Documented Gender Differences Research Articles

Gender differences in clinical presentation and management of patients with acute coronary syndrome in Southwest of Saudi Arabia

Objective Gender differences in the clinical presentation and management of patients with acute coronary syndrome (ACS) have been reported in different parts of the world with contradicting results. We aimed at investigating the presence of gender bias in patients admitted with ACS to Aseer Central Hospital (ACH). Methods A retrospective cohort of all consecutive patients admitted to ACH with the diagnosis of ACS, during the period between the 1st of June 2007 and the 31st of May 2009 was studied. Data on demographic and clinical profiles, management and outcomes of ACS patients were collected and compared for both genders. Results The present study included 148 females and 397 males. Females were significantly older than males (62.9 ± 14.2 vs. 60 ± 13.4, respectively, P < 0.03), were less likely ever to have smoked (0.7% vs. 26.2%, respectively, P < 0.001), less likely to have had a history of hyperlipidemia (10.8% vs. 22.2%, respectively, P < 0.003) or family history of ischemic heart disease (10.1% vs. 18.9%, respectively, P < 0.014). Female patients presented more with atypical presentation (42.6% vs. 28.9%, respectively, P < 0.003), more with unstable angina (72.3% vs. 50.4%, respectively, P < 0.001), and less with ST-elevation myocardial infarction (18.9% vs. 40.8%, respectively, P < 0.001). Furthermore, they had significantly lower levels of hemoglobin compared to males (12.9 ± 2.3 vs. 14.5 ± 2.2 g/L, respectively, P < 0.001), and higher levels of high density lipoprotein (1.1 ± 0.4 vs. 0.98 ± 0.4 mmol/L, respectively, P < 0.008). Left ventricular ejection fraction was significantly higher in female patients compared to males (50.9 ± 14 vs. 45.8 ± 14, respectively, P < 0.003). Coronary angiography showed a higher rate of normal findings (29.3% vs. 8.9%, respectively, P < 0.001) and less severe disease (46.7% vs. 60.3%, respectively, P < 0.027) in women, however, they were less likely to undergo invasive revascularization procedures (31% vs. 42.8%, respectively, P < 0.013). No significant differences were found between both sexes regarding in-hospital mortality or re-infarction rates. Conclusion We documented gender differences in both clinical presentation as well as management of patients admitted with ACS to ACH. However, there were no significant differences between both genders regarding the clinical in-hospital outcomes. Emphasis should be made to avoid such bias in the future.

Women are not always less competitive than men: evidence from Come Dine with Me

Are women less competitive than men? Many experimental and nonexperimental studies have documented gender differences in competitiveness. This article presents the results from a study that examines gender differences in competitiveness in the television show Come Dine with Me. It is a cooking show in which amateur chefs compete against each other for a cash prize. The show provides an unusual opportunity to study gender differences in a high-stakes game environment. The results demonstrate that there are no gender differences in competitiveness.

Stereotype Threat Affects Financial Decision Making

The research presented in this article provides the first evidence that one’s decision making can be influenced by concerns about stereotypes and the devaluation of one’s identity. Many studies document gender differences in decision making, and often attribute these differences to innate and stable factors, such as biological and hormonal differences. In three studies, we found that stereotype threat affected decision making and led to gender differences in loss-aversion and risk-aversion behaviors. In Study 1, women subjected to stereotype threat in academic and business settings were more loss averse than both men and women who were not facing the threat of being viewed in light of negative stereotypes. We found no gender differences in loss-aversion behavior in the absence of stereotype threat. In Studies 2a and 2b, we found the same pattern of effects for risk-aversion behavior that we had observed for loss-aversion behavior. In addition, in Study 2b, ego depletion mediated the effects of stereotype threat on women’s decision making. These results suggest that individuals’ decision making can be influenced by stereotype concerns.

