Variation In Men Research Articles

Sex-Based Differences in the Epidemiology, Clinical Characteristics, and Outcomes Associated with Worsening Heart Failure Events in a Learning Health System

BackgroundDifferences in demographics, risk factors, and clinical characteristics may contribute to variations in men and women in terms of the prevalence, clinical setting, and outcomes associated with worsening heart failure (WHF) events. We sought to describe sex-based differences in the epidemiology, clinical characteristics, and outcomes associated with WHF events across clinical settings. Methods and ResultsWe examined adults diagnosed with HF from 2010 to 2019 within a large, integrated health care delivery system. Electronic health record data were accessed for hospitalizations, emergency department (ED) visits and observation stays, and outpatient encounters. WHF was identified using validated natural language processing algorithms and defined as ≥1 symptom, ≥2 objective findings (including ≥1 sign), and ≥1 change in HF-related therapy. Incidence rates and associated outcomes for WHF were compared across care setting by sex. We identified 1,122,368 unique clinical encounters with a diagnosis code for HF, with 124,479 meeting WHF criteria. These WHF encounters existed among 102,116 patients, of whom 48,543 (47.5%) were women and 53,573 (52.5%) were men. Women experiencing WHF were older and more likely to have HF with preserved ejection fraction compared with men. The clinical settings of WHF were similar among women and men: hospitalizations (36.8% vs 37.7%), ED visits or observation stays (11.8% vs 13.4%), and outpatient encounters (4.4% vs 4.9%). Women had lower odds of 30-day mortality after an index hospitalization (adjusted odds ratio 0.88, 95% confidence interval 0.83–0.93) or ED visit or observation stay (adjusted odds ratio 0.86, 95% confidence interval 0.75–0.98) for WHF. ConclusionsWomen and men contribute similarly to WHF events across diverse clinical settings despite marked differences in age and left ventricular ejection fraction.

Determinants of unhealthy living by gender, age group, and chronic health conditions across districts in Korea using the 2010-2017 Community Health Surveys.

We investigated the prevalence and determinants of unhealthy living by gender, age, and comorbidities across Korean districts. For 806,246 men and 923,260 women from 245 districts who participated in the 2010-2017 Korean Community Health Surveys, risk scores were calculated based on obesity, physical inactivity, smoking, and high-risk alcohol consumption, each scored from 0 (lowest risk) to 2 (highest risk). A risk score ≥4 was defined as indicating unhealthy living, and weighted proportions were calculated for each district. Using multivariate regression, an ecological model including community socioeconomic, interpersonal, and neighborhood factors was examined by gender, age, and comorbidities. The mean age-standardized rate of unhealthy living was 24.05% for men and 4.91% for women (coefficients of variation, 13.94% and 29.51%, respectively). Individuals with chronic diseases more frequently exhibited unhealthy lifestyles. Unhealthy lifestyles were associated with educational attainment (β-coefficients: men, -0.21; women, -0.15), high household income (β=0.08 and 0.03, respectively), pub density (β=0.52 and 0.22, respectively), and fast-food outlet density (β=2.81 and 1.63, respectively). Negative associations were observed with manual labor, social activity participation, and hospital bed density. Unhealthy living was positively associated with living alone among women and with being unemployed among middle-aged men. Access to parks was negatively associated with unhealthy living among young men and women. The ecological model explained 32% of regional variation in men and 41% in women. Improving the neighborhood built and socioeconomic environment may reduce regional disparities in lifestyle behaviors; however, the impacts may vary according to socio-demographic traits and comorbidities.

Gender-Atypical Learning Experiences of Men Reduce Occupational Sex Segregation: Evidence From the Suspension of the Civilian Service in Germany

Occupational sex segregation persists in part because men seldom enter female-dominated occupations. Whereas programs providing women with gender-atypical learning experiences aim to increase female representation in male-dominated domains, similar programs for men—despite their potential to counteract the prevailing lack of men in female-dominated occupations—are rare. In this paper, I investigate whether men’s gender-atypical learning experiences affect their likelihood of entering female-dominated occupations by studying the effect of participation in Germany’s civilian service. The civilian service offered a social-sector alternative to compulsory military service, and its suspension in 2011 induced exogenous variation in men’s gender-atypical learning experiences. Combining register data from Germany’s social security system with data from the German Microcensus shows that men’s likelihood of entering the labor market in female-dominated occupations declined by about 21 percent when the civilian service was suspended. Scaling the estimate by participation in the civilian service indicates that having completed the civilian service increased men’s likelihood of entering female-dominated occupations by about 12 percentage points. This illustrates that programs exposing men to gender-atypical learning experiences can promote occupational integration and could “unstall” the gender revolution.

