Why women are less likely than men to commit suicide

Major depression forms the background of upwards of half of all suicides. Women are twice as likely as men to experience major depression, yet women are one fourth as likely as men to take their own lives. Current and past explanations of this paradox are built on androcentric assumptions that women are deficient in some way. The reverse may be true where suicide is concerned. Men value independence and decisiveness, and they regard acknowledging a need for help as weakness and avoid it. Women value interdependence, and they consult friends and readily accept help. Women consider decisions in a relationship context, taking many things into consideration, and they feel freer to change their minds. It is argued here that women derive strength and protection from suicide by virtue of specific differences from men. Factors that protect women from suicide are opposite to vulnerability factors in men.     

Women are at greater risk than men for malpositioning of the endotracheal tube after emergent intubation

OBJECTIVES: To investigate the occurrence of endotracheal tube malpositioning after emergent intubation in critically ill adults and to determine the need for a routine postintubation chest radiography to assess endotracheal tube position. DESIGN: Prospective study. SETTING: All adult critical care and acute care units of a 560-bed university teaching hospital. PATIENTS: Study of 297 consecutive intubations (185 intubations in males and 112 intubations in females) in 238 adult patients. METHODS: Emergent endotracheal intubations were performed by resident physicians with supervision from an intensive care unit (ICU) or anesthesia attending physician or an anesthesia resident. After intubation, proper positioning of the endotracheal tube was verified by the intubating physician using clinical criteria, including auscultation of bilateral breath sounds, symmetric chest expansion, and palpation of the endotracheal tube cuff in the suprasternal notch. The endotracheal tube position relative to the lower anterior incisors or alveolar ridge was recorded using the centimeter markings printed on the endotracheal tube. A chest radiograph was obtained after intubation to verify endotracheal tube position. Appropriate endotracheal tube position on chest radiograph was defined as between > 2 and < or = 6 cm above the carina. MEASUREMENTS AND MAIN RESULTS: Of the 297 intubations, 26 were excluded from analysis because a chest radiograph was not obtained or the patient was not of normal stature. For the remaining 271 intubations, 42 (15.5%) endotracheal tubes were inappropriately placed, according to the radiographic assessment. The percentage of malpositioned endotracheal tubes was significantly higher in women than in men (61.9% vs. 38.1%, respectively; chi-square: p < .001). Thirty-three (78.6%) of 42 malpositioned endotracheal tubes were placed < 2 cm from the carina, with the highest occurrence (24/33) of proximal malposition occurring in women. Positioning of endotracheal tubes using the centimeter markings printed on the tube referenced to the lower incisors did not accurately identify malposition as documented by chest radiograph. CONCLUSIONS: Emergent endotracheal intubations result in a significant occurrence of malpositioned endotracheal tubes that are undetected by clinical evaluation. Malpositioning is not detected by routine clinical assessment, but only by chest radiograph. Women are at greater risk than men for endotracheal tube malpositioning after emergent intubation; in women, the endotracheal tube is more likely to be positioned too close to the carina. A chest radiograph for confirmation of endotracheal tube position after emergent intubation should remain the standard of practice.     

Subjective responses to intravenous nicotine: Greater sensitivity in women than in men.

Although approximately 45% of smokers in the United States are women, the influence of sex on nicotine dependence remains incompletely understood. Evidence from preclinical and clinical studies has indicated that there are significant sex differences in nicotine's effects. The authors' goal in this report was to determine whether men and women differ in their acute response to intravenous nicotine, which has not been examined in previous studies. Twelve male and 12 female smokers received saline followed by 0.5 mg/70 kg and 1.0 mg /70 kg nicotine intravenously. In response to nicotine, women, as compared with men, had enhanced ratings for drug strength, head rush, and bad effects. Women and men experienced similar suppression of smoking urges by nicotine as assessed by the Brief Questionnaire on Smoking Urges. Nicotine-induced heart rate and systolic and diastolic blood pressure increases were also similar in magnitude in men and women. The findings, consistent with those of several previous studies, support greater sensitivity of female smokers to some but not all of the subjective effects of nicotine. Further studies are warranted to examine the role of this differential nicotine sensitivity to development of nicotine dependence and response to nicotine replacement treatments in men and women. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Is bronchial hyperresponsiveness more frequent in women than in men? A population-based study

