Life with and without disease: women experience more of both

This paper examines gender differences in life with and without six major diseases, including both mortal and morbid conditions. Disease prevalence and health behavior data are from the 1993-1995 National Health Interview Surveys for the United States. Vital registration data are the source of mortality rates used in computing life expectancy. The Sullivan method is used to estimate life lived with and without disease and risky behavior for men and women at various ages. Women live more years with each of the diseases examined, and, for arthritis, the extended years with disease are greatest. Women also live more years than men free of each of these diseases with the exception of arthritis. Gender differences in life without two health-risk behaviors are also discussed. Men spend more years of their lives overweight and have fewer years during which they see a doctor.     

Intermediate variables and educational differentials in fertility in Korea and the Philippines

This analysis compares the effects of contraceptive use and infant and fetal mortality on the pace offertility in Korea and the Philippines and explores the mediating effects of these intermediate variables on educational differentials in childspacing. For birth intervals initiated in a recent period before a sample survey, second, third and higher-order intervals are examined. Transitions within successive segments of interval exposure (q _xvalues) are examined rather than cumulative transitions (1 - l _xvalues). This methodological choice is substantively important because breastfeeding should primarily affect early segments of exposure and because it allows empirical examination of the timing of the effects of other variables such as contraceptive use. Further, this choice allows multivariate analysis within the structure of the life-table perspective. The results show substantial differences in patterns between Korea and the Philippines, indicate clearly the effect of each intermediate variable, and illustrate how educational differentials in fertility are affected by contraception and infant and fetal mortality.     

Disinformation,performed: self-presentation of a Russian IRA account on Twitter

ABSTRACT

How disinformation campaigns operate and how they fit into the broader social communication environment – which has been described as a ‘disinformation order’ [Bennett & Livingston, (2018). The disinformation order: Disruptive communication and the decline of democratic institutions. European Journal of Communication, 33(2), 122–139] – represent critical, ongoing questions for political communication. We offer a thorough analysis of a highly successful disinformation account run by Russia’s Internet Research Agency: the so-called ‘Jenna Abrams’ account. We analyze Abrams’ tweets and other content such as blogposts with qualitative discourse analysis, assisted by quantitative content analysis and metadata analysis. This yields an in-depth understanding of how the IRA team behind the Abrams account presented this persona across multiple platforms and over time. Especially, we describe the techniques used to perform personal authenticity and cultural competence. The performance of personal authenticity was central to her persona building as a likeable American woman, whereas the performance of cultural competence enabled her to infiltrate American conservative communities with resonant messages. Implications for understanding disinformation processes, and how some aspects of the hybrid media system are especially vulnerable to hijacking by bad actors are discussed.     

Impact of Widowhood on Parent–Child Relations: Does Parents' Personality Matter?

The authors evaluated the extent to which the short‐term effect of late life widowhood on parent–child relationships is moderated by 5 personality traits—Extraversion, Agreeableness, Conscientiousness, Emotional Stability, and Openness to Experience—and how these interactive effects differ by gender. Data were from the Changing Lives of Older Couples Study (N = 1,532). The results indicated that the effects of widowhood on positive and negative interactions with children were significantly moderated by Agreeableness, Extraversion, and Openness to Experience. An agreeable personality helped widowed persons receive more positive interactions, whereas Openness to Experience reduced negative interactions. Widowed persons with higher Extraversion reported more negative interactions. Furthermore, moderating effects of Extraversion and Openness to Experience differed by gender; specifically, higher Extraversion scores predicted increased positive interactions with children for widowed women but decreased positive interactions for widowed men. The significant association between Openness to Experience and decreased negative interactions with children was more apparent among men than among women.     

Impact of Having a First Child on Maternal Depressive Symptoms: Does the Birth of a Mother's First Baby Increase Symptoms of Depression in the Mother?

