Relations between environmental problems,psychology and health among shift-workers in the Norwegian process industry

Abstract

A group of 89 male shift-workers, mean age 38 years, was examined for health complaints, subjective experience of their work environment, psychological defence strategies, and immunological factors. They worked in a process industry, controlling a complex chemical process partly by instruments and partly by direct checking of mechanical devices such as valves. Shifts were eight hours long and changed every second week.

The main problem areas identified were problems with the management, colleagues and superiors, feelings of being under-valued, time pressure, fear of making mistakes, and lack of influence and communication. The main health complaints were sleep disturbance and gastro-intestinal problems. Shift workers also complained about allergies, breathing difficulties, tension, anxiety and depression. There were no pathological levels of plasma immunoglobulins (Ig) or Ig complements. However, levels did correlate with experience of work-related problems and with measures of defence mechanisms. Up to 25% of the variance in die immunological indicators was explained by a combination of defence mechanism scores and those of perceived health and work problems. This suggests that immunoglobulins may be an indicator of work-related health risks (‘stress’), even if the level of explained variance is too low to use immunoglobulins alone as a ‘marker’. The same variables, and immunoglobulins, also related significantly to perceived health. This may be a particularly important indicator, and when combined with immunology and psychological variables, also as a risk factor for organic disease.     

Statistical comparisons of methods for interpolating the output of a numerical air quality model

This paper compares Models-3/Community Multiscale Air Quality (CMAQ) outputs at multiple resolutions by interpolating from coarse resolution to fine resolution and analyzing the interpolation difference. Spatial variograms provide a convenient way to investigate the spatial character of interpolation differences and, importantly, to distinguish between naive (nearest neighbor) interpolation and bilinear interpolation, which takes a weighted average of four neighboring cells. For example, when the higher resolution is three times the lower, the variogram of the difference between naive interpolation of the lower resolution output and the higher resolution output shows a depression at every third lag. This phenomenon is related to the blocky nature of naive interpolation and demonstrates the inferiority of naive interpolation to bilinear interpolation in a way that pixelwise comparisons cannot. Theoretical investigations show when one can expect to observe this periodic depression in the variogram of interpolation differences. Naive interpolation is in fact used widely in a number of settings; our results suggest that it should be routinely replaced by bilinear interpolation.     

The effect of long-term outcome studies on the therapy of schizophrenia: a critique

The reader of this commentary on Haley's paper by Stein will note that Stein refers to Haley as "the author of the critiqued paper" or "ACP," rather than by name. This unusual style was occasioned by the Editor's decision that Stein should comment on the paper without any knowledge of its authorship, in order that the focus of Stein's comments be on the substance of that paper and that his comments not be influenced by who had written it. The admittedly somewhat awkward references to "ACP" have been retained in Stein's comments in order to make that point clear.-Ed.     

Durable solutions for developing country refugees

"Refugee problems demand durable solutions" is the opening statement of the Principles for Action in Developing Countries adopted by the 1984 Executive Committee of the UN High Commissioner for Refugees (UNHCR). In fact, in most refugee situations no such demand is made. Those same Principles weakened the demand for durable solutions by labelling 3rd country resettlement as the least desirable and most costly solution and by indicating that when voluntary repatriation is not immediately feasible, it is sufficient to provide only temporary settlement for the refugees. This article seeks to provide some background to recent changes in refugee problems that have impeded the attainment of durable solutions and to explore some of the difficulties and possibilities for durable solutions in developing countries in the 1980s (author's).     

Refugee research bibliography

This is an unannotated, interdisciplinary bibliography on refugees, presented in alphabetical order by author and covering the period from the 1950s to the present.     

Three-year follow-up of Drug Abuse Resistance Education (D.A.R.E.)

The long-term effectiveness of D.A.R.E. was assessed by contrasting 9th-grade students who received the program in the 6th grade with others who did not receive the program. Of 38 elementary schools eligible for D.A.R.E. programs, 21 received the program and 17 did not. A follow-up survey assessed central D.A.R.E. concepts such as self-esteem, resistance to peer pressure, delay of experimentation with drugs, and drug use. Employing latent variables to represent the concepts, no significant differences were found between D.A.R.E. participants and controls. The authors discuss attenuation of effects and the generally antidrug context of schools.     

Improved Bounds on Relaxations of a Parallel Machine Scheduling Problem

We consider the problem of scheduling n jobs withrelease dates on m identical parallel machines to minimize the average completion time of the jobs. We prove that the ratio of the average completion time of the optimal nonpreemptive schedule to that of the optimal preemptive schedule is at most 7/3, improving a bound of Shmoys and Wein.     

Who Evacuates When Hurricanes Approach? The Role of Risk,Information, and Location*

Objective. This article offers an expanded perspective on evacuation decision making during severe weather. In particular, this work focuses on uncovering determinants of individual evacuation decisions. Methods. We draw on a survey conducted in 2005 of residents in the eight‐county Houston metropolitan area after Hurricane Rita made landfall on September 24, 2005. Results. We find that evacuation decisions are influenced by a heterogeneous set of parameters, including perceived risk from wind, influence of media and neighbors, and awareness of evacuation zone, that are often at variance with one of the primary measures of risk used by public officials to order or recommend an evacuation (i.e., storm surge). We further find that perceived risk and its influence on evacuation behavior is a local phenomenon more readily communicated by and among individuals who share the same geography, as is the case with residents living inside and outside official risk areas. Conclusions. Who evacuates and why is partially dependent on where one lives because perceptions of risk are not uniformly shared across the area threatened by an approaching hurricane and the same sources and content of information do not have the same effect on evacuation behavior. Hence, efforts to persuade residential populations about risk and when, where, and how to evacuate or shelter in place should originate in the neighborhood rather than emanating from blanket statements from the media or public officials. Our findings also raise important policy questions (included in the discussion section) that require further study and consideration by those responsible with organizing and implementing evacuation plans.