Fear of hypoglycaemia in adults with Type 1 diabetes

The aim of this study was to examine the fear of hypoglycaemia and its association with demographic and disease-specific variables in a large and unselective population of adult patients with Type 1 diabetes. Questionnaires were sent by post to all patients with Type 1 diabetes who were identified in the local diabetes registries of two hospitals in Stockholm, Sweden (n=1387). Fear of hypoglycaemia was measured using the Swedish Hypoglycaemia Fear Survey, the Worry subscale and the Aloneness subscale. Demographic variables and disease-specific factors were collected from patients' self reports and medical records. Univariate analysis and multiple stepwise linear regression analysis were used in the statistical analyses of the data. Seven hundred and sixty-four (55%) patients participated in the study (mean age 43.3 years and mean HbA(1c) 7.0%, normal <5.0%). The Hypoglycaemia Fear Survey - Worry subscale was significantly associated with frequency of severe hypoglycaemia, number of symptoms during mild hypoglycaemia, gender, hypoglycaemic symptoms during hyperglycaemia and hypoglycaemic unawareness. The Hypoglycaemia Fear Survey - Aloneness subscale was significantly associated with frequency of severe hypoglycaemia, number of symptoms during mild hypoglycaemia, gender, frequency of mild hypoglycaemia, HbA(1c) , hypoglycaemic unawareness and visits to the emergency room because of severe hypoglycaemia. Fear of hypoglycaemia proved to be more prevalent in females and indicated a different pattern between genders in relation to factors associated with fear of hypoglycaemia. This study identifies the frequency of severe hypoglycaemia as the most important factor associated with fear of hypoglycaemia. Moreover, for the first time, we document gender differences in fear of hypoglycaemia, suggesting that females are more affected by fear of hypoglycaemia than men.

DNA-binding-dependent androgen receptor signaling contributes to gender differences and has physiological actions in males and females

We used our genomic androgen receptor (AR) knockout (ARKO) mouse model, in which the AR is unable to bind DNA to: 1) document gender differences between males and females; 2) identify the genomic (DNA-binding-dependent) AR-mediated actions in males; 3) determine the contribution of genomic AR-mediated actions to these gender differences; and 4) identify physiological genomic AR-mediated actions in females. At 9 weeks of age, control males had higher body, heart and kidney mass, lower spleen mass, and longer and larger bones compared to control females. Compared to control males, ARKO males had lower body and kidney mass, higher splenic mass, and reductions in cortical and trabecular bone. Deletion of the AR in ARKO males abolished the gender differences in heart and cortical bone. Compared with control females, ARKO females had normal body weight, but 14% lower heart mass and heart weight/body weight ratio. Relative kidney mass was also reduced, and relative spleen mass was increased. ARKO females had a significant reduction in cortical bone growth and changes in trabecular architecture, although with no net change in trabecular bone volume. In conclusion, we have shown that androgens acting via the genomic AR signaling pathway mediate, at least in part, the gender differences in body mass, heart, kidney, spleen, and bone, and play a physiological role in the regulation of cardiac, kidney and splenic size, cortical bone growth, and trabecular bone architecture in females.

Gender Differences in Support for Scientific Involvement in U.S. Environmental Policy

Many studies have documented gender differences in attitudes toward and experiences with science. Compared to men, for example, women are less likely to study science and to pursue careers in science-related fields. Given these findings, should we expect gender differences in support for scientific involvement in U.S. environmental policy? This study empirically examines the relationship of gender to attitudes toward science and preferred roles of scientists in environmental policy among various environmental policy participants. Data collected in 2006 and 2007 from national surveys of four different groups involved in environmental policy and management suggest that social context, including education and occupation, shapes the way that gender matters. Specifically, we find that gender is less important among scientists and managers than among interest groups and the general population regarding attitudes toward science and views about preferred roles of scientists in environmental decision making.

Gender and age differences in lean soft tissue mass and sarcopenia among healthy elderly

Sarcopenia, the age related decline in skeletal muscle mass has dramatic consequences. It leads to impaired performance, increased vulnerability, frailty and an increased risk of falls. Various extrinsic and intrinsic factors contribute to the aetiology of sarcopenia. The aims of the present study was to analyse gender differences in the prevalence of sarcopenia and document gender differences in lean soft tissue mass in healthy elderly. 139 healthy subjects ageing between 59 and 92 years (x = 71.5 +/- 7.8), 77 females and 64 males, were enrolled in the study. Body composition was measured by means of dual energy X-ray absorptiometry. Additionally appendicular muscle mass (ASM) was calculated. While no linear decrease in lean soft tissue mass was found for both sexes, the prevalence of sarcopenia increased significantly with increasing age in females as well as in males. Significant gender differences in the prevalence of sarcopenia were found for people younger than 70 years and those older than 80 years. In the youngest age group (< 70 years) sarcopenia was found more frequently among women, while in the oldest age group (> 80 years) the opposite was true. It can be concluded that the prevalence of sarcopenia differs between the two genders however these differences are influenced by age.

