Assessing the Relationship Between Environmental Lead Concentrations and Adult Blood Lead Levels

This paper presents a model for predicting blood lead levels in adults who are exposed to elevated environmental levels of lead. The model assumes a baseline blood lead level based on average blood lead levels for adults described in two recent U.S. studies. The baseline blood lead level in adults arises primarily from exposure to lead in diet. Media-specific ingestion and absorption parameters are assessed for the adult population, and a biokinetic slope factor that relates uptake of lead into the body to blood lead levels is estimated. These parameters are applied to predict blood lead levels for adults exposed to a hypothetical site with elevated lead levels in soil, dust and air. Blood lead levels ranging from approximately 3-57 μg/dl are predicted, depending on the exposure scenarios and assumptions.     

Pensions and the uses of ignorance by unions and firms

Pensions are contingent claims contracts that are often fashioned by collective bargaining under conditions of asymmetric information and market power. Pensions are not an employer’s or a union’s optimal contract; they represent compromise. Employers use pensions to minimize labor costs and to adjust to market changes. Pensions help unions improve and protect their members’ work lives and help unions to survive as institutions. When workers’ estimations of their pensions differ from their employers’ estimations a moral hazard can exist. Less mobile workers and those with less influence subsidize the pension benefits of other workers or reduce an employer’s costs. Econometric results based on data from the President’s Commission on Pension Policy show that certain workers, namely women, overvalue their plans, which provides an opportunity to lower labor costs and redistribute benefits. Unions have a contradictory effect on information. The author thanks participants in the Cornell University Collective Bargaining workshop and the Harvard Labor Economics workshop. I especially thank James Medoff for his comments.     

Shake,Rattle, and … One or Two Objects? Young Infants' Use of Auditory Information to Individuate Objects

Most research on object individuation in infants has focused on the visual domain. Yet the problem of object individuation is not unique to the visual system, but shared by other sensory modalities. This research examined 4.5‐month‐old infants' capacity to use auditory information to individuate objects. Infants were presented with events in which they heard 2 distinct sounds, separated by a temporal gap, emanate from behind a wide screen; the screen was then lowered to reveal 1 or 2 objects. Longer looking to the 1‐ than 2‐object display was taken as evidence that the infants (a) interpreted the auditory event as involving 2 objects and (b) found the presence of only 1 object when the screen was lowered unexpected. The results indicated that the infants used sounds produced by rattles, but not sounds produced by an electronic keyboard, as the basis for object individuation (Experiments 1 and 2). Data collected with adult participants revealed that adults are also more sensitive to rattle sounds than electronic tones. A final experiment assessed conditions under which young infants attend to rattle sounds (Experiment 3). Collectively, the outcomes of these experiments suggest that infants and adults are more likely to use some sounds than others as the basis for individuating objects. We propose that these results reflect a processing bias to attend to sounds that reveal something about the physical properties of an object—sounds that are obviously linked to object structure—when determining object identity.     

Uniform stochastic orderings and total positivity

Uniform stochastic orderings of random variables are expressed as total positivity (TP) of density, survival, and distribution functions. The orderings are called uniform because each is a stochastic order that persists under conditioning to a family of intervals—for example, the family consisting of all intervals of the form (-∞,x]. This paper is concerned with the preservation of uniform stochastic ordering under convolution, mixing, and the formation of coherent systems. A general TP₂ result involving preservation of total positivity under integration is presented and applied to convolutions and mixtures of distribution and survival functions. Log-concavity of distribution, survival, and density functions characterizes distributions that preserve the various orderings under convolution. Likewise, distributions that preserve orderings under mixing are characterized by TP₂ distribution and survival functions.     

Assessment and management of hospitalized suicidal patients

Suicide in inpatient psychiatric settings is a critical problem. A comprehensive literature review was performed to determine risk factors for inpatient suicide, instruments for assessing suicide, and treatment of hospitalized suicidal patients. Findings suggested that root causes of inpatient suicide were factors related to the treatment environment, failure to assess patient behavioral characteristics, and staff reliance on no-suicide contracts. Recommendations include assessing suicide risk regularly throughout hospitalization, including on admission, during changes in a patient's mental or physical status, after a change in observation level, and before discharge. Orientation and inservice education for all staff and additional research on the psychometric properties of available suicide assessment instruments are also essential.     

Pre-Sentence Reports: Does Quality Matter?

In recent years much attention has been paid to research into the value and effectiveness of pre-sentence reports and this has contributed to the emergence of the concept of "quality assurance". This encompasses the practice of monitoring reports for "quality" and "effectiveness" and the assumption that there is a positive association between these two factors. In other words, higher quality will normally be associated with a higher level of agreement or concordance between report recommendation and sentencing outcome. Using evidence gained from a sample of pre-sentence reports from a busy magistrates' court in the south-west of England, the authors' three main findings show that this is not the case. First, contrary to expectation, there was little or no relationship between quality of report and concordance rate for the whole sample of pre-sentence reports. Second, whilst there was some relationship between quality of report and concordance for those reports which proposed community sentences, this was not significant. Finally, whilst report writers were generally in favour of quality assurance systems, they did not have any universal definition of "quality" in relation to pre-sentence reports. As a result of these findings the authors question existing practice and make several suggestions for improvement, including the replacement of pre-sentence reports with a new personal social enquiry report and an alternative model of quality assurance based on models from social science. Finally, several key recommendations are identified as essential in order to safeguard the crucial role of the Probation Service as adviser to sentencers.     

A qualitative data analysis: family victim advocates in child advocacy centers

ABSTRACT

Family victim advocates in child advocacy centers provide a valuable resource to children and parents involved in child abuse investigations. This work requires that family victim advocates be knowledgeable in such areas as child development, crisis intervention, community resources, family relationships, child welfare and criminal justice systems. Because family victim advocates provide essential services to parents and caregivers, the role requires ongoing training and education to remain current on the ever-changing complexities of working with not only the children and families but also the criminal and child protection systems responsible for investigating these cases. The current study reports the findings from a nationwide survey of family victim advocates employed in child advocacy centers related to their motivation for doing the work as well as their perceptions of their training and potential training needs. A group of doctoral students comprised the research team and worked collaboratively under the supervision of university faculty to conduct the qualitative data analysis. The findings describe the characteristics and motivations of family victim advocates working in child advocacy centers and emphasize the need for more advanced trainings that focus on skill-building and strengths-based practices utilized to support children and parents in child abuse cases.