Biomechanics of knife stab attacks

In the past it has been assumed that the fingerprints of women tend to have "fine" epidermal ridge detail while men have "coarse" ridge detail. Past studies have examined this hypothesis but have not clearly demonstrated if observed differences are statistically significant. The goal of this study is to determine if women have significantly higher ridge density, hence finer epidermal ridge detail, than men by counting ridges that occur within a well defined space. If significant gender differences do exist then the likelihood of inferring gender from given ridge densities will be explored. This study focused on 400 randomly picked ten-print cards representing 400 subjects. The demographic composition of this sample population represents 100 Caucasian males, 100 African American males, 100 Caucasian females and 100 African American females all within the age range of 18-67. Results show that women tend to have a significantly higher ridge density than men and that this trend is upheld in subjects of both Caucasian and African American descent (F = 81.96, P < 0.001). Application of Bayes' theorem suggests that a given fingerprint possessing a ridge density of 11 ridges/25 mm2 or less is most likely to be of male origin. Likewise a fingerprint having a ridge density of 12 ridges/25 mm2 or greater is most likely to be of female origin, regardless of race.     

Topological Variability of Fingerprint Ridge Density in a Sub‐Saharan Population Sample for Application in Personal Identification

Variability in ridge density in a sub‐Saharan population sample was studied by counting ridges in three fingerprint areas (two distal regions, radial and ulnar, and one proximal region) on the epidermal surface of the distal phalanx. Study material was obtained from the fingerprint impressions of 100 male sub‐Saharan subjects aged between 18‐ and 48‐years old. The results were compared with those obtained from a Spanish population sample. Sub‐Saharan males presented lower ridge density than Spanish males in the distal regions (radial and ulnar) of all fingers, whereas differences in the proximal region were only observed on some fingers. Using the differences observed between these populations, the likelihood ratio for inferring membership of one of the populations from a fingerprint of unknown origin was calculated; therefore, a ridge density of 14 or less for both areas (ulnar and radial), support an origin sub‐Saharan versus Spanish population.     

Assessment of the methodology for estimating ridge density in fingerprints and its forensic application

In recent times, some studies have explored the forensic application of dermatoglyphic traits such as the epidermal ridge breadth or ridge density (RD) toward the inference of sex and population from fingerprints of unknown origin, as it has been demonstrated that there exist significant differences of fingerprints between sexes and between populations. Part of the population differences found between these studies could be of methodological nature, due both to the lack of standardisation in the position of the counting area, as well as to the differences in the method used for obtaining the fingerprint. Therefore, the aim of this study was to check whether there are differences between the RD of fingerprints depending on where the counting area is placed and how the fingerprints are obtained. Fingerprints of each finger were obtained from 102 adult Spanish subjects (50 females and 52 males), using two methods (plain and rolled). The ridge density of each fingerprint was assessed in five different areas of the dactylogram: two closer to the core area (one on the radial and the other on the ulnar side), two closer to the outermost area of each of the sides (radial and ulnar), and another one in the proximal region of the fingertip. Regardless of the method used and of the position of the counting area, thumbs and forefingers show a higher RD than middle, ring, and little fingers in both sexes, and females present a higher RD than males in all areas and fingers. In both males and females, RD values on the core region are higher than those on the outer region, irrespective of the technique of fingerprinting used (rolled or plain). Regardless of the sex and location of the count area (core or outer), the rolled fingerprints exhibit RD greater than that of the plain ones in both radial and proximal areas, whereas the trend is inverted in the ulnar area, where rolled fingerprints demonstrate RD lesser than that of the plain ones. Therefore, in order for the results of different studies to be comparable, it is necessary to standardise the position of the count area and to use the same method of obtaining the fingerprint, especially when involving a forensic application.     

Outcome of sex determination from ulnar and radial ridge densities of Brazilians’ fingerprints: Applying an existing method to a new population

Fingerprints do not repeat, varying from region to region on the same fingerprint and from person to person. Using this morphological exclusivity in the individualization of people is considered one of the most reliable methods of identification worldwide. Many populations have been studied with respect to sex determination from fingerprints. In this study, the ridge density from two different areas - ulnar and radial - of the ten fingerprints from 100 Brazilian men and 100 Brazilian women was ascertained and statistically analyzed. The aim was to check whether these characteristics depended on sex to distinguish them categorically. Women had significantly higher ridge density in both areas for the fingers analyzed globally. Sometimes, men and women showed statistically significant differences in hands and fingers. From ulnar and radial ridge densities, this research developed thresholds for sexual discrimination cases of human identification in Brazil.     

