- Proceedings. Biological sciences / The Royal Society
- Published almost 8 years ago
The matrilineal Mosuo of southwest China live in large communal houses where brothers and sisters of three generations live together, and adult males walk to visit their wives only at night; hence males do not reside with their own offspring. This duolocal residence with ‘walking’ or ‘visiting’ marriage is described in only a handful of matrilineal peasant societies. Benefits to women of living with matrilineal kin, who cooperate with child-care, are clear. But why any kinship system can evolve where males invest more in their sister’s offspring than their own is a puzzle for evolutionary anthropologists. Here, we present a new hypothesis for a matrilineal bias in male investment. We argue that, when household resources are communal, relatedness to the whole household matters more than relatedness to individual offspring. We use an inclusive fitness model to show that the more sisters (and other closely related females) co-reside, the more effort males should spend working on their sister’s farm and less on their wife’s farm. The model shows that paternity uncertainty may be a cause of lower overall work rates in males, but it is not likely to be the cause of a matrilineal bias. The bias in work effort towards working on their natal farm, and thus the duolocal residence and ‘visiting marriage’ system, can be understood as maximizing inclusive fitness in circumstances where female kin breed communally.
BACKGROUND: Previous studies have demonstrated that high alcohol consumption is a predictor of divorce. However, there is a lack of studies with prospective data from both spouses. The effects of drinking among husbands versus wives and of concordant versus discordant drinking in couples are therefore unknown. Concordant drinking may lead to increased divorce rates because the malignant effects of heavy drinking are experienced in double doses; alternatively it may lead to marital stability due to partner compatibility. METHODS: All inhabitants in a Norwegian county were invited to participate in a health study. We identified 19,977 married couples where both spouses participated. Respondents provided information on alcohol use and mental distress. Survival analysis was applied to study the risk of divorce over the next 15 years. Demographics and mental distress were used as covariates. RESULTS: Heavy drinking among men (hazard ratio [HR] = 1.39) and women (HR = 1.41) increased the risk of future marital dissolution, even after adjusting for demography (reference group “light drinkers”). The HR for divorce was 1.51 when only the husband was a heavy drinker, while it was 3.07 when only the wife was a heavy drinker. Moreover, there were strong interaction effects: concordant abstainers (HR = 0.40) and concordant heavy drinkers (HR = 0.35) had lower risks of divorce compared to the risk expected from combining the main effects. Nevertheless, couples with 2 heavy drinkers (HR = 1.63) had higher risk of divorce than couples with 2 light drinkers. CONCLUSIONS: This study demonstrated that both the level of alcohol use and compatibility in alcohol use are important predictors of marital dissolution.
Marlise Muñoz was 33 years old and the mother of a 15-month-old when she collapsed on November 26, 2013, from what was later determined to be a massive pulmonary embolism. Initially described as apneic but alive, she was brought to the county hospital where her family was soon told that she was brain dead. Ms. Muñoz and her husband, both emergency medical technicians (EMTs), had discussed their feelings about such situations. So Erik Muñoz felt confident in asserting that his wife would not want continued support. Her other family members agreed, and they requested withdrawal of ventilation and other measures . . .
Violence against women is a major health and human rights problem yet there is little rigorous evidence as to how to reduce it. We take advantage of the randomized roll-out of Ecuador’s cash transfer program to mothers to investigate how an exogenous increase in a woman’s income affects domestic violence. We find that the effect of a cash transfer depends on a woman’s education and on her education relative to her partner’s. Our results show that for women with greater than primary school education a cash transfer significantly decreases psychological violence from her partner. For women with primary school education or less, however, the effect of a cash transfer depends on her education relative to her partner’s. Specifically, the cash transfer significantly increases emotional violence in households where the woman’s education is equal to or more than her partner’s.
Women’s greatest risk of violence in the Democratic Republic of Congo (DRC) may come from an intimate partner, but few studies have analyzed context-specific risk and protective factors for intimate partner violence (IPV) in the DRC. This study analyzed data from the most recent Demographic and Health Survey (DHS) in Congo to assess risk and protective factors for IPV and the role of women’s status, a factor implicated in prior IPV research. Using a sample of 1,821 married or cohabiting women between the ages of 15 and 49, four logistic regression models tested relationships between physical, sexual, emotional, or any violence and independent variables of interest. Results indicated that 68.2% of respondents had experienced at least one of the three types of IPV. An attitude of acceptance toward spousal violence was associated with increased risk for physical and emotional IPV. Women who were the only wife of their husband were half as likely to experience IPV compared with women whose husbands had other wives or women who did not know their husbands' marital status. Partner’s use of alcohol was associated with nearly doubled risk for both physical and sexual IPV. The study’s results indicate that IPV occurs frequently and is justified as acceptable by many women in the DRC. Findings suggest that awareness-raising campaigns may be a helpful intervention and that partner characteristics should be considered when assessing women’s risk for IPV.
