Defining causal mediation with a longitudinal mediator and a survival outcome

In the context of causal mediation analysis, prevailing notions of direct and indirect effects are based on nested counterfactuals. These can be problematic regarding interpretation and identifiability especially when the mediator is a time-dependent process and the outcome is survival or, more generally, a time-to-event outcome. We propose and discuss an alternative definition of mediated effects that does not suffer from these problems, and is more transparent than the current alternatives. Our proposal is based on the extended graphical approach of Robins and Richardson (in: Shrout (ed) Causality and psychopathology: finding the determinants of disorders and their cures, Oxford University Press, Oxford, 2011), where treatment is decomposed into different components, or aspects, along different causal paths corresponding to real world mechanisms. This is an interesting alternative motivation for any causal mediation setting, but especially for survival outcomes. We give assumptions allowing identifiability of such alternative mediated effects leading to the familiar mediation g-formula (Robins in Math Model 7:1393, 1986); this implies that a number of available methods of estimation can be applied.

     

Busy Signal: Effects of Mobile Device Usage on Pedestrian Encounters

Mobile communication technology plays an increasingly pervasive role in everyday life. This study examined one aspect of this role, specifically, the effects of mobile device use on the micro-interactions of pedestrians as they approached and passed a confederate. Over 400 participants were observed in a 2 (group: mobile device vs. control) × 3 [condition: look-only (L); look and smile (LS); look, smile, and greeting (LSG)] factorial design study measuring participants’ looks, smiles, nods, and greetings toward the confederates. Log-linear analyses of the dependent measures provided qualified support for the predicted decreased responsiveness from mobile device users. Specifically, a group by condition interaction on smiles showed that significantly fewer mobile device users than controls smiled at the confederates in the LSG condition. In addition, a group by sex of participant interaction on greetings indicated that significantly fewer female mobile device users offered greetings than males and females in the other conditions. The processes potentially mediating these effects are discussed and the broader influence of mobile devices on the micro-interactions of pedestrians is considered.     

Pricing policies and corporate strategy

In this article, attention is drawn to the importance of pricing in the formulation of corporate strategies. The author compares traditional “cost plus” pricing with market oriented approaches, and argues the case for pricing policies to be given greater emphasis in corporate planning. He examines the role of the corporate planner in developing price strategies for existing products and for new products and recommends the formulation of product strategies based on greater price leverage.     

A Simplified Method of Calculating an Overall Goodness-of-Fit Test for the Cox Proportional Hazards Model

Gronnesby and Borgan (1996) propose an overall goodness-of-fit test for the Cox proportional hazards model. The basis of their test is a grouping of subjects by their estimated risk score. We show that the Gronnesby and Borgan test is algebraically identical to one obtained from adding group indicator variables to the model and testing the hypothesis the coefficients of the group indicator variables are zero via the score test. Thus showing that the test can be calculated using existing software. We demonstrate that the table of observed and estimated expected number of events within each group of the risk score is a useful adjunct to the test to help identify potential problems in fit.     

The link between parenting approaches and health behavior: A systematic review

The familial home environment, where parenting takes place, plays an important role in the health behaviors that children and adolescents engage in and has implications on health and well-being in later life. Lifestyle-related behaviors predispose children and adolescents to the global burden of non-communicable and other lifestyle-related diseases. This review therefore examined and described previous studies looking at the associations between health behaviors and parenting approaches. It suggests that engagement in health behaviors, which promotes overall health and well-being, was associated with autonomy, supportive parenting, parental encouragement, behavior control, parental nurturance, warmth and responsiveness, and parental involvement. The review highlights the gap in literature focusing on the health behavior of children and adolescents as well as on parenting. In addition, the review also provides an overview of the continents where fewer studies have examined the presented associations. The findings presented also serve as a guide for program development and implementation to address the increase in non-communicable and other lifestyle-related diseases.     

Examining the Effect of Correctional Programming on Perceptions of Likelihood of Recidivism Among Incarcerated Prisoners

ABSTRACT

For many years, policymakers and criminal justice scholars have debated the impact of correctional programming on recidivism. This debate is currently unresolved. Using data from 1,234 currently incarcerated inmates in a mid-Southern state, this study examines whether inmates who participate in correctional programming while incarcerated are less likely to feel that they will recidivate upon release from prison. The findings from this research suggest that program participation while in prison has little impact on the inmates’ perceived recidivism, although important programming effects may still occur. Policy implications and directions for future research are discussed.     

When the Methodological Shoe is on the Other Foot: African American Interviewer and White Interviewees

Some scholars engaging in the insider/outsider debate have argued that the pairing of researcher and subjects based on racial similarity—i.e., “race matching”—is the most effective means for conducting qualitative research. Although insider/outsider status has been discussed with respect to white researchers' studies of African Americans, I explore the heretofore rarely discussed situation in which an African American is the researcher and whites are the subjects. I argue that insider status with respect to race continues to be based on a presumed connectedness linked to phenotypical characteristics—like skin color or hair texture. Yet, rather than experiencing a solely insider or outsider status, researchers and subjects experience what I call “insider moments” wherein their interests converge and they are able to share in the kinds of interactions that yield important insights. I conclude by evaluating the utility of insider/outsider status in qualitative research.     

Culture-based versus risk-based screening for the prevention of group B streptococcal disease in newborns: A review of national guidelines

BackgroundMaternal colonisation with group B streptococcus (GBS) is recognised as the most frequent cause of severe early onset infection in newborns. National and international guidelines outline two approaches to the prevention of early onset disease in the neonate: risk based management and antenatal culture-based screening. We undertook an analysis of existing national and international guidelines in relation to GBS in pregnancy using a standardised and validated instrument to highlight the different recommended approaches to care.MethodsEnglish language guidelines on the screening and management of GBS colonisation in pregnant women and the prevention of early-onset group B streptococcal disease in newborns were sought.ResultsFour guidelines met the inclusion criteria, one from the United States of America (USA), the United Kingdom (UK), Canada and New Zealand. All four were appraised as at a high standard in terms of development using the AGREE II tool. Both approaches were recommended in the guidelines with different regions of the world advocating different approaches often based on the same evidence. Guidelines from the USA recommend an antenatal culture-based approach while the UK guidelines recommend risk-based management.ConclusionBased on an AGREE II analysis, the standard of the guidelines was high despite having disparate recommendations. Both approaches to the prevention of early onset GBS infection in neonates are recommended with the split being geographically-based.     

Nightlife Girls: Envy,Theatre, and Encounters with Men and Women

This article explores how envy influences affective performance in the service industry. Utilizing the first‐person accounts of 12 women working in one Manhattan bar, it examines how the experiences these women have with male and female customers are differently intersected by expectations for gendered performance. It further explores how envy — as the emotion most prompted in the servers in the face of these expectations — can in response be harnessed as a force for their critical agency. Seeing envy as both an antagonizer and central defence mechanism, the paper goes on to dissect the various strategies employed by the serving women to both adopt the differing embodiments of affective gender performance expected by their male and female customers, and protect themselves from the emotional damage that is risked in adopting such externally dictated subjectivities.