Descriptive Study of the Idoma People and Pattern of Hand Clasping

Introduction: There are millions of people in the world but no two humans are exactly alike not even identical twins. Genetic variations in man are caused by several environmental factors acting alongside with selection, gene flow, genetic drift and migration. Studies have been done on morphogenetic traits such as the pattern of hand clasping in some parts of Africa and among some tribes in southern region of Nigeria but there is no available data on the pattern of hand clasping among the Idoma tribe of Benue State. Hence, this study aimed to determine the pattern of hand clasping among the Idoma people of Benue State, Nigeria. Materials and Methods: The study was community-based, descriptive, and cross-sectional with a sample size of 401. Data was collected using a closed-ended questionnaire that was administered by an interviewer following an examination of hand clasping pattern. Results and Discussion: The proportion of participants that expressed hand clasping with the left thumb on top was 16.7%, while right thumb on top was 83.3%. There were no significant socio-demographic characteristics among participants (p > 0.05). Conclusions: The study implies that hand clasping with the right thumb on top is a marked characteristic of the people of Idoma and, as such, can be used to identify them amongst other tribes where the identity of the tribes is not known ab initio.

Associations between men's reputations for fathering and their reproductive success among BaYaka foragers in the Congo Basin

It is generally recognized that paternal care is a facultative feature of human cooperative caregiving that helps underpin our evolved life history strategy. Yet, little direct evidence links variation in men's fathering to fitness outcomes. Research in small-scale, subsistence-level societies has focused more on links between fitness and men's social status, which overlaps with paternal care (e.g., hunting prowess/reputation and provisioning) but is distinct. Helping address this gap, we demonstrate linkages between fathers' roles and fitness-related outcomes among the BaYaka, a highly egalitarian Congo Basin forager population. Using measures drawn from community perceptions of men's quality in locally-valued domains of fathering, we find that BaYaka men (N = 31) ranked as better at providing for their families and sharing resources with the community had more living children. We observed a similar pattern for men ranked as better teachers, though evidence from Bayesian regression models was weaker than for these other domains. Those men ranked higher for provisioning and sharing, respectively, also had more total children (living and deceased combined). These fathering qualities were not significantly associated with variation in child mortality. Our results are consistent with long-standing arguments around the evolutionary importance of provisioning as paternal care, and point to other pathways, such as resource sharing, through which higher quality paternal care can be linked to reproductive success.

When Is Masculinity "Fragile"? An Expectancy-Discrepancy-Threat Model of Masculine Identity.

Manhood is a precarious social status. Under perceived gender identity threat, men are disproportionately likely to enact certain stereotype-consistent responses such as aggression to maintain their gender status. Yet less is known regarding individual variation in men's threat responsiveness-that is, the psychological conditions under which one's masculine identity is more or less "fragile." We propose a novel model of masculine identity whereby masculine norm expectancy generates discrepancy within the self to the extent that rigid norms are internalized as obligational (actual-ought discrepancy) versus aspirational (actual-ideal discrepancy), which predict extrinsic versus intrinsic motivations to reduce these discrepancies, respectively. Under threat, then, extrinsic motivations predict externalized responses (e.g., aggression), and intrinsic motivations elicit internalized responses (e.g., anxiety, shame, self-harm). We also consider the conditions under which masculinity may be less fragile-for example, in contexts with less rigid expectations and among men who reject expectations-as pathways to mitigate adverse masculinity threat-related outcomes. In many cultures, men prove their manhood by engaging in behaviors that harm themselves and others (e.g., violence, sexism, homophobia), particularly people from marginalized groups. Yet less is known about why some men are more likely than others to enact these masculinity-proving behaviors. The goal of our model is to specify certain conditions under which masculinities become "fragile" and elicit these responses when under threat. We start by describing the rigid expectations men experience-for example, that they are strong and tough. We propose that these expectations cause men to experience different forms of discrepancy within themselves that produce corresponding motivations to reduce these discrepancies. Under threat, motivations driven by others' expectations elicit outward attempts to restore masculine status (e.g., aggression), whereas motivations driven by self-ideals cause internalized responses (e.g., shame, self-harm). We conclude by discussing how to reduce these discrepancies, such as mitigating the rigidity of and encouraging men's resistance to masculinity expectations.