Impact of aging on fingerprint ridge density: Anthropometry and forensic implications in sex inference

The variation in the epidermal ridge's width between the sexes, during various growth stages, and among different populations has been previously assessed. However, the changes that occur with aging are barely known.The goal of this study was to analyse the degree of variation in epidermal ridge width due to aging. So that, fingerprint ridge density was estimated to establish their relationship with body and hand size changes that typically occur in adulthood.In this study, a sample of 213 adults of both sexes from a Spanish native population of different age ranges—18–30?years old (“junior” group) and 50–66?years old (“senior” group)—was used. Ridge density was assessed in three counting areas of the distal phalanx of each finger (radial, ulnar, and proximal). Height, weight, and a set of anthropometric measurements for both hands were also taken.Our results show that ridge density is higher in females than males throughout adulthood and decreases with aging in the radial and ulnar areas (as the hands widen) but not in the proximal region. Thus, a relationship between hand dimensions and ridge density was found.The data indicate that aging changes may conceal the recognized sex differences in ridge density, and so a better understanding of the topological variations in the epidermal ridge width throughout the life cycle and the factors involved would facilitate the interpretation of the differences between the sexes and different age groups.     

指纹乳突纹线密度的性别差异初探

目的针对指纹纹线密度在不同性别间是否存在差异进行了研究和探索。方法实验对80个（其中男女各40人）中国汉族人十指纹线密度进行计数,将所得数据通过SPSS软件进行统计分析。结果指纹纹线密度均值男性少于14.5线/25mm2,女性大于等于15线/25mm2。结论男女之间指纹密度存在差异;女性指纹纹线密度较男性高。     

Fingerprint Ridge Density as a Potential Forensic Anthropological Tool for Sex Identification

In cases of partial or poor print recovery and lack of database/suspect print, fingerprint evidence is generally neglected. In light of such constraints, this study was designed to examine whether ridge density can aid in narrowing down the investigation for sex identification. The study was conducted on the right‐hand index digit of 245 males and 246 females belonging to the Punjabis of Delhi region. Five ridge density count areas, namely upper radial, radial, ulnar, upper ulnar, and proximal, were selected and designated. Probability of sex origin was calculated, and stepwise discriminant function analysis was performed to determine the discriminating ability of the selected areas. Females were observed with a significantly higher ridge density than males in all the five areas. Discriminant function analysis and logistic regression exhibited 96.8% and 97.4% accuracy, respectively, in sex identification. Hence, fingerprint ridge density is a potential tool for sex identification, even from partial prints.     

Distribution of the minutiae in the fingerprints of a sample of the Spanish population

One of the fundamental aspects of the process of identification through fingerprints is the comparison of the minutiae between the fingermark obtained at the scene of the crime and the suspect's corresponding finger. There is no scientific basis in this process that allows the use of numerical standards, such as those kept in different countries, to obtain the identification. The recent mistakes made in the field of dactyloscopy, together with the growing rigor and scrutiny that forensic evidence undergoes in the legislative and scientific areas, have resulted in the need to reconsider some of the basic principles that support this discipline. A probabilistic estimation of the evidential value is especially necessary; therefore, it is indispensable to know and quantify the variability of the features used in the identification process. The sample studied for this research was obtained from 100 Caucasian men and 100 Caucasian women from the Spanish population, which amounts to a total of 2000 fingerprints. The different types of minutiae were located, identified, and quantified visually on the fingerprint, in four sectors, and inside and outside of a circle, whose radius cut, perpendicularly, fifteen ridges starting from the center cut of the axes that defined the sectors. According to the results obtained in this study, through dactyloscopic identification, the weight of the evidence of a minutia, such as the ridge endings, with frequencies between 55% and 65%, according to the area and gender evaluated, cannot be the same as that of a bifurcation or convergence, with frequencies of 13-18% or those of other minutiae that show frequencies lower than 3%. The significant differences found in the topological distribution of the endings, bifurcations, and convergences show the need to take into account, for its demonstrational value, the finger area in which they are evaluated. The significant association observed between the types of minutiae and the different fingers revealed a greater frequency of endings on the thumb and index fingers, and bifurcations and convergences on the middle, ring, and little fingers.     