Female Athletes Do Ask! An Exploratory Study of Gender Differences in the Propensity to Initiate Negotiation among Athletes

Researchers have extensively documented gender differences in negotiation perceptions and performance which, in turn, may contribute to the persistence of salary and workplace inequity between women and men. The purpose of this study was to determine if these differences existed among a sample of 228 athletes (women n = 151 and men n = 77) who had competed in sport at high school, competitive club, college, or through professional levels for 15 years. More specifically, gender differences in the propensity to initiate negotiation were investigated in order to determine whether the three factors associated with the Babcock, Gelfand, Small, and Stayn (2006) Propensity to Initiate Negotiation Model (i.e., recognition of opportunity, sense of entitlement, and apprehension) explained and mediated such differences. Propensity to initiate negotiation (PIN) was operationally defined as self-reported responses to a series of hypothetical negotiation scenarios, as well as recent and anticipated future negotiation experiences. Females reported significantly more negotiation apprehension than males; they did not differ, however, in their recognition of opportunities and sense of entitlement associated with negotiation. The implications of these findings are discussed.

CTLA-4 single-nucleotide polymorphisms in a Caucasian population with schizophrenia

Associations between a single-nucleotide polymorphism (SNP) in exon 1 of the cytotoxic T-lymphocyte antigen-4 ( CTLA4) gene and schizophrenia in a Korean population have been previously described. The current study investigated whether a similar link occurs in a Caucasian population with schizophrenia. One hundred and twenty-two age- and sex-matched pairs of people with DSM-III-R diagnosis of schizophrenia and healthy controls were included in this study. Three previously described SNPs (from the promoter, exon 1 and 3′ UTR) of the CTLA4 gene were analysed. In the entire sample, we detected no allelic or genotypic association for any of the three SNPs. Given documented gender differences in incidence of schizophrenia, we conducted separate analyses of male and female participants. In males, both the promoter region SNP (−318C/T) and the 3′ UTR SNP demonstrated nominally significant association with schizophrenia. The 3′ UTR SNP remained significant following correction for multiple testing (permuted P = 0.046). In addition, all possible haplogenotypes showed significant association with disease in males with two – both containing the 3′ UTR SNP – remaining significant following correction for the genotypic tests of all SNPs and haplogenotypes in males. These results suggest a role for the 3′ UTR SNP and/or variants in high linkage disequilibrium with this SNP in the pathogenesis of schizophrenia.

Gender impacts the post-exercise substrate and endocrine response in trained runners

BackgroundAlthough several studies have investigated gender differences in the substrate and endocrine responses during and following endurance exercise, few have studied sex differences during a more prolonged recovery period post endurance exercise. The purpose of this study was to compare and characterize the endocrine and substrate profiles of trained male and female adult runners during the three-and-a-half hour recovery period from an endurance run.MethodsAfter consuming a euenergetic diet (1.8 g·kg-1·d-1 protein, 26% fat, 58% carbohydrates, 42.8 ± 1.2 kcal/kg body weight) for 8 days, blood was collected from trained male (n = 6, 21 yrs, 70 kg, 180 cm, 9% body fat, VO2peak 78.0 ± 3.4 mL·kg FFM-1·min-1) and female (n = 6, 23 y, 66 kg, 170 cm, 29% body fat, VO2peak 71.6 ± 4.5 mL·kg FFM-1·min-1) endurance runners at rest and during recovery from a 75 min run at 70% VO2peak. Circulating levels of glucose, lactate, free fatty acids (FFAs), insulin, cortisol, growth hormone (GH), and free insulin-like growth factor I (IGF-I) were measured.ResultsDuring the recovery period, females experienced increases in glucose, lactate and insulin while no changes were noted in men (P < 0.05). Males experienced increases in GH and decreases in IGF-I levels respectively (P < 0.05) while no changes were observed in females. FFA levels increased during recovery from endurance exercise, but changes were not different between genders.ConclusionThese data further document gender differences in substrate and endocrine changes during a prolonged recovery period following endurance exercise. Future studies are needed to evaluate the effect of differing diets and nutritional supplements on these gender-specific post-exercise substrate and endocrine differences.