Chromosomal Heteromorphisms and Cancer Susceptibility Revisited.

Chromosomal heteromorphisms (CHs) are a part of genetic variation in man. The past literature largely posited whether CHs could be correlated with the development of malignancies. While this possibility seemed closed by end of the 1990s, recent data have raised the question again on the potential influences of repetitive DNA elements, the main components of CHs, in cancer susceptibility. Such new evidence for a potential role of CHs in cancer can be found in the following observations: (i) amplification and/or epigenetic alterations of CHs are routinely reported in tumors; (ii) the expression of CH-derived RNA in embryonal and other cells under stress, including cancer cells; (iii) the expression of parts of CH-DNA as long noncoding RNAs; plus (iv) theories that suggest a possible application of the “two-hit model” for euchromatic copy number variants (CNVs). Herein, these points are discussed in detail, which leads to the conclusion that CHs are by far not given sufficient consideration in routine cytogenetic analysis, e.g., leukemias and lymphomas, and need more attention in future research settings including solid tumors. This heightened focus may only be achieved by approaches other than standard sequencing or chromosomal microarrays, as these techniques are at a minimum impaired in their ability to detect, if not blind to, (highly) repetitive DNA sequences.

Multimodality Imaging in the Detection of Ischemic Heart Disease in Women.

Women with coronary artery disease tend to have a worse short and long-term prognosis relative to men and the incidence of atherosclerotic cardiovascular disease is increasing. Women are less likely to present with classic anginal symptoms when compared with men and more likely to be misdiagnosed. Several non-invasive imaging modalities are available for diagnosing ischemic heart disease in women and many of these modalities can also assist with prognostication and help to guide management. Selection of the optimal imaging modality to evaluate women with possible ischemic heart disease is a scenario which clinicians often encounter. Earlier modalities such as exercise treadmill testing demonstrate significant performance variation in men and women, while newer modalities such as coronary CT angiography, myocardial perfusion imaging and cardiac magnetic resonance imaging are highly specific and sensitive for the detection of ischemia and coronary artery disease with greater parity between sexes. Individual factors, availability, diagnostic performance, and female-specific considerations such as pregnancy status may influence the decision to select one modality over another. Emerging techniques such as strain rate imaging, CT-myocardial perfusion imaging and cardiac magnetic resonance imaging present additional options for diagnosing ischemia and coronary microvascular dysfunction.

Analysis of copy number variation in men with non-obstructive azoospermia.

Recent findings demonstrate that single nucleotide variants can cause non-obstructive azoospermia (NOA). In contrast, copy number variants (CNVs) were only analysed in few studies in infertile men. Some have reported a higher prevalence of CNVs in infertile versus fertile men. This study aimed to elucidate if CNVs are associated with NOA. We performed array-based comparative genomic hybridisation (aCGH) in 37 men with meiotic arrest, 194 men with Sertoli cell-only phenotype, and 21 control men. We filtered our data for deletions affecting genes and prioritised the affected genes according to the literature search. Prevalence of CNVs was compared between all groups. Exome data of 2,030 men were screened to detect further genetic variants in prioritised genes. Modelling was performed for the protein encoded by the novel candidate gene TEKT5 and we stained for TEKT5 in human testicular tissue. We determined the cause of infertility in two individuals with homozygous deletions of SYCE1 and in one individual with a heterozygous deletion of SYCE1 combined with a likely pathogenic missense variant on the second allele. We detected heterozygous deletions affecting MLH3, EIF2B2, SLX4, CLPP and TEKT5, in one subject each. CNVs were not detected more frequently in infertile men compared with controls. While SYCE1 and MLH3 encode known meiosis-specific proteins, much less is known about the proteins encoded by the other identified candidate genes, warranting further analyses. We were able to identify the cause of infertility in one out of the 231 infertile men by aCGH and in two men by using exome sequencing data. As aCGH and exome sequencing are both expensive methods, combining both in a clinical routine is not an effective strategy. Instead, using CNV calling from exome data has recently become more precise, potentially making aCGH dispensable.