Biological variability of the minutiae in the fingerprints of a sample of the Spanish population

The minutiae, a term coined by Galton to refer to the small peculiarities present along the length of every isolated ridge, or characteristic points, a term used primarily by the Spanish Police Scientists, have an inter- and intrapopulation variability which has not been extensively studied. However, these peculiarities constitute the bases for the fingerprint identification of individuals in the field of criminology. Using the adhesive paper and graphite method, the fingerprints of 200 students, 100 males and 100 females, with ages ranging between 20 and 35, have been taken at the University of Alcala (Madrid). From this sample, the distal phalanx of the index finger of the right hand has been studied. The total count of the minutiae, as well as that of each different type, was made of the entire print area, and inside and outside of a circle with a radius of 18 ridges. The highest frequencies were of ridge endings, followed by bifurcations and convergences, all others appearing with frequencies of lower than 5%. The distribution of the minutiae was not homogeneous for the area of the fingerprint (inside and outside the circle). In the study of minutiae statistically significant differences were found between the sexes, and between the different types of general pattern (arches, loops, and whorls).     

Gender differences in the dispersal of children in northern Sweden and the northern USA in 1850

In the course of time families disperse and kin relationships change. In this study gender differences in spatial dispersion of adult children from their fathers were investigated in two areas of the world in 1850: the Skellefteå region in northern Sweden and the northern part of the USA, both largely rural populations. The results from the Skellefteå region where data on both genders were available were used to estimate gender differences among a native born population in the northern USA where women were often not followed in the sources after marriage. Most adult children resided in the same place as their fathers, but the distances separating relatives were greater in the USA. However, the proportion of adult sons living in the same locality as their fathers was the same in both. More daughters than sons were located elsewhere in Skellefteå and probably also in the USA. Although sisters in Skellefteå joined each other in places separate from their parents, men lived in patrilineal clusters to a greater extent than women due, in part, to patrilineal inheritance and virilocal marriages. Various reasons for these patterns are discussed and their implications for kin networks discussed.     

Gender differences in the dispersal of children in northern Sweden and the northern USA in 1850

In the course of time families disperse and kin relationships change. In this study gender differences in spatial dispersion of adult children from their fathers were investigated in two areas of the world in 1850: the Skellefteå region in northern Sweden and the northern part of the USA, both largely rural populations. The results from the Skellefteå region where data on both genders were available were used to estimate gender differences among a native born population in the northern USA where women were often not followed in the sources after marriage. Most adult children resided in the same place as their fathers, but the distances separating relatives were greater in the USA. However, the proportion of adult sons living in the same locality as their fathers was the same in both. More daughters than sons were located elsewhere in Skellefteå and probably also in the USA. Although sisters in Skellefteå joined each other in places separate from their parents, men lived in patrilineal clusters to a greater extent than women due, in part, to patrilineal inheritance and virilocal marriages. Various reasons for these patterns are discussed and their implications for kin networks discussed.     

Changes in Fingerprints Depending on Physiological Factors

The aim of the study was to determine the effect of gender, body mass index, and time on the width of friction ridge impressions in fingerprints and the content of sweat and sebum forming the print. The research showed that the friction ridge impressions of women are significantly wider than those of men, and this tendency persists throughout the existence of the print. The differences may result from the anatomical structure of the skin, as well as from the use of protective products such as creams, which are used more often by women. The width of friction ridge impression is similar in underweight and overweight people, but greater than in those with normal body weight, and the amount of sweat and sebum increases with body weight. The passage of time significantly reduces both the width of the friction ridge impression and the content of sweat and sebum secretions in the print.     

The effect of gender on violent and nonviolent recidivism: A meta-analysis

A large body of literature has been dedicated to understanding re-offending after release from prison - a phenomenon known as recidivism. A meta-analysis was conducted using fifty- seven published studies on actuarial predictors of both violent and nonviolent recidivism in men and women. The current analysis resulted in 127 effect sizes between violent recidivists and non-recidivists, and sixty-eight effect sizes between violent recidivists with nonviolent recidivists. Several variables (drug/alcohol use, age, and marriage) were predictive of recidivism. Gender differences were also observed. In men, increased violent criminal history was associated with increased violent recidivism. This effect was not true for women. In fact, longer sentences were predictive of violent re-offending in women and not men. Despite limited data on women, pursuing the predictors of recidivism in men and women independently demonstrated that gender differences exist, and supported the need for more data concerning the predictors of recidivism in women.     