Gender Differences in Immediate Antecedents of Ad Lib Cigarette Smoking in Smokers with and without Posttraumatic Stress Disorder: A Preliminary Report

Using ambulatory methods for monitoring, this study investigated gender differences regarding the association between smoking and situational cues in 63 smokers with posttraumatic stress disorder (PTSD) and 32 smokers without PTSD. Smokers were instructed to complete a diary entry each time an ambulatory blood pressure monitor took a reading and each time they prepared to smoke. Generalized estimating equations contrasted 682 smoking and 444 nonsmoking situations by group status. For all smokers, ad lib smoking was strongly related to craving. For women with PTSD, ad lib smoking was strongly related to total PTSD symptoms, PTSD reexperiencing symptoms, and PTSD hyperarousal symptoms. For men with PTSD, ad lib smoking was significantly related to negative affect, PTSD reexperiencing symptoms, restlessness, and worry. No other mood antecedents were significant for women or men smokers without PTSD. These results are consistent with previous studies documenting gender differences in smoking behavior, and underscore the importance of examining gender differences in psychiatric samples.

Assessing sex differences and similarities in mate preferences: Above and beyond demand characteristics

Prior experiments documenting gender differences in mate preferences have relied on directive questions (e.g., “How important is physical attractiveness?”), which are susceptible to demand characteristics. To assess this potential confound, this study assessed mate preferences using indirect, openended questions, with anonymous computer administration and designated (same- or opposite-sex) targets. The frequency with which participants noted traits reflected key gender differences predicted by evolutionary accounts; evaluations of men focused more on ambitiousness, whereas evaluations of women focused more on attractiveness. The number of attractiveness comments was also greater, however, if the rated target was of the opposite sex. Kindness and intelligence comments did not show strong gender differences, although kindness-related comments were very frequent overall and particularly frequent from women participants.

Diurnal rhythms (DR) in gene expression in human oral mucosa: Implications for gender differences in toxicity, response and survival and optimal timing of targeted therapy (Rx)

2507 Background: DR in processes relevant to oncology, including cell cycle, apoptosis, and angiogenesis, have been demonstrated (Nat Rev Cancer 3:350, Cancer Res 63:7277). In rodents, 10–20% of the genome has a 24-hour (h) rhythm in RNA expression (Cell 109:307). A molecular clock consisting of transcription/translation feedback loops of clock-genes controls this rhythmicity (Nat Rev Neurosci 4:649). We studied, for the first time, daily whole genome RNA expression patterning in healthy human volunteers. Methods: RNA samples extracted from oral mucosa biopsies (bx) obtained every 4h over 24h (6 bx) from 5 males (M) and 5 females (F) were subjected to microarray analysis (Affymetrix HG_U133_Plus2 chip, 54,679 transcripts). COSOPT, designed for circadian microarray time series analysis (Methods Enzymol 383: 149) was used to detect genes with significant rhythms (pMMC-Beta = 0.1). Expression patterns were visualized in GeneSpring GX7.3 (Agilent) and validated by real-time PCR and ANOVA. Results: There were 801 and 810 rhythmic genes in M and F respectively, with most genes peaking at 4AM or 4PM in M but at 6AM or 11AM in F. Only 90 rhythmic genes (including core clock-genes and clock controlled genes) were common to M and F, with over 700 genes only rhythmic in M and not in F and vice versa. The profiles of clock- genes and clock-controlled genes were inverted relative to the nocturnal rodent data. There were 75 and 67 rhythmic transcription factor genes in M and F respectively, with 28 common to both M and F. There were 71 rhythmic human cancer genes (Nat Rev Cancer 4:177) with significant gender differences. This group includes rhythmic gene products involved in signaling pathways currently targeted for cancer Rx. Conclusions: We show for the first time a significant gender specific DR in gene expression involving multiple genes of interest in oncology. This may contribute to the documented gender differences in toxicity, response and survival (J Clin Onc 24: 3562, NEJM 353:133), and can inform future trials of optimal timing of antisense Rx and other targeted Rx. The inverted DR in rodents vs. humans has implications for translating rodent data to human Rx trials. No significant financial relationships to disclose.

