Comparability of the 6-min walk test using different test configurations

The 6-min walk test (6MWT) is a common component of fitness assessments of older adults; however, differing course configurations might affect 6MWT performance. It is unclear how comparable 2 different configurations are. To determine the comparability of 2 courses, 35 adults >65 years of age completed two 6MWT, once walking around a 20- by 5-yd outdoor rectangle and once on an indoor oval track (circumference 144.3 yd). Scores for the 2 tests were internally consistent (intraclass correlation coefficient = .95). The participants walked farther on the oval track than around the rectangle (639 +/- 19 vs. 582 +/- 16 yd; p < .0001), but responses to the rectangular configuration could be readily estimated using the equation 66.7 yd + 0.807 x (oval walking distance), R2 = .85. Thus, within-participant responses are similar across both 6MWT, but the course configuration affects the distance walked.     

What the pregnancy test is testing

Is the test result positive or negative? Tests that occur in labs and doctors’ offices pose specific questions to try to obtain specific information. But what happens in the social world when these tests never see the inside of a lab or doctor's office, and instead they are used in a house, in a Walmart bathroom, or in a dormitory bathroom stall? Putting the diagnosis aside, what does the presence of these tests do to social life? This paper examines one such test, the home pregnancy test, and specifically, its use in contemporary intimate life of people who do not want to be pregnant. Pregnancy tests test for pregnancy. But what else is the pregnancy test putting to the test? To investigate this, I spent 8 years studying American pregnancy tests using a qualitative mixed methods approach. This paper draws on some of my research materials, specifically, 85 life history interviews. Each participant was asked to recall, in full, all of their experiences with home pregnancy tests throughout their lives, resulting in well over 300 narratives of home pregnancy test usage which I qualitatively analyzed. I find that more than just a test for a pregnancy, the use of the home pregnancy test is a test of roles, relationships, and responsibilities in social life. These findings suggest implications for social life as more biomedical tests move out of the purview of the medical establishment.     

Reflecting emotions: The movement-mirroring test

This study tests the ability to mirror emotions by having second-year social work students and first-and second-year dance therapy students duplicate a videotape of a person expressing sadness, anger, and happiness. The ability to mirror is then compared to imaginative, expressive, and observational skills. Movement mirroring was found to correlate positively with, and was predictive of, observational skills. Mirroring was found not to be related to expressivity and the relationship between mirroring and imagination was unclear. Dance therapy students performed significantly better than social work students on the Movement-Mirroring Test, however, training did not improve their scores.     

QAP partialling as a test of spuriousness

A test of spuriousness for structural data is proposed. Partials are calculated using OLS estimates. The test of significance is based on Hubert's QAP, a nonparametric permutation test. Results of Monte Carlo simulations indicate that statistical bias and efficiency characteristics of this procedure are very reasonable     

Propensity scores: an introduction and experimental test

Propensity score analysis is a relatively recent statistical innovation that is useful in the analysis of data from quasi-experiments. The goal of propensity score analysis is to balance two non-equivalent groups on observed covariates to get more accurate estimates of the effects of a treatment on which the two groups differ. This article presents a general introduction to propensity score analysis, provides an example using data from a quasi-experiment compared to a benchmark randomized experiment, offers practical advice about how to do such analyses, and discusses some limitations of the approach. It also presents the first detailed instructions to appear in the literature on how to use classification tree analysis and bagging for classification trees in the construction of propensity scores. The latter two examples serve as an introduction for researchers interested in computing propensity scores using more complex classification algorithms known as ensemble methods.     

学生考试焦虑的相关因素研究综述

考试焦虑是指个体面对考试情境产生的以担心、紧张或忧虑为基本特征的复杂的情绪反应状态.它是由多种因素相互作用形成的,其焦虑水平也受多方面因素的制约.影响学生考试焦虑的相关因素主要包括自身、家庭和学校等方面.本文旨在对这些方面的研究成果做一综述,为维护和增进学生心理健康提供科学依据.     

Angry drivers: a test of state-trait theory

Tested hypotheses from state-trait theory applied to anger while driving. College student drivers high in trait driving anger were compared to drivers low in trait driving anger. High anger drivers were more frequently angered in day-to-day driving (frequency hypothesis). They reported more intense anger in their most angering driving situations, when visualizing provocative driving events, and in day-to-day driving (intensity hypothesis). Driving diaries and surveys showed they engaged in more aggressive behavior and expressed their anger through more verbal, physical, and vehicular means (aggression hypothesis). They reported handling of their anger less well when visualizing provocative events and on the Adaptive/Constructive Expression scale (reduced adaptive expression hypothesis). They engaged in risky behavior (risky behavior hypothesis) and experienced more moving violations, close calls, and losses of concentration, but not more major or minor accidents (partial support for crash-related outcomes hypothesis). High anger drivers were more generally angry and impulsive and employed more negative, less controlled forms of general anger expression. Results supported state-trait theory and added to the literature showing that high anger drivers have some other psychological and behavioral characteristics that may interact negatively with anger behind the wheel.     

SAMHSA urges treatment programs to test for HIV

Last month, the federal Substance Abuse and Mental Health Services Administration (SAMHSA) called on public health and substance use disorder (SUD) treatment providers to help make sure patients who are negative for human immunodeficiency virus (HIV) stay that way, and that those who are HIV‐positive are tested, receive antiretroviral treatment and stay “adherent” to the treatment. The directive came in the form of a “Dear Colleague Letter” from SAMHSA Director Elinore F. McCance‐Katz, M.D., Ph.D., assistant secretary for mental health and substance use for the Department of Health and Human Services.     