Facing Change: Gender and Climate Change Attitudes Worldwide

Gender differences in concern about climate change are highly correlated with economic development: when countries are wealthier, a gap emerges whereby women are more likely than men to express concern about our changing climate. These differences stem from cross-national variation in men’s attitudes. Men, more than women, tend to be less concerned about climate change when countries are wealthier. This article develops a new theory about the perceived costs and benefits of climate mitigation policy to explain this pattern. At the country level, the perceived benefits of mitigation tend to decrease with economic development, whereas the perceived costs increase. At the individual level, the perceived costs of mitigation tend to increase with economic development for men more than for women. Evidence from existing surveys from every world region, an original 10-country survey in the Americas and Europe, and focus groups in Peru and the United States support the theory.

Sense of coherence and students’ adverse life events. Do the adversities enhance?

Objective – The aim of the study was to: 1) describe the range and the intensity of adverse events in the student’s life, and 2) determine relationships between selected characteristics of adverse events experienced by students, sense of coherence and effective solution of adverse event. It was assumed that there are four results of adverse event: resistance, recovery, thriving and worsening. The consequences of adverse life events can be destructive but sometimes brings some profits. Methods – 239 high school students participated in the study (54% women). They responded to questionnaires measuring sense of coherence (SOC-29) and “Adverse events in your life” describing 14 adverse life events in the last year. Results – Adverse life events were often experienced in the last year. Thriving was the result of four adverse events. Stepwise regression analyses (37% of explained variation in men and 29% in women) showed that differentiation of successfully going through an adverse life event was explained to the largest extent by sense of meaningfulness in women (β = 0.39), while in men, by sense of manageability (β = 0.56). Conclusions – Results indicate that sense of coherence is an important variable for successful coping with adverse life event.

No diurnal variation is present in maximal fat oxidation during exercise in young healthy women: A cross-over study

ABSTRACT Maximal fat oxidation during exercise (MFO) and the intensity that elicits MFO (Fatmax) seems to show a diurnal variation in men, which favours an increased performance in the afternoon than the morning. At present, it remains unknown whether the observed MFO and Fatmax diurnal variation in men is also present in women. Therefore, the current study examined the diurnal variations of MFO and Fatmax in women. Nineteen healthy women (age: 26.9 ± 8.7 years, maximum oxygen uptake: 39.8 ± 6.5 ml/kg/min) participated in the study. MFO and Fatmax were determined by a graded exercise test in cycloergometer using a cross-over design performed on two separate daytime schedules, one conducted in the morning (8am–11am) and one in the afternoon (5pm–8pm). Stoichiometric equations were used to calculate fat oxidation rates. There were no significant differences between MFO-morning and MFO-afternoon (0.24 ± 0.10 vs. 0.23 ± 0.07 g/min, respectively; P = 0.681). Similarly, there was no significant differences between Fatmax-morning and Fatmax-afternoon (41.1 ± 4.7 vs. 42.6 ± 5.5% of maximal oxygen uptake, respectively; P = 0.305). These results persisted after controlling for fat mass percentage (all P > 0.5). In summary, the main finding of the present study was that MFO and Fatmax were similar independent of the time-of-day when the exercise test is performed in healthy women. These results have important clinical implications since they suggest that, in contrast to what was found in men, MFO and Fatmax show similar rates during the course of the day in women. Highlights MFO and Fatmax were similar during the afternoon and morning in young healthy women. Our results suggest that, in women, it does not matter when endurance exercise is performed in term of fat metabolism during exercise.

The Relationship Between Perceived Confidence, Gender, and Writing in a Biomedical Engineering Research Experience for Undergraduates Site.

Women frequently feel alienated in science, technology, engineering, and mathematics (STEM) environments due to gender biases, ultimately leading them to feel less competent or leave the field altogether. This study utilizes personal statements from a subset of participants from a National Science Foundation (NSF) funded Research Experiences for Undergraduates (REU) Site: Biomedical Engineering in Simulations, Imaging, and Modeling (BME-SIM) to investigate how confidence is shown by participants and how confidence is perceived by faculty reviewers in personal statements. This study compares feedback from faculty reviewers to perceived and self-reported confidence using lexical (i.e., word choices and use) and syntactic (i.e., structures of language segments such as sentences, phrases, and organization of words) features of these personal statements. Women received more negative feedback related to confidence compared to their male counterparts, notably in relation to modesty. Few differences were found between writing styles of genders in their pre- and post-program statements. Overall, writing styles did not seem to correlate with the genders' perceived or self-reported confidence; however, perception of confidence suggested a relationship between genders' pre- and post-program statements when examined by noun and adjective variation. A similar relationship was found between self-reported confidence and noun variation in men and women participants. Findings suggest that writing style perceptions and practices may be influenced by gender norms; however, without looking at the specific diction and content of personal statements, these conclusions cannot be fully established.