Gender‐of‐author differences in study design of older adult friendship surveys

AbstractThis research extends literature documenting gender differences in choice of quantitative or qualitative methods by examining whether men and women make different decisions regarding study design within one type of quantitative method—survey research. The population consists of 117 surveys (1960–1999) of older adults about friendship. We find that the use of communal methods, especially by women scholars, increased over time, and researchers who are women are more likely to use “communal” survey methods than researchers who are men. The gender difference in use of communal methods is not necessarily explained by essential differences between men and women or even by gender differences in commitment to feminist research as previous scholars have argued; rather, it is possibly explained by structured differences in access to resources to do agentic research.

Gender Differences in Lymphocyte Populations, Plasma HIV RNA Levels, and Disease Progression in a Cohort of Children Born to Women Infected With HIV

We sought to document gender differences in lymphocyte subsets and plasma RNA levels in a pediatric cohort with presumed minimal hormonal differences (on the basis of age). Blood samples from antiretroviral therapy-treated, HIV-infected children (n = 158) and HIV-uninfected children (n = 1801) who were enrolled in the Women and Infants Transmission Study were analyzed at specified study intervals with consensus protocols, and various parameters were compared. Antiretroviral therapy-treated, HIV-infected female children had, on average, 0.38 log10 copies per mL lower plasma RNA levels than did their male counterparts, but lymphocyte differences were not noted in this cohort. Despite their higher plasma RNA level, a greater proportion of male children survived through 8 years of age. There were no gender differences with respect to the age of diagnosis of HIV, time to antiretroviral therapy after diagnosis of HIV, or type of antiretroviral therapy. Lymphocyte differences were noted for uninfected children. Plasma RNA levels differed among antiretroviral therapy-treated, HIV-infected children according to gender, in a manner similar to that noted in previous pediatric and adult studies. Lymphocyte subsets varied according to gender in a cohort of HIV-exposed but uninfected children. Most importantly, overall mortality rates for this cohort differed according to gender.

Gender differences in alcohol and substance use relapse

This review explores gender differences in relapse and characteristics of relapse events in alcohol and substance use. For alcohol, relapse rates were similar across gender. Although negative mood, childhood sexual abuse, alcohol-related self-efficacy, and poorer coping strategies predicted alcohol relapse, gender did not moderate these effects. Gender did moderate the association between marriage and alcohol relapse. For women, marriage and marital stress were risk factors for alcohol relapse; among men, marriage lowered relapse risk. This gender difference in the role of marriage in relapse may be a result of partner differences in problem drinking. Alcoholic women are more likely to be married to heavy drinking partners than are alcoholic men; thus, alcoholic women may be put at risk of relapse by marriage and alcoholic men may be protected by marriage. There are fewer studies documenting gender differences in substance abuse relapse so conclusions are limited and tentative. In contrast to the lack of gender differences in alcohol relapse rates, women appear less likely to experience relapse to substance use, relative to men. Women relapsing to substance use appear to be more sensitive to negative affect and interpersonal problems. Men, in contrast, may be more likely to have positive experiences prior to relapse.

Compulsive buying – a growing concern? An examination of gender, age, and endorsement of materialistic values as predictors

Compulsive buying is an understudied, but growing, dysfunctional consumer behaviour with harmful psychological and financial consequences. Clinical perspectives treat it as a psychiatric disorder, whereas recent proposals emphasize the increasing endorsement of materialistic values as a cause of uncontrolled buying (e.g. Dittmar, 2004b; Kasser & Kanner, 2004). The present research aims to improve understanding of compulsive buying through examining gender, age, and endorsement of materialistic values as key predictors in three UK questionnaire studies, which sampled individuals who had contacted a self-help organization and residentially matched 'controls' (N = 330), consumer panelists from a multinational corporation (N = 250), and 16- to 18-year-old adolescents (N = 195). The results confirmed previously documented gender differences, and showed that younger people are more prone to compulsive buying. The central findings were that materialistic value endorsement emerged as the strongest predictor of individuals' compulsive buying, and that it significantly mediated the observed age differences.