Couples' Marijuana Use Is Inversely Related to Their Intimate Partner Violence Over the First 9 Years of Marriage
- Psychology of addictive behaviors : journal of the Society of Psychologists in Addictive Behaviors
- Published over 6 years ago
Research on the association between marijuana use and intimate partner violence (IPV) has generated inconsistent findings, and has been primarily based on cross-sectional data. We examined whether husbands' and wives' marijuana use predicted both husbands' and wives' IPV perpetration over the first 9 years of marriage (Wave 1, n = 634 couples). We also examined moderation by antisocial behavior, the spouse’s marijuana use, and whether IPV was reported during the year before marriage. These predictive associations were calculated using a time-lagged multivariate generalized multilevel model, simultaneously estimating predictors of husband and wife IPV. In fully adjusted models, we found that more frequent marijuana use by husbands and wives predicted less frequent IPV perpetration by husbands. Husbands' marijuana use also predicted less frequent IPV perpetration by wives. Moderation analyses demonstrated that couples in which both spouses used marijuana frequently reported the least frequent IPV perpetration. There was a significant positive association between wives' marijuana use and wives' IPV perpetration, but only among wives who had already reported IPV perpetration during the year before marriage. These findings suggest there may be an overall inverse association between marijuana use and IPV perpetration in newly married couples, although use may be associated with greater risk of perpetration among women with a history of IPV perpetration. (PsycINFO Database Record © 2014 APA, all rights reserved).
Consistent links exist between male and female alcohol intake and intimate partner violence (IPV). However, the nature of the relationship remains unclear. This study explores the temporal relationships between violence and heavy alcohol intake, looking for multi-day patterns. 200 women with a recent history of husband-to-wife abuse from six primary care clinics were asked to complete daily assessments using Interactive Verbal Response (IVR) via telephone for 12 weeks. To identify recurrent strings of activities, we used orbital decomposition. Multi-day patterns were found at the 5-, 7- and 9-day levels, but most represented extensions of 4-day patterns. Overall, consecutive days of male-perpetrated, moderate-severe violence were common. In addition, heavy alcohol intake by the husband was underrepresented on days involving verbal abuse only but overrepresented in consecutive days of such abuse; husband’s alcohol intake preceded his verbal abuse and a sequence of husbandperpetrated verbal abuse followed by mutual abuse followed by wife-perpetrated verbal abuse was noted. No patterns involved heavy alcohol intake by the wife. In conclusion, few patterns involved heavy alcohol intake by men and none by women. Although husband’s heavy alcohol intake may contribute to onset and maintenance of verbal abuse, it plays little role in recurrent patterns of physical violence.
The authors examined associations between marital quality and both general life satisfaction and experienced (momentary) well-being among older husbands and wives, the relative importance of own versus spouse’s marital appraisals for well-being, and the extent to which the association between own marital appraisals and well-being is moderated by spouse’s appraisals. Data are from the 2009 Disability and Use of Time daily diary supplement to the Panel Study of Income Dynamics (N = 722). One’s own marital satisfaction is a sizable and significant correlate of life satisfaction and momentary happiness; associations do not differ significantly by gender. The authors did not find a significant association between spouse’s marital appraisals and own well-being. However, the association between husband’s marital quality and life satisfaction is buoyed when his wife also reports a happy marriage, yet flattened when his wife reports low marital quality. Implications for understanding marital dynamics and well-being in later life are discussed.
The relationship between women’s objective physical attractiveness and their dieting motivations and behaviors may depend upon their social environment-specifically, their romantic partners' attractiveness-such that less attractive women with more attractive partners may be particularly motivated to diet. Theoretically, men’s dieting motivations should not depend on their partners' attractiveness. We tested this possibility using a sample of 223 U.S. newlywed spouses. After completing measures assessing dieting motivations, each participant was photographed; we used those photographs to code spouses' objective facial and body attractiveness. Results demonstrated that own and partner attractiveness interacted to predict only women’s dieting motivations and behaviors. Less attractive wives married to more (versus less) attractive husbands reported more dieting motivations and behaviors. In contrast, men’s dieting motivations were not significantly associated with their own and their partners' attractiveness. These findings highlight the value of adopting a dyadic approach to understanding dieting motivations.
Married couples might be an appropriate target for obesity prevention interventions. In the present study, we aimed to evaluate whether an individual’s risk of obesity is associated with spousal risk of obesity and whether an individual’s change in body mass index (BMI; weight in kilograms divided by height in meters squared) is associated with spousal BMI change. We analyzed data from 3,889 spouse pairs in the Atherosclerosis Risk in Communities Study cohort who were sampled at ages 45-65 years from 1986 to 1989 and followed for up to 25 years. We estimated hazard ratios for incident obesity by whether spouses remained nonobese, became obese, remained obese, or became nonobese. We estimated the association of participants' BMI changes with concurrent spousal BMI changes using linear mixed models. Analyses were stratified by sex. At baseline, 22.6% of men and 24.7% of women were obese. Nonobese participants whose spouses became obese were more likely to become obese themselves (for men, hazard ratio = 1.78, 95% confidence interval: 1.30, 2.43; for women, hazard ratio = 1.89, 95% confidence interval: 1.39, 2.57). With each 1-unit increase in spousal BMI change, women’s BMI change increased by 0.15 (95% confidence interval: 0.13, 0.18) and men’s BMI change increased by 0.10 (95% confidence interval: 0.09, 0.12). Having a spouse become obese nearly doubles one’s risk of becoming obese. Future research should consider exploring the efficacy of obesity prevention interventions in couples.