Importance of Uncertainty and Variability to Predicted Risks from Trophic Transfer of PCBs in Dredged Sediments

Biomagnification of organochlorine and other persistent organic contaminants by higher trophic level organisms represents one of the most significant sources of uncertainty and variability in evaluating potential risks associated with disposal of dredged materials. While it is important to distinguish between population variability (e.g., true population heterogeneity in fish weight, and lipid content) and uncertainty (e.g., measurement error), they can be operationally difficult to define separately in probabilistic estimates of human health and ecological risk. We propose a disaggregation of uncertain and variable parameters based on: (1) availability of supporting data; (2) the specific management and regulatory context (in this case, of the U.S. Army Corps of Engineers/U.S. Environmental Protection Agency tiered approach to dredged material management); and (3) professional judgment and experience in conducting probabilistic risk assessments. We describe and quantitatively evaluate several sources of uncertainty and variability in estimating risk to human health from trophic transfer of polychlorinated biphenyls (PCBs) using a case study of sediments obtained from the New York-New Jersey Harbor and being evaluated for disposal at an open water off-shore disposal site within the northeast region. The estimates of PCB concentrations in fish and dietary doses of PCBs to humans ingesting fish are expressed as distributions of values, of which the arithmetic mean or mode represents a particular fractile. The distribution of risk values is obtained using a food chain biomagnification model developed by Gobas by specifying distributions for input parameters disaggregated to represent either uncertainty or variability. Only those sources of uncertainty that could be quantified were included in the analysis. Results for several different two-dimensional Latin Hypercube analyses are provided to evaluate the influence of the uncertain versus variable disaggregation of model parameters. The analysis suggests that variability in human exposure parameters is greater than the uncertainty bounds on any particular fractile, given the described assumptions.     

Antecedents of Union Commitment: The Impact of Union Membership Differences in Vertical Dyads and Work Group Relationships

Relational demography has recently been employedto investigate the influence of workplace diversity onorganizational outcomes, such as organizationalcommitment, turnover, and performance (O Reilly,Caldwell, & Barnett, 1989; Tsui & O Reilly, 1989;Tsui, Egan, & O Reilly, 1992; Tsui, Egan, &Porter, 1994). In the present study, we utilize thetechniques and theoretical framework employed in the relational demography literature to examine theimpact of heterogeneous union membership status withinwork groups and vertical dyads, and the effect of thesedifferences on union commitment. A composite dataset was created from two Australianhospitals. Analyses of the data were confined to 460nursing staff who could be identified within 43 specificwork groups (hospital wards). The results indicate that while no relationship was found betweendifferences in membership status among co-workers inwork groups on commitment, differences between membersand their supervisors served to decrease union loyalty and belief in unionism (controlling for otherunion and organizational factors). Importantly, we foundsupport for an interaction effect between work groupsand vertical dyads. Differences in membership status among co-workers were observed to lowerunion loyalty and willingness to work for the union whensupervisors were nonunion members. The implications ofsuch findings for union policy are addressed.     

Housing as Health Capital: How Health Trajectories and Housing Paths Are Linked

This article explores the relationships between housing and health inequalities. It locates housing within a network of health resources that can either promote well-being or increase susceptibility to disease. Housing thereby contributes to the accumulation, or depletion, of the health capital of individuals and communities. Qualitative interviews in three British regions help specify the links between health capital, on the one hand, and the network of resources, environments, events, institutions, and social relations comprising the housing system, on the other. The findings show why, from a health capital/health-resources-network perspective, a segment of the housing system (owner-occupation) that generally appears therapeutic can have the opposite effect for people whose resilience is low or whose health is in decline .     

Chemical Health Effects Assessment Methodology for Airborne Contaminants

Chemical Health Effects Assessment Methodology (CHEM) is a new procedure for assessing hazardous properties of airborne toxic contaminants. CHEM evaluates substances for four major health effect categories: carcinogenicity, mutagenicity, reproductive/developmental toxicity, and toxic effects other than the first three. Three elements are considered in the assessment: weight of evidence, potency, and severity of effect. This approach produces a profile of toxic properties of chemicals which preserves their unique multidimensional character and highlights data gaps.     

The training process of the Maryland Guardianship Assistance Project: a collaborative model for kinship foster care

Understanding models of multidisciplinary collaborations in child welfare has become essential for policy development, program success, and improving outcomes for children in foster care. The authors present the state of Maryland's Guardianship Assistance Project (GAP) as a model of multidisciplinary collaboration in child welfare and describe the training process that supported the development of the model. Key components for effective collaborative practice, lessons learned, and recommendations from the GAP collaboration are presented.     

Managing Employee Compliance with Information Security Policies: The Critical Role of Top Management and Organizational Culture*

We develop an individual behavioral model that integrates the role of top management and organizational culture into the theory of planned behavior in an attempt to better understand how top management can influence security compliance behavior of employees. Using survey data and structural equation modeling, we test hypotheses on the relationships among top management participation, organizational culture, and key determinants of employee compliance with information security policies. We find that top management participation in information security initiatives has significant direct and indirect influences on employees’ attitudes towards, subjective norm of, and perceived behavioral control over compliance with information security policies. We also find that the top management participation strongly influences organizational culture which in turn impacts employees’ attitudes towards and perceived behavioral control over compliance with information security policies. Furthermore, we find that the effects of top management participation and organizational culture on employee behavioral intentions are fully mediated by employee cognitive beliefs about compliance with information security policies. Our findings extend information security research literature by showing how top management can play a proactive role in shaping employee compliance behavior in addition to the deterrence oriented remedies advocated in the extant literature. Our findings also refine the theories about the role of organizational culture in shaping employee compliance behavior. Significant theoretical and practical implications of these findings are discussed.     

The Characteristics of Children with a Disability Looked After away from Home and their Future Service Needs

Correspondence to Professor Roy McConkey, School of Nursing, University of Ulster, Newtownabbey, N. Ireland BT37 0QB. E-mail: r.mcconkey{at}ulster.ac.uk Summary Little is known about the characteristics of children with disabilitieswho meet the British legal definition of ‘looked after’children. Data were obtained on 108 such children living withinone geographical area in Northern Ireland and who spent 90 daysor more in a 12-month period living away from the family home.However, this figure may under-estimate the numbers, given thedifficulties in tracking children aged over 14 years who wereadmitted to hospitals on a short- or long-term basis. The medianage of the children was 14 years; most had learning disabilitiesallied with challenging behaviours, communication difficulties,autism and some were technologically dependent. Many of theirfamilies experienced a range of problems. One-third of the childrenwere accommodated in various residential settings but half ofthese placements were in hospital or adult residential accommodation.However, there were marked differences in the services providedto this client group by the four provider agencies. Future serviceneeds included increased respite breaks for families and theprovision of both more residential placements and more appropriateaccommodation, especially for teenagers. The dilemmas in reconcilingthe need for local, but specialized, service provision are discussed.     

Bachelor of Social Work Students and Mental Health Stigma: Understanding Student Attitudes

Bachelor-level social work students (n = 198) at a midsized Midwestern public university were surveyed to evaluate their attitudes toward those with mental health concerns. Additionally, students were surveyed regarding their willingness to seek treatment for their own mental health needs. Results of the analyses suggest that the majority of students do not hold stigmatizing attitudes toward mental illness. Students who believed mental health work is rewarding were less likely to be afraid or uncomfortable around people with mental illness. In addition, these students were more likely to report attitudes that acknowledge the capabilities of people with mental illness and were less concerned with others knowing their own mental health status. Implications for social work education and directions for future research are discussed.