Alumni of a BSW-Level Specialized Title IV-E Program Voice Their Experiences in the Workplace

This study surveyed 289 alumni of a specialized Title IV-E program that prepares undergraduate social work students for careers in public child welfare, examining factors such as turnover rates, adherence to strengths-based practice principles, perceptions of work conditions, and intent to stay. Findings indicate that graduates of this program were less likely than other caseworkers to leave their positions. Most maintained adherence to strengths-based practice principles, reported satisfaction with the work, felt supported by colleagues, and intended to stay in the field of child welfare. Based on alumni comments, ways that agencies can retain such workers are suggested.     

Progression-free survival in oncological clinical studies: Assessment time bias and methods for its correction

Progression-free survival (PFS) is a frequently used endpoint in oncological clinical studies. In case of PFS, potential events are progression and death. Progressions are usually observed delayed as they can be diagnosed not before the next study visit. For this reason potential bias of treatment effect estimates for progression-free survival is a concern. In randomized trials and for relative treatment effects measures like hazard ratios, bias-correcting methods are not necessarily required or have been proposed before. However, less is known on cross-trial comparisons of absolute outcome measures like median survival times. This paper proposes a new method for correcting the assessment time bias of progression-free survival estimates to allow a fair cross-trial comparison of median PFS. Using median PFS for example, the presented method approximates the unknown posterior distribution by a Bayesian approach based on simulations. It is shown that the proposed method leads to a substantial reduction of bias as compared to estimates derived from maximum likelihood or Kaplan–Meier estimates. Bias could be reduced by more than 90% over a broad range of considered situations differing in assessment times and underlying distributions. By coverage probabilities of at least 94% based on the credibility interval of the posterior distribution the resulting parameters hold common confidence levels. In summary, the proposed approach is shown to be useful for a cross-trial comparison of median PFS.     

Participation as a means of enhancing the legitimacy of decisions on technology? A sceptical analysis

The legitimacy of technology as a whole, of individual fields of technology, and of concrete decisions on technology has become problematic. Traditional methods and elements for the legitimization of technological development and of the application of technology have been increasingly called into question since the 1980s. There are great expectations in participatory procedures to improving the legitimization of technology decisions. Those expectations, however, might not be justified. In the paper, the hypothesis is proposed that legitimacy can be brought about through participation only under conditions that require the fulfillment of a number of preconditions, which often cannot be regarded as fulfilled. The unavoidable separation between internal communication among the participants and external communication with the nonparticipants turns out to be the fundamental structural characteristic hindering naïve expectations of improving legitimacy by participation.

---

Zusammenfassung Die Legitimität von Technik als Ganzem, von einzelnen Technikfeldern und von konkreten Technikentscheidungen ist heute problematisch. Traditionelle Methoden und Elemente für die Legitimierung technischer Entwicklungen und der Anwendung von Technik werden seit den Achtzigerjahren immer mehr in Frage gestellt. Nun setzt man große Erwartungen in partizipatorische Prozeduren, die die Legitimierung von Technikentscheidungen verbessern sollen, Erwartungen, die jedoch möglicherweise nicht gerechtfertigt sind. In diesem Beitrag stellen wir die Hypothese zur Diskussion, dass Partizipation nur unter Umständen zu Legitimität führen kann, die voraussetzen, dass bestimmte Vorbedingungen erfüllt sind, was jedoch oft nicht der Fall ist. Die unvermeidliche Trennung zwischen interner Kommunikation unter den Teilnehmern und externer Kommunikation mit den Nichtteilnehmern erweist sich als das grundlegende strukturelle Merkmal, das der Erfüllung naiver Erwartungen hinsichtlich einer erhöhten Legitimität durch Partizipation im Weg steht.