To test the hypothesis that a greater proportion of women than men react to methacholine challenge and investigate the possible reasons for any differences observed, we recruited 495 subjects 20 to 44 yr of age (50.9% male) in Paris and 304 subjects (51.3% male) in Montpellier (France), as part of the European Community Respiratory Health Survey. The proportion of responders (PD20 < or = 4 mg methacholine) was 33.7% in women and 11.9% in men (odds ratio = 3.8; 95% confidence interval = 2.4-6.0) in Paris and 43.2% in women and 29.5% in men (odds ratio = 1.8; 95% confidence interval = 1.1-2.9) in Montpellier. These differences could not be explained by asthma, respiratory symptoms, atopy, or lung function parameters. In stepwise logistic regressions including sex, asthma, and asthma-like symptoms, nasal allergies, atopy, baseline FEV1, FEV1%pred, FVC, and FEV1%FVC, the odds-ratios for the effect of female sex on PD20 < or = 4 mg methacholine were 5.2 (3.0-9.0) in Paris and 2.2 (1.2-3.8) in Montpellier. Reacting to low doses of methacholine (PD20 < or = 0.5 mg) was associated with asthma and atopy in both men and women. In contrast, reacting to doses between 0.5 and 4 mg was associated with asthma and atopy only in men and with heavy tobacco consumption only in women. We conclude that the excess of hyperresponsiveness in women is not due to their having smaller lung size or airway caliber than men and may be related to a greater susceptibility to smoking.     

Are women really more aggressive than men in intimate relationships? Comment on Archer.

J. Archer's (see record 2000-15524-001) conclusion that women engage in slightly more physical aggression than men in intimate relationships but sustain more injuries is reasonable in representative samples. However, his conclusions will provoke negative reactions because they do not fit with the data and belief that men are generally more aggressive than women. In addition, they are incompatible with observations of professionals who serve battered women. Basically, the meta-analytic conclusion about aggression cannot be generalized to samples of physically abusive men and their partners. Nonetheless, the studies reviewed by Archer provide convincing data that physical aggression by women must be taken seriously if there is a sincere desire to prevent partner abuse. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Do men show more rapid age-associated decline in simulated everyday verbal memory than do women?

Recent magnetic resonance imaging (MRI) data suggest that men show more rapid age-associated atrophy of the left hemisphere than do women. To investigate whether a similar pattern occurs for functional decline, the authors tested 417 male–female pairs, aged 17–79 yrs and matched perfectly on age and education, on 3 computer-simulated everyday verbal memory tests: Name–Face Association, First–Last Name Associate Learning, and Grocery List Selective Reminding. Age and gender significantly predicted performance on all 3 tests. By contrast, only 1 of 15 Age?×?Gender interactions was significant, accounting for merely 1% of the test variance. Data suggest that although gender-based differences in rate of left-hemisphere structural decline may occur with normal aging, these apparently do not translate into differential functional decline in simulated everyday verbal memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Marital conflict and endocrine function: Are men really more physiologically affected than women?

This study assessed marital conflict behavior and endocrine function in 90 newlywed couples. Blood samples acquired hourly from 8:00 a.m. through 10:00 p.m. were combined to provide composite daytime values for 3 stress hormones--epinephrine ( EPI ), norepinephrine ( NEPI ), and cortisol -- and 3 related hormones (ACTH, growth hormone, and prolactin). These pooled data provided a window on endocrine function in couples for whom the day included a conflict. For wives, higher probabilities of husband's withdrawal in response to wife's negative behavior were associated with higher NEPI and cortisol levels. In addition, higher frequencies of positive behaviors were associated with lower EPI and higher prolactin levels among wives. Husbands' endocrine data were not associated with behavioral data. These findings are discussed in the context of gender models of marital conflict. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Are women always less aggressive than men? A review of the experimental literature.

Reviews the experimental literature on adult female and male aggression. Commonly held hypotheses that men are almost always more physically aggressive than women and that women display more indirect or displaced aggression were not supported. Evidence of the type of sex differences that sex role stereotypes would predict seemed to appear only in self-report measures of general hostility or aggressiveness. Factors that are related to observed sex differences include sex of the instigator and/or victim of aggression, empathy with the victim, guilt, and aggression anxiety. When aggression is perceived as justified or prosocial and when these other factors are controlled, women may act as aggressively as men. Some evidence suggests that men and women react differentially to external aggressive cues and provocation. What may be anger-provoking for men may be anxiety-provoking for women. The hypothesis that sex differences in aggression are biologically determined was not examined. The present discussion should be viewed as an attempt to lay the groundwork for an understanding of the phenotypic expression of whatever genetic differences may exist. (5 p ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Odors released by stressed rats produce opioid analgesia in unstressed rats.

When unstressed Sprague-Dawley or Long-Evans rats were placed in a chamber containing the odor of a conspecific that had received electric shock, they became analgesic as assessed by the formalin test. During the course of 4 experiments, the odors of nonstressed conspecifics and novel odors produced no such effect. This analgesia was reversed by naltrexone (1 ml/kg). Data suggest that naturalistic stimuli innately associated with aversive environmental events can activate endogenous pain control mechanisms. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Smoking is associated with higher cardiovascular risk in young women than in men: the Tecumseh Blood Pressure Study

Consumers in the United States continue to eat raw or undercooked foods of animal origin despite public health warnings following several well-publicized outbreaks. We investigated an outbreak of Salmonella serotype Typhimurium infection in 158 patients in Wisconsin during the 1994 Christmas holiday period. To determine the vehicle and source of the outbreak, we conducted cohort and case-control studies, and environmental investigations in butcher shop A. Eating raw ground beef purchased from butcher shop A was the only item significantly associated with illness [cohort study: relative risk = 5.8, 95% confidence interval (CI) = 1.5-21.8; case control study: odds ratio = 46.2, 95% CI = 3.8-2751]. Inadequate cleaning and sanitization of the meat grinder in butcher shop A likely resulted in sustained contamination of ground beef during an 8-day interval. Consumer education, coupled with hazard reduction efforts at multiple stages in the food processing chain, will continue to play an important role in the control of foodborne illness.     