Gender differences in chronic pain—findings from a population-based study of Norwegian adults

The purpose of this study was to evaluate for gender differences in the experience of chronic pain and the impact of chronic pain on quality of life (QOL). A total of 1,912 out of 4,000 Norwegian citizens returned a mailed questionnaire, and 24.4% reported chronic pain. More women than men reported chronic pain, and women reported significantly higher pain intensity scores than men did. Although the duration of chronic pain was similar in women and men, women more often received treatment for their chronic pain. Men in chronic pain reported a poorer QOL than women did. Although specific variables that predicted present pain intensity in women and men differed, the variables that explained the largest percentage of the variance in pain for both genders were the disease and the pain location variables. These findings support previously published studies that document gender differences in chronic pain and extend the work to the impact of chronic pain on QOL.

An Examination of Gender Differences in Adolescent Adjustment: The Effect of Competence on Gender Role Differences in Symptoms of Psychopathology

Numerous studies have documented gender differences in psychopathology; girls generally report more internalizing symptoms and boys generally report more externalizing symptoms. These gender differences are partially accounted for by the gender-typed personality characteristics of boys and girls. This study was designed to investigate how gender roles influence symptoms of psychopathology by examining the mediating effects of self- and peer-rated competencies. Using a multiple regression approach to path analysis with a sample of primarily White, middle-class high school students, gender roles significantly predicted symptoms of psychopathology and mediated the gender differences in those symptoms. In addition, the adolescents' self- and peer-rated competence in various domains helped to explain the effect of gender roles on symptoms of psychopathology. Specifically, self-rated social attractiveness and global self-worth fully mediated the relation between instrumentality (i.e., masculinity) and internalizing symptoms. Global self-worth and both self- and peer-rated achievement/conduct partially mediated the relation between expressivity (i.e., femininity) and externalizing symptoms. Practical and theoretical implications are discussed.

Effects of Gender and Phase of the Menstrual Cycle on the Kinetics of Ranitidine in Healthy Volunteers

The present study was undertaken to determine if differences exist in the pharmacokinetic parameters of oral ranitidine caused by gender and stage of the menstrual cycle. The study was performed in two steps, in the first a pharmacokinetic study was performed on 10 men (average age 35.5 yrs) and 10 women (average age 34.7 yrs) during the follicular phase, and in the second the pharmacokinetic study was performed only on the same women in their luteal phase. Subjects received a tablet dose of 300 mg ranitidine, and blood samples were drawn at several times after its ingestion. Plasma ranitidine concentration was determined by high performance liquid chromatography. Comparison of the pharmacokinetic parameters of women and men revealed statistically significant differences both in distribution volume (Vd) with values of 2.0 and 6.3 l/kg, Area Under Curve (AUC) with values of 7312.15 and 11471.94 ng/ml/h, and clearance (CLt) with values of 0.65 and 0.59 l/kg/h, respectively. Several pharmacokinetic parameters in women were different in the follicular compared to the luteal phase; for example, Vd was 2.0 and 5.6 l/kg, AUC was 7312.15 and 5195.83 ng/ml/h, and CLt was 0.65 and 0.97 l/kg/h, in the respective phases. Moreover, the maximum concentration (Cmax) was 1086 ng/ml in the follicular vs. 864 ng/ml in the luteal phase. The first study detected differences between men and women in several pharmacokinetic parameters, mainly those indicative of drug availability, for example, Vd, AUC, and CLt. Comparison of data obtained in the follicular phase with those obtained in the luteal phase revealed differences in most pharmacokinetic parameters, which is seemingly indicative of the characteristic physiological changes associated with the luteal phase that largely affect the kinetics and availability of drugs such as ranitidine. Although it has been postulated that hormonal fluctuation within the menstrual cycle phase is the primary cause of documented gender differences in the pharmacokinetics and pharmacodynamics of drugs, further study of related factors is required to fully understand how gender and menstrual cycle rhythms affect the pharmacokinetic process in their entirety.