Gender bias in job referrals: An experimental test

Employee referral programs, while efficient for the employer, have been shown to amplify sex-based occupational segregation in labor markets because of the tendency of workers to refer people of the same gender. We implement a controlled laboratory experiment that precludes any concern for network composition or reputation effects in referral choice. In this way, our experimental design allows us to disentangle statistical discrimination, preferences, and implicit same-gender bias. Our data suggest that women tend to favor women when choosing a candidate, whereas men do not attach much importance to the gender of potential candidates. We deduce from our various treatments that same-gender referrals are mainly driven by preferences in competitive environments and implicit same-gender bias in cooperative environments. Our findings add to the existing literature by highlighting that gendered networks alone fail to explain the observed gender homophily in referred-referrer pairs.     

The use of pregnancy test kits by college students

The self-testing product market is experiencing tremendous growth. Technical breakthroughs are allowing tests to be conducted in the home that at one time were possible only in a clinical laboratory. One of the more rapidly expanding components of the self-testing market is home pregnancy test kits. We conducted a study to obtain information about the use of home pregnancy test kits by college students. Questionnaires were distributed to 1,000 women entering the student health service between October 1 and November 4, 1987. A total of 761 (76.1%) questionnaires were completed and returned. Results indicated that approximately 1 out of 6 respondents (17.2%) had used a pregnancy test kit at least once. Of those who had used a test kit, the majority did so because of the speed or confidentiality of obtaining results. The magnitude of test kit use by this sample suggests that college women should be encouraged to use self-testing products as a supplement to but not as a substitute for professional medical care.     

Swinging: A replication and test of a theory

Traditional sex‐role stereotypes suggest that men and women engage in sex for different reasons. Previous studies have supported the notion that women are more motivated by emotional expression in having sex, and men are more concerned with physical gratification. In a survey of sexual behavior, heterosexual and homosexual respondents were asked to rate the importance of a variety of reasons for having sex and not having sex. The results showed that men and women differed in the importance attached to emotional and physical motives, with gender differences appearing in both heterosexuals and homosexuals. Certain practical motives (e.g., to reproduce, fear of AIDS, fear of pregnancy) differentiated between homosexuals and heterosexuals. Motivations predicting frequency of sexual behavior in the last month depended on the relationship status of the respondent. These findings, although suggesting that gender differences in motivations for sex persist in all kinds of relationships, point to many similarities among gay and straight men and women in reasons for having sex and limiting sexual activity.     

房屋砌体砂浆强度检测方法比较研究

一、概述 随着城市建设的不断发展,住宅建设规模的不断扩大,工程质量问题日益突出,房屋质量纠纷不断增加.作为天津市房屋的鉴定检测机构,如何提高房屋质量的检测准确性,公平、公正地提供检测数据,为构建和谐社会提供科学的依据显得日趋重要.     

儿童保护考验社会的法律信仰

立法是公共权力、社会秩序和社会正义的综合体．是对政权组织和个人按照社会正义原则进行权力及义务的安排和分配。立法的实质和有效性不在于强力，而在于其目的的合理性．即是否体现了社会正义原则。在涉及儿童权益问题上，不能将其监护人和利益相关者的需求作为首要的标准．将体现社会正义的救援干预放在从属于“自愿交易”的位置．儿童权益事实上成为各方利益博弈的筹码。特别是如果仍将对孤儿、流浪儿童等处于困境儿童的救助还限于慈善事业的范围，反映出的则是在有限的法律制度背后的法律信仰的缺失。由于儿童处于依附性社会角色，如果没有来自社会主动的、有组织的关注．司法体制在缺少监督压力的情况下，往往是低效率的。社会资本是促进人们合作行为的规范，对于社会资本的判断，也在一定意义上是垄断司法资源，还是让人们信仰法律的公开性、正义性的体制理念。     

Stationarity test of electromyographic signals during isokinetic trunk exertions

The aim of this study is to investigate the stationarity of the electromyographic (EMG) signals during isokinetic exertions of the trunk muscle. Six healthy subjects participated in this study. The erector spinae muscles were used to collect the signals. In order to simulate the isokinetic exercises of the trunk, a Cybex system with a trunk modular component was used. All subjects performed sustained exertions with a combination of load (25%, 50% MVC) and angular velocity (0, 15, 30 degree/s). The stationarity of the signals was tested by the reverse arrangements test and modified reverse arrangements test. In the results, the signal stationarity was high in all conditions in the reverse arrangements test. However, in the modified reverse arrangements test it was relatively low at about the 30 degree/s angular velocity. In the analysis of variance, the effect of angular velocity was statistically significant at the 0.05 significance level in the modified reverse arrangements test and Tukey's HSD grouping showed that the stationarity of 30 degree/s angular velocity was significantly different from 0, 15 degree/s condition. These results indicate that the stationarity of the EMG signals showed no difference between isometric and isokinetic conditions when the angular velocity was equal to 15 degree/s.     

An empirical test of competing hypotheses for the annuity puzzle

This paper conducts the first empirical test of numerous rational and behavioral hypotheses for the low annuity demand observed in private markets. We designed a questionnaire based on findings from economics and psychology, enabling us to simultaneously investigate a broad range of motives that presumably constitute the reluctance to buy annuities. To address the interdependence of financial product choice and domain-specific investor sophistication, we construct and employ a novel, comprehensive measure of “annuity literacy”. The results from a representative survey among German consumers reveal that both established rational and so far untested behavioral motives are significant barriers to annuitize wealth. Furthermore, the overall level of annuity literacy is rather low, with most respondents lacking knowledge of an annuity’s core mechanics. These findings disclose promising directions for annuity suppliers, policy makers, and researchers towards resolving the annuity puzzle.