Effects of hypothalamic paraventricular nucleus: electrical stimulation produce marked analgesia in rats

The effect of the electrical simulation induced analgesia (ESIA) on the hypothalamic paraventricular nucleus (PVN) was investigated by the paw pressure test, which was used to avoid any tissue damage to the paw of Wistar-SPF/VAF male rats. A stimulating electrode was chronically implanted in the parvocellular (PVN-prv) or magnocellular (PVN-mgn) divisions of the PVN. The ESIA was examined at least 10 days after surgery. The electrical stimulation of the PVN markedly showed analgesia (ESIA), but stimulation of most locations outside the PVN did not produce ESIA. Stimulation threshold for the ESIA was lower from PVN-prv than from PVN-mgn, but neither region was affected by naloxone administration (10 mg/kg, i.p.). These results indicate that the PVN is a part of the pain inhibitory system in the CNS, and show that PVN-ESIA might not be mediated either by opioids or by neuropeptides such as vasopressin.     

Hostility and facial expression in young men and women: Is social regulation more important than negative affect?

Behavioral differences may clarify the link between hostility and health. This study examined facial expression. Seventy-two low- and high-hostile undergraduates underwent the Type A Structured Interview (SI) and a test of social anxiety. Facial behavior was measured with the Facial Action Coding System. Low-hostile participants displayed non-Duchenne smiles more frequently than high-hostile participants during the SI. There were no group differences in the expression of disgust. The results identify differences in the nonverbal behavior of hostile people. Restricted use of non-Duchenne smiles may reflect limited use of appeasement, contributing to uncomfortable interpersonal relations and limited social support. The findings are consistent with a behavioral ecology perspective and suggest that social regulation may be as important as negative affect in determining the consequences of hostility. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Scholastic Aptitude Test "explains" why college men major in science more often than college women.

Used the Scholastic Aptitude Test (SAT) to predict the major field choices of 20,809 undergraduates at 4 large universities. Major field was coded on a science-nonscience continuum, and it could be predicted almost as accurately as GPA. The SAT Mathematics subtest (SAT-M) received virtually all of the weight in the prediction equation. Semi-partial correlation was performed to determine if the aforementioned prediction was a mere artifact of sex differences. Results suggest that (a) mathematical ability is an important determinant of major field choice, and (b) the male-female difference in major field choice is largely mediated by the sex difference in mathematical ability. A remedy is suggested for female underrepresentation in science fields. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Client gender as a process variable in marriage and family therapy: Are women clients interrupted more than men clients?

Influenced by language and therapeutic discourse as well as the feminist critique of marriage and family therapy, the authors conducted research to evaluate conversational power in marriage and family therapy. Research on interruptions has received the most empirical attention, so the authors examined videotaped therapy sessions to see if women clients were interrupted more than men clients. This strategy integrated scholarship on gender and conversation into research on marriage and family therapy process. Multivariate analysis of variance was used to examine the different treatment of women and men clients; gender of therapist was used as a control variable. Results indicated that marriage and family doctoral students interrupted women clients three times more than men clients. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Negotiation strategies for men and women

The ability to negotiate plays a key role in one's professional and personal life. If men and women want to negotiate successfully, they must know the steps of negotiation plus the sex differences when approaching the negotiation process.     

Norms affecting self-disclosure in men and women.

In a study with 128 undergraduates, it was predicted that attributions of mental illness would be based on the extent to which self-disclosure deviates from appropriate sex role behavior for men and women. In support of this hypothesis Ss of both sexes rated a male stimulus person as being better adjusted when he failed to disclose than when he did disclose information about a personal problem. The reverse trend occurred when a female stimulus person was being evaluated; she was seen as better adjusted when she disclosed than when she did not. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The retention of large particles (greater than 2mum) in fibrous filters

A simple method of testing fibrous filters to obtain the grade efficiency curve in the particle size range 2-22 mum is described. Dust collected by the method has been used to measure the retention efficency of model filters and it is shown that there is a maximun in the grade efficency curve. The influence of relative humidity on filter behaviour has been investigated. It is shown that the efficiency of filtration in high particle inertia systems increases with increasing relative humidity. It is considered that the reason for this is an increase in particle-fiber adhesion force.