Bayesian methods for the cross-design synthesis of epidemiological and toxicological evidence

Summary.  Systematic review and synthesis (meta-analysis) methods are now increasingly used in many areas of health care research. We investigate the potential usefulness of these methods for combining human and animal data in human health risk assessment of exposure to environmental chemicals. Currently, risk assessments are often based on narrative review and expert judgment, but systematic review and formal synthesis methods offer a more transparent and rigorous approach. The method is illustrated by using the example of trihalomethane exposure and its possible association with low birth weight. A systematic literature review identified 13 relevant studies (five epidemiological and eight toxicological). Study-specific dose–response slope estimates were obtained for each of the studies and synthesized by using Bayesian meta-analysis models. Sensitivity analyses of the results obtained to the assumptions made suggest that some assumptions are critical. It is concluded that systematic review methods should be used in the synthesis of evidence for environmental standard setting, that meta-analysis will often be a valuable approach in these contexts and that sensitivity analyses are an important component of the approach whether or not formal synthesis methods (such as systematic review and meta-analysis) are used.     

Students’ Vocational Choices and Voluntary Action: A 12-Nation Study

Previous research on student involvement suggested that business and engineering students manifest lowest rates of voluntary action. Similarly, it was thought that social science students are the most involved in voluntary action, with students of natural sciences and humanities in the middle. However, there were very few studies that empirically compared these assertions. Furthermore, these assertions were not investigated from cross-cultural perspectives. Based on a study of students in 12 countries (N = 6,570), we found that even when controlling for background variables, social science students are actually less engaged in voluntary action than other students. Engineering students are higher than expected on voluntary action while students of humanities are the most involved in voluntary action. When studying these differences in the 12 selected countries, local cultures and norms form different sets of findings that suggest that there is no universal trend in choice of academic field and voluntary action.     

Maltreated Children: A Systems Approach to Treatment Planning in Clinical Settings

Children exposed to significant abuse, neglect and household dysfunction often present a confusing and difficult‐to‐treat clinical picture. This paper discusses the use of systems theory to develop treatment plans for maltreated children in clinical settings. Although its value is well recognised in the literature, systems thinking is not easy to implement in ordinary clinical settings and the systemic approach is not universally practised. Systems theory is an integrative theory, which helps clinicians identify and prioritise key areas of difficulty, and organise information from multiple system levels into a well‐defined treatment plan. Treatment plans take into account not only patient but also service factors, and to be viable in clinical settings must function within the limits of organisational reality. A case vignette is provided.     

Collective and Reflexive Styles of Volunteering: A Sociological Modernization Perspective

This paper presents a theory-guided examination of the (changing) nature of volunteering through the lens of sociological modernization theories. Existing accounts of qualitative changes in motivational bases and patterns of volunteering are interpreted against the background of broader, modernization-driven social-structural transformations. It is argued that volunteer involvement should be qualified as a biographically embedded reality, and a new analytical framework of collective and reflexive styles of volunteering is constructed along the lines of the ideal-typical biographical models that are delineated by modernization theorists. Styles of volunteering are understood as essentially multidimensional, multiform, and multilevel in nature. Both structural-behavioral and motivational-attitudinal volunteering features are explored along the lines of six different dimensions: the biographical frame of reference, the motivational structure, the course and intensity of commitment, the organizational environment, the choice of (field of) activity, and the relation to paid work.     

INTEGRATING ECONOMIC DUALISM AND LABOR MARKET SEGMENTATION:

Although the U.S. economy of the early twenty-first century is vastly different from the U.S. economy prior to the 1970s, the nature of these economic changes and their impact on U.S. workers is unclear. This article claims that despite contemporary economic shifts, differential labor and employer power continues to segment the economy, and workers' position in the labor market continues to predict their rewards, beyond the effects of gender, race, and human capital. Drawing on segmented labor market and dual economy research, we propose a four-category model of the structural factors that influence variance in work-related rewards. We examine the distribution of jobs in each of four categories between 1974 and 2000 and observe that losses and gains across categories are unevenly distributed by race and gender. While white men have experienced the greatest declines in employment and earnings, they have maintained their absolute advantage over women and nonwhites. In multivariate analyses, we find that the structural position of employment continues to be a significant determinant of wages. Although women and racial minorities have experienced sizable increases in employment in primary labor market jobs in the core of the economy, both groups remain overrepresented in low-paying jobs. Moreover women, but not nonwhite men, consistently receive significantly fewer rewards for their labor in both low-paying and high-paying jobs. Our findings suggest that structural factors continue to influence earnings inequality, especially across race and gender lines.     

WESTERN SYDNEY AND THE DESIRE FOR HOME

‘Western Sydney’ frequently figures in current debates about urban planning as exemplifying ‘the problem of urban sprawl’. In this context it is represented as the spatial articulation of the irrational desires of a wilful population to live out ‘the great Australian dream’. This paper proposes an alternative reading of the western Sydney suburban landscape to argue for a different understanding of the issues it poses for urban planners. In particular, it is argued that this landscape articulates, and should be valued as, the memories and history of people struggling to make a home for themselves in the, modern world. Attempts by urban planners, it is suggested, to ignore or marginalise this version of ‘the great Australian dream’ will inevitably lead to failure.     

An Evaluation of the Emergence of Untrained Academic and Applied Skills After Instruction With Video Vignettes

The Analysis of Verbal Behavior - Applied behavior-analytic skills are derived from precise, technical, objective operational definitions and exemplars of natural phenomena. In some cases,...     

Developmental dilemmas of young children of immigrant parents

Migrant parents who are unable to complete the separation process from their country of origin may do so through their relationships with their young children. Two patterns of distorted early childhood development were identified: failure to integrate cognition with feeling, and serving as a cultural bridge at the expense of reality testing and individuation.Ms. Koplow is Associate Director of the Therapeutic Nursery of the Karen Horney Clinic and teaches at Bank Street College.is Director of the Child and Adolescent Partial Hospitalization Program at Metropolitan Hospital Center.     

Predictors of short-term reunification in South Australian substitute care

This study examines the factors that contribute to short-term reunification for 235 children placed in South Australian substitute care from 1998 to 1999. Proportional hazard analyses showed that non-Aboriginal children and those placed because of parental incapacity were significantly more likely to go home, whereas neglected and Aboriginal children were significantly less likely to go home. A detailed profile analysis highlighted the specific case characteristics or changes thought to have contributed to reunification in each case.