---

Résumé La légitimité de la technologie en tant que tout, de domaines technologiques particuliers et de décisions technologiques concrètes est aujourdhui problématique. Les méthodes et les éléments traditionnels de légitimation des développements technologiques sont depuis les années quatre-vingts de plus en plus remis en question. On fonde à présent de grands espoirs dans les procédures participatives, qui doivent améliorer la légitimation des décisions technologiques, un espoir qui nest cependant peut-être pas justifié. Dans cet article, nous discutons lhypothèse selon laquelle la participation ne peut mener à la légitimité que dans des conditions impliquant à leur tour que certains préalables soient remplis, ce qui nest souvent pas le cas. La séparation inévitable entre la communication interne entre participants et la communication externe avec les nonparticipants savère une caractéristique structurelle fondamentale faisant obstacle à laccomplissement dattentes naïves pour ce qui est dune légitimité accrue par la participation.

     

Oxidative stress increases continuously with BMI and age with unfavourable profiles in males

Oxidative stress is a risk factor for chronic diseases and was previously shown to be independently associated with obesity. The authors investigated the relationship between body mass index (BMI), age and oxidative stress on 2190 subjects undergoing a health care examination. Total antioxidant status (TAS), total peroxides (TOC) and autoantibodies against oxidized LDL (oLAb) were used as oxidative stress biomarkers in addition to serum lipoproteins, bilirubin and uric acid. Gender-specific differences were observed for age, BMI, serum concentrations of bilirubin, low-density lipoprotein (LDL), uric acid and TAS, all of which were higher in males (p < 0.001), while high-density lipoprotein (HDL), HDL/LDL ratio and TOC were higher in females (p < 0.001). Total cholesterol (p < 0.05) and LDL were increased (p < 0.05), while HDL was decreased (p < 0.05) in overweight and obese subjects. This was accompanied by increased uric acid and TAS concentrations. Lowest oLAb titers were detected in obese subjects. In extremely obese subjects, increased TOC and decreased TAS were observed in spite of high uric acid levels. These results demonstrate that oxidative stress increases with increasing BMI and age, as a sequel to an impaired antioxidant status, the consumption of oLAbs, an increase of peroxides and uric acid and a disadvantaged lipid profile.     

Efficient estimators with categorical ranked set samples: estimation procedures for osteoporosis

Ranked set sampling (RSS) design as a cost-effective sampling is a powerful tool in situations where measuring the variable of interest is costly and time-consuming; however, ranking information about sampling units can be obtained easily through inexpensive and easy to measure characteristics at little or no cost. In this paper, we study RSS data for analysis of an ordinal population. First, we compare the problem of non-representative extreme samples under RSS and commonly-used simple random sampling. Using RSS data with tie information, we propose non-parametric and maximum likelihood estimators for population parameters. Through extensive numerical studies, we investigate the effect of various factors including ranking ability, tie generating mechanisms, the number of categories and population setting on the performance of the estimators. Finally, we apply the proposed methods to the bone disorder data to estimate the proportions of patients with osteopenia and osteoporosis status.     

Sample size planning for phase II trials based on success probabilities for phase III

In recent years, high failure rates in phase III trials were observed. One of the main reasons is overoptimistic assumptions for the planning of phase III resulting from limited phase II information and/or unawareness of realistic success probabilities. We present an approach for planning a phase II trial in a time‐to‐event setting that considers the whole phase II/III clinical development programme. We derive stopping boundaries after phase II that minimise the number of events under side conditions for the conditional probabilities of correct go/no‐go decision after phase II as well as the conditional success probabilities for phase III. In addition, we give general recommendations for the choice of phase II sample size. Our simulations show that unconditional probabilities of go/no‐go decision as well as the unconditional success probabilities for phase III are influenced by the number of events observed in phase II. However, choosing more than 150 events in phase II seems not necessary as the impact on these probabilities then becomes quite small. We recommend considering aspects like the number of compounds in phase II and the resources available when determining the sample size. The lower the number of compounds and the lower the resources are for phase III, the higher the investment for phase II should be. Copyright © 2015 John Wiley & Sons, Ltd.