Replicating a study of women and men in state government administration 30 years later

PurposeThe purpose of this study is to examine data from a 2016 replication of a 1986 study of upper-level administrators in government agencies in the US State of Utah. The unique cultural context of this state is used to challenge Hakim’s preference theory; specifically, that the individual agency of work-oriented women is stronger than structural constraints, including culture. This study joins others that have questioned the preference theory’s applicability in certain cultural contexts.Design/methodology/approachA simple approach using difference-of-means t-tests shows that female respondents in 2016 are more like their male contemporaries than they are to their sister administrators 30 years prior. T-tests are also used to compare male respondents in 1986 and 2016.FindingsWomen in upper management in 2016 are more likely to be married and have preschool-aged children at home than they were in 1986. These results suggest that women are succeeding at the highest levels in state government administration and also adhering to strong cultural norms. Women’s views on labor market policies changed over time, as well. While women in 2016 are found to resemble their male counterparts in 2016 more than they resemble female respondents in 1986, variations in men’s responses in 1986 and 2016 are statistically no different from zero.Originality/valueThis study challenges the predictions of Hakim’s preference theory in the context of strong cultural norms that dictate separate gender roles. The results contradict the preference theory’s predictions and are consistent with critiques of its applicability across cultural contexts.

Glomerular filtration rate seasonal variations in men under 60 years old within acute and subacute period of myocardial infarction

The aim . Evaluation of renal function variations during different year seasons in men under 60 years old within acute and subacute phases of myocardial infarction (MI) to prevent dysfunction and enhance forecasting. Patients and methods . Examination and treatment results analyses of 412 men with MI under 60 y.o. for the period of 2000-2015 who had 30-59 mL/ min/1,73 m 2 calculated glomerular filtration rate (GFR, CKD-EPI 2009, modification 2011) at the end of the third week from the disease onset (61 patients) and more than 60 mL/min/1,73 m 2 respective-ly (315 patients) had been conducted. Renal function changes were assessed during treatment in the first 48 hours and at the end of the third week from the MI onset in patients groups that were combined aligning to the climatic seasons of the year founded on average daily air tem-perature of St. Petersburg, Russia changes. Variations of renal dysfunction (RD) development simulation in different year seasons corresponding to the end of the third week of the disease were conducted with the use of classification trees methodology. Results. Reliable evidence of creatinine and GFR level changes depending on the seasonal variances have been identified for the early periods of the MI development. An ef-fective prognostic algorithm with efficiency as high as 62 % for patients risk groups separation among men under 60 y.o. with MI potent to RD development at the end of the third week of disease was created. Conclusions . Higher creatinine levels and low levels of GFR in men under 60 y.o. with MI are being observed in spring and winter. The risk group for RD development at the end of the MI subacute period represents smokers in summer and autumn; chronic heart failure history patients in winter; patients with diastolic arterial blood pressure in the MI acute period of 90 mm Hg and more in spring. Prescription of medicinal products with nephroprotective features starting from the first hours of MI development in this group of pa-tients is beneficial.

Pacing in World-Class Age Group Swimmers in 200 and 400 m Individual Medley.

The present research investigated pacing for world-class age group swimmers competing in individual medley in 200 m and 400 m. Data on 3,242 unique finishers (1,475 women and 1,767 men) competing in four Master World Championships [XV FINA WMC held in Montreal (Canada) in 2014, the XVI FINA WMC held in Kazan (RUS) in 2015, the FINA WMC held in Budapest (HUN) in 2017, and the XVIII FINA WMC held in Gwangju (KOR] in 2019) were analyzed. Men were faster than women among all age groups in both 200 and 400 m. Additionally, differences were found between almost all adjacent age groups, with the exception (p > 0.05) of age groups 25–29 to 30–34, 35–39 to 40–44 years in 200 m races and 25–29 to 30–34, 30–34 to 35–39, 35–39 to 40–44, and 45–49 to 50–54 years in 400 m races. Men showed a higher pacing variation in 200 m among all male age groups and all female age groups up to 69 years. Pace-variation pairwise comparisons between men and women showed no consistencies throughout age groups, with the exception of a higher variation in men in age groups ≥55-year-old. Men were faster for all splits and strokes in both 200 and 400 m, and significant changes were identified for each split and stroke for both men and women in both 200 and 400 m. Front crawl (freestyle, 4th split) was the fastest butterfly (1st split), backstroke (2nd split), and breaststroke (3rd split). In summary, men were faster than women for all age groups in both 200 and 400 m. Men showed a higher pacing variation in 200 m in all age groups, where women had a higher variation in age groups up to 69 years. The fastest stroke for the final spurt was front crawl, followed by butterfly, backstroke, and breaststroke. Based on these findings, coaches should advise their master athletes to focus on the final spurt in both 200 and 400 m individual medley for a fast final race time.

