spectroscopic methods enable an early determination of the sex. In this study, a novel method based on two-wavelength in ovo fluorescence excitation is described. More than 1600 eggs were examined. In ovo fluorescence was sequentially excited at 532 nm and 785 nm. The fluorescence intensities of the spectral regions behave inversely with respect to sex. It is shown that the observed sex-related differences in the fluorescence intensities are based on the embryonic hemoglobin synthesis. The accuracy of sex determination is 96% for both sexes. The hatching rate is not reduced compared to an equivalent reference group.Graphical

Morphometrics allometry changes and sexual dimorphism in Caragobius urolepis (Gobiiformes: Gobiidae)

The present study reported an alternative way of sex-determining for scaleless worm goby Caragobius urolepis based on the regression relationship of some morphological parameters. A total of 328 samples were collected at the trawl nets in two coastal regions in Bac Lieu and Ca Mau from April to August 2022. After collection, the samples were transported to the laboratory in order to measure the total length (TL), body height (BD), head length (HL), the distance of eye (DE), and mouth width (MD) before surgery for accurate sex determination based on gonads. Regression analysis results of TL-BD (growth pattern A+ in females and I in males), TL-HL (growth pattern A+ in females and A- in males), and TL- MD (growth pattern A- in females and A+ in males) could be used to determine the sex of this fish. Moreover, TL-DE and TL-BD could be used to estimate when the samples were collected, e.g , in the dry or wet season, because DE and BD displayed A+ in the wet season but A- in the dry one. The findings could be used as an alternative way to determine fish sex and catching season for this species and others in the Mekong Delta.

Highly sensitive sex determination method using the exon 1 region of the amelogenin gene

Sex determination is a crucial factor in the identification of unidentified human remains. Sex determination by DNA analysis is particularly useful because it can be applied to samples for which morphological characteristics are unavailable. Because samples handled in forensic DNA typing are easily degraded by environmental factors and microorganisms, there is a need for a method that can accurately determine sex even in highly decayed samples. Previous studies mainly used sex differences in an intron of the amelogenin gene. However, this region is highly polymorphic, and there are cases where accurate sexing cannot be performed because of genetic mutations in the target region. Thus, for reliable sex determination, it is desirable to select loci with as few non-sexual polymorphisms as possible. In this study, we focused on the exon 1 region of the amelogenin gene, which has very little polymorphism other than sex differences. We developed a primer set for sex determination and compared it with the GlobalFiler™ PCR Amplification Kit (GF), which is widely used for forensic DNA typing. The results showed that the amount of DNA required for accurate sex determination was 25 pg for both methods, achieving equivalent sensitivity. Next, we compared the two methods using ancient human skeletons and found that the present method with its shorter amplicon was considerably superior to GF. The present method is simple, rapid, inexpensive, and suitable for analyzing highly degraded samples. Therefore, this method is expected to contribute to forensic sciences and physical anthropology.

Mandibular Ramus: An Indicator of Gender and Chronological Age - A Digital Radiographic Study

Background: The determination of sex and age of individual is important in forensic practice and medico legal purposes. Mandible may play a vital role in sex estimation as it is the most dimorphic bone of skull that often is recovered intact. The present study was conducted to evaluate the reliability of mandibular measurements in gender determination and age estimation as seen on digital panoramic radiographs. Aims and Objectives: The aim of the study was to evaluate and compare seven parameters of the mandibular ramus obtained from digital orthopantomographs, and to assess the usefulness of these parameters as aids in gender and age estimation. The objectives were: 1. To assess:-Maximum ramus breadth in mm, Minimum ramus width in mm, Projective height of ramus in mm, Maximum height of the ramus in mm, Maximum coronoid height in mm, Gonial width in mm and Bigonial angle in degrees, 2. To correlate each of these seven variables with the age of the patient, and 3. To compare these seven parameters between males and females. Materials and Methods: OPGs of 500 patients satisfying inclusion and exclusion criteria selected from the Dept. of Oral Medicine and Radiology, Govt. Dental College, Kottayam, were being studied. Permission from the concerned departments was taken. The measurements were made on this radiograph using GIMP 2.8 Software. Results: All the parameters were found to show statistically significant difference between males and females. After performing logistic regression, an equation was formulated to determine gender from the parameters that were statistically significant in regression analysis. The cut off was set at 0.5. Values above the cut off value were interpreted as males and values below the cut off were interpreted as females. The overall accuracy of sex determination at this cut off value from this method was 73.9%. Significant correlation was not noted between the mandibular parameters and age of the individual. Conclusion: It can be concluded that the mandibular ramus can be considered as a valuable tool in gender estimation since it possesses resistance to damage and disintegration processes. Nevertheless, the age of the individual cannot be determined using this method.

Midshaft diameter of humerus and its accuracy in sex determination of south Indian population

Background: Humerus is one of the long bones generally favoured in osteometric studies as it appears to yield highest level of classification accuracy in sex determination. Aim: To study the midshaft diameter of humerus and its accuracy factor in sex determination. Methods: A total of 100 (Male - 72, Female - 28) dry human humeri were collected from the Department of Anatomy as well as from the under graduate students of Santhiram Medical College, Nandyal. The maximum midshaft diameter of humerus was measured from absolute greatest diameter without regard to the vertical or transverse plane. The minimum midshaft diameter of humerus was measured from absolute least diameter in the middle without regard to any plane or maximum diameter Results: The mean maximum mid shaft diameter of humerus in male bones was 1.953±0.027 and in female bones was 1.75±0.030. The mean minimum midshaft diameter of humerus in male was 1.657±0.0211 and in female was 1.485±0.026 in the present study Conclusion: The mid shaft diameter can be considered as one of the sex determinations factors due to its higher accuracy in males than females with other predictive variables of humerus.

Midshaft diameter of humerus and its accuracy in sex determination of south Indian population

Background: Humerus is one of the long bones generally favoured in osteometric studies as it appears to yield highest level of classification accuracy in sex determination. Aim: To study the midshaft diameter of humerus and its accuracy factor in sex determination. Methods: A total of 100 (Male - 72, Female - 28) dry human humeri were collected from the Department of Anatomy as well as from the under graduate students of Santhiram Medical College, Nandyal. The maximum midshaft diameter of humerus was measured from absolute greatest diameter without regard to the vertical or transverse plane. The minimum midshaft diameter of humerus was measured from absolute least diameter in the middle without regard to any plane or maximum diameter Results: The mean maximum mid shaft diameter of humerus in male bones was 1.953±0.027 and in female bones was 1.75±0.030. The mean minimum midshaft diameter of humerus in male was 1.657±0.0211 and in female was 1.485±0.026 in the present study Conclusion: The mid shaft diameter can be considered as one of the sex determinations factors due to its higher accuracy in males than females with other predictive variables of humerus.