Previous studies on the impact of having a first child on a mother's psychological well‐being has not been extensively examined in Korea. The present study aims to understand how having a first child is associated with a first‐time mother's depressive symptoms when compared with their childless counterparts. A sample of 140 women aged 20–40 years, married, and childless in wave 1 of the Korean National Welfare Panel Study (KOWEPS) was selected. The depressive symptoms of women who became mothers between wave 1 and wave 2 of the study and those who remained childless were compared using CES‐D. Two different types of analytical methods (i.e. pooled OLS, fixed effects model) were employed. The results consistently indicated that Korean mothers were more depressed after the birth of the first child than wives without a child. Employment status and satisfaction of social relationship were associated with women's depression in the fixed effect model. The consistent finding that shows a negative association between having a first child and maternal depressive symptoms provides empirical grounds for the development of prevention and intervention programs for first‐time mothers. Implications of the study findings are discussed.     

A cross-cultural analysis of perception on ageist attitudes between Korean and American social work students

This study examined whether there are differences in ageist attitudes toward a person who is struggling from terminal illness between Korean and American social work major students at the undergraduate level. A total of 137 college students participated in this study: 66 Korean students in South Korea and 71 American students in the United States. The students were given surveys with an identical case but the subject was either a 38-year-old or an 80-year-old woman, and they answered 16 questions regarding their perception of age and death, end-of-life options, assessment and intervention, and values and ethics to care. The finding showed that there were generally negative ageist attitudes among social work students regardless of their cultural background, though there were some differences in their basic ageist attitudes. The findings suggest that social work students at the undergraduate level need more education to resolve their negative ageist attitudes in order to provide effective service for the older population.     

Testing for overdispersion in a censored Poisson regression model

In this article, we investigate the efficiency of score tests for testing a censored Poisson regression model against censored negative binomial regression alternatives. Based on the results of a simulation study, score tests using the normal approximation, underestimate the nominal significance level. To remedy this problem, bootstrap methods are proposed. We find that bootstrap methods keep the significance level close to the nominal one and have greater power uniformly than does the normal approximation for testing the hypothesis.     

Efficient quantile regression for heteroscedastic models

Quantile regression (QR) provides estimates of a range of conditional quantiles. This stands in contrast to traditional regression techniques, which focus on a single conditional mean function. Lee et al. [Regularization of case-specific parameters for robustness and efficiency. Statist Sci. 2012;27(3):350–372] proposed efficient QR by rounding the sharp corner of the loss. The main modification generally involves an asymmetric ?₂ adjustment of the loss function around zero. We extend the idea of ?₂ adjusted QR to linear heterogeneous models. The ?₂ adjustment is constructed to diminish as sample size grows. Conditions to retain consistency properties are also provided.     

Behavior change and the freshman 15: tracking physical activity and dietary patterns in 1st-year university women

OBJECTIVE AND PARTICIPANTS: The authors assessed the stability of diet and physical activity and their relationship to weight changes in first-year university women. METHODS: They collected anthropometric and body composition data from 101 resident women at the beginning of their first year of college and again at 12 months. The authors obtained physical activity and dietary logs 4 times throughout the year. RESULTS: Caloric intake decreased over 12 months in all participants (p = .01). There was little change in physical activity in participants who lost weight (p = .73, d = .18). Those who gained weight experienced a trend toward decreased physical activity (p = .13, d = .38). A significant Time X Group interaction on physical activity (p = .04) suggests that physical activity patterns differed substantially between individuals who gained weight and those who lost weight. CONCLUSIONS: Reduction in physical activity appears to be the defining characteristic in freshman weight gain.     

Comparison of k independent,zero‐heavy lognormal distributions

Lachenbruch ( 1976 , 2001 ) introduced two‐part tests for comparison of two means in zero‐inflated continuous data. We are extending this approach and compare k independent distributions (by comparing their means, either overall or the departure from equal proportion of zeros and equal means of nonzero values) by introducing two tests: a two‐part Wald test and a two‐part likelihood ratio test. If the continuous part of the distributions is lognormal then the proposed two test statistics have asymptotically chi‐square distribution with $2(k-1)$ degrees of freedom. A simulation study was conducted to compare the performance of the proposed tests with several well‐known tests such as ANOVA, Welch ( 1951 ), Brown & Forsythe ( 1974 ), Kruskal–Wallis, and one‐part Wald test proposed by Tu & Zhou ( 1999 ). Results indicate that the proposed tests keep the nominal type I error and have consistently best power among all tests being compared. An application to rainfall data is provided as an example. The Canadian Journal of Statistics 39: 690–702; 2011. © 2011 Statistical Society of Canada