The gender gap in support for humanitarian interventions

Much of the existing literature on the gender gap in support for war has focused on average differences between men and women. Little research has focused on variations in men’s and women’s support due to differing aspects of the situational context, such as regime change, economic interests, threat of terrorism, or humanitarian crisis. Previous research has suggested that gender differences are reduced when the objective of a military intervention is to promote human rights and stop a humanitarian crisis (Brooks and Valentino 2011; Eichenberg 2016, 2017), but the underlying reason for this finding remains elusive. In this article, I seek precisely such an explanation—values. Using original data from an experiment, I find that different values, such as militaristic and humanitarian values, mediate the gender gap, depending on the reason for intervention. These results add to the accumulation of knowledge on foreign policy attitudes, the gender gap, and values.

Exploration of factors influencing men’s attitude toward women empowerment in Zambia

ABSTRACT The study explored factors associated with men’s attitude toward the empowerment of women in Zambia using Multiple and Logistic regression analyses on a total subsample of 6705 men who participated in 2018 Zambia Demography and Health Survey. The findings revealed that region, education level, work status, marital status, and age are better predictors of men’s attitude toward women empowerment, explaining about 8% of variations in men’s attitudes toward violence against women and women involvement in decision making and about 28% toward women ownership of property. The results contribute to empowerment literature and nongovernmental organisations advocating for women empowerment.

Increased nocturnal arterial pulsation frequencies of obstructive sleep apnoea patients is associated with an increased number of lapses in a psychomotor vigilance task.

ObjectivesBesides hypoxaemia severity, heart rate variability has been linked to cognitive decline in obstructive sleep apnoea (OSA) patients. Thus, our aim was to examine whether the frequency domain features of a nocturnal photoplethysmogram (PPG) can be linked to poor performance in the psychomotor vigilance task (PVT).MethodsPPG signals from 567 suspected OSA patients, extracted from Type 1 diagnostic polysomnography, and corresponding results of PVT were retrospectively examined. The frequency content of complete PPGs was determined, and analyses were conducted separately for men (n=327) and women (n=240). Patients were grouped into PVT performance quartiles based on the number of lapses (reaction times ≥500 ms) and within-test variation in reaction times. The best-performing (Q1) and worst-performing (Q4) quartiles were compared due the lack of clinical thresholds in PVT.ResultsWe found that the increase in arterial pulsation frequency (APF) in both men and women was associated with a higher number of lapses. Higher APF was also associated with higher within-test variation in men, but not in women. Median APF (β=0.27, p=0.01), time spent under 90% saturation (β=0.05, p<0.01), female sex (β=1.29, p<0.01), older age (β=0.03, p<0.01) and subjective sleepiness (β=0.07, p<0.01) were significant predictors of belonging to Q4 based on lapses. Only female sex (β=0.75, p<0.01) and depression (β=0.91, p<0.02) were significant predictors of belonging to Q4 based on the within-test variation.ConclusionsIn conclusion, increased APF in PPG provides a possible polysomnography indicator for deteriorated vigilance especially in male OSA patients. This finding highlights the connection between cardiorespiratory regulation, vigilance and OSA. However, our results indicate substantial sex-dependent differences that warrant further prospective studies.

Cross-Cultural Variation in Men’s Beardedness

To test whether cross-cultural variation in men’s facial hair conforms to patterns predicted by processes of inter-sexual and intra-sexual selection. Data were taken from the PEW Research Center’s World’s Muslims’ project that collected information from 14,032 men from 25 countries. An Independent Factor Analysis was used to analyse how suites of demographic factors predict men’s beardedness. Analyses replicated those from past research using the PEW data, showing that beardedness was more frequent under prevailing conditions of lower health and higher economic disparity. These findings contribute to evidence that men’s decision to augment their masculinity via full beardedness occurs under conditions characterised by stronger inter-sexual and intra-sexual selection.