Distribution of the minutiae in palmprints: Topological and sexual variability

Palmprints have been systematically less studied than fingerprints, despite being of great use in the identification process. In Spain, they were not included in Automated Fingerprint Identification Systems (AFIS) until 2009. Very few investigations performed within the field of palmprints have assessed the sexual and population variability of the number and distribution of minutiae on its surface, despite the fact that these particularities are the basis for personal identification in forensic science. That is why a study was conducted to assess total, bimanual, and sexual density per morphological regions (superior or distal, thenar, and hypothenar) and per counting areas of 1 cm² on 120 palmprints obtained from 30 male and 30 female individuals of Spanish nationality. Also, the frequency in the location of each type of delta or triradius (a, b, c, d, and t) per count area was calculated. Results have shown a topological variability in the distribution of the density of minutiae, which is similar between sexes and a specular effect between both hands. The most frequent locations of the deltas coincide with areas of high minutiae density. It has also been shown that there are sexual differences in the total number of minutiae, which cannot be due to sexual dimorphism in adult hand size, since minutiae are established at an early stage of fetal development and their number will not change during later postnatal growth. These differences can only be attributed to genetic factors related to sexual determination.     

Conceptualization of Intimate Partner Violence: Exploring Gender Differences Using Concept Mapping

While numerous studies have explored prevalence and determinants of intimate partner violence (IPV), one area that has yet to be sufficiently explored is whether men and women agree on the acts, behaviours, and attitudes that comprise IPV. Through the use of concept mapping, we examined the similarities and differences in the conceptualization of IPV among a diverse sample of men and women. Although men and women conceptualized physical and sexual violence similarly, men tended to rate non-physical behaviors related to control as less important to the definition of IPV than women. Moreover, even when men and women used similar labeling language for grouping of items, the statements included in each cluster were substantially different for non-physically abusive items. A greater understanding of similarities and differences in the conceptualization of IPV by gender can help inform appropriate gender specific IPV intervention and prevention efforts.     

DOES VIOLENCE INVOLVING WOMEN AND INTIMATE PARTNERS HAVE A SPECIAL ETIOLOGY?*

We used data from a survey of inmates who have committed homicide or assault to examine whether men and women who have killed or assaulted their intimate partners are different from other violent offenders. A “gender perspective” implies that intimate partner violence and violence between the sexes have different etiologies than other types of violence, whereas a “violence perspective” implies that they have similar etiologies. Our evidence supports a violence perspective. In general, offenders who attack their partners are similar to other offenders in terms of their prior records, alcohol and drug use, and experiences of abuse. We observed some differences between men who attack women (including their female partners) and other male offenders, but the differences were opposite those predicted by a gender perspective. For example, men who attacked their partners were particularly likely to have been abused by their partners. In addition, men who attacked women were particularly likely to have experienced sexual abuse during childhood and to have been intoxicated at the time of the incident. These results suggest that some well-known predictors of violence are particularly strong predictors of male violence against women and female partners.     

Study of poroscopy among South Indian population

Poroscopy is the term applied to a specialized study of pore structure found on papillary ridges of skin as a means of identification. It comes under level 3 detail of identification and hence is more reliable and accurate. The goal of this study is to estimate the importance of poroscopy for identification of individuals and to determine the gender based on frequency, type, and shape of pores. Left plain thumb prints of 200 individuals (100 men and 100 women) aged between 18 and 60 belonging to South Indian population were observed. The results have shown that women tend to have a significantly higher frequency of pores than men. Number of pores ≤ 8 pores/25 mm(2) is more likely to be of male origin and ≥9 pores/25 mm(2) is more likely to be of female origin. There was no significant sex difference based on type and shape of pores.     

Thoughts on interpersonal violence and lessons learned: fact or fiction

Although interpersonal violence is evident in all strata of society, every geographical area in the country, and across each gender, it takes courage to acknowledge our passivity about the phenomena, particularly when people of color are involved. Thus, the mass incarcerations of African American men and women and data citing the overrepresentation of African American children not being adequately served in the child welfare system are highlighted to address the three questions posed to authors: What have we learned about violence and trauma over two decades? What should be learned over the next 10 years about violence and trauma? What methodologies exist that show promise of affecting a better understanding of violence and trauma?     

Genetic characterization of an X-STR decaplex on the population of Pichincha (Ecuador)

This study reports data of ten X-STR markers (DXS8378; GATA172D05; DXS6809; DXS7132, GATA31E08, DXS9898, DXS7133, DXS7423, DXS9902, DXS6789) in Ecuadorian population from Pichincha (Sierra Region). To achieve these, we selected 100 non-related individuals that had signed informed consent (48 women and 52 men). They were typified using markers previously described by the Spanish and Portuguese ISFG Working Group (GEP-ISFG, 2008) and following their experimental recommendations.