Reliability of accelerometric measurement of physical activity in older adults-the benefit of using the trimmed sum

There is general consensus that physical activity is important for preserving functional capacities of older adults and positively influencing quality of life. While accelerometry is widely accepted and applied to assess physical activity in studies, several problems with this method remain (e.g., low retest reliability, measurement errors). The aim of this study was to test the intra-instrumental retest reliability of a wrist-worn accelerometer in a 3-day measurement of physical activity in older adults and to compare different estimators. A sample of 123 older adults (76.5?±?5.1?years, 59?% female) wore a uniaxial accelerometer continuously for 1?week. The data were split into two repeated measurement values (week set) of 3?days each. The sum, the 80?C99th quantiles and the 80?C99th trimmed sums were built for each week set. Retest reliability was assessed for each estimator and graphically demonstrated by Bland?CAltman plots. The intraclass correlation of the retest reliability ranged from 0.22 to 0.91. Retest reliability increases when a more robust estimator than the overall sum is used. Therefore, the trimmed sum can be recommended as a conservative estimate of the physical activity level of older adults.     

Bisphenol A: How the Most Relevant Exposure Sources Contribute to Total Consumer Exposure

Bisphenol A (BPA) is an endocrine disrupting chemical that is found in human urine throughout industrial societies around the globe. Consumer exposure pathways to BPA include packaged food, household dust, air, and dental fillings. To date, information on the relative contribution of the different pathways to total consumer exposure is lacking, but is key for managing substance‐associated risks. We investigated the relative contributions of the pathways known to be most relevant for nine different consumer groups. Our results suggest that the most important pathways for infants and children are the use of polycarbonate (PC) baby bottles and for adults and teenagers the consumption of canned food. Dental surgery can also considerably contribute over a short time directly after the surgery. For infants fed with PC baby bottles with mean dose rates of 0.8 μg/kg_bw/d the highest exposure dose rate was calculated. This dose rate is far below the tolerable daily intake of 50 μg/kg_bw/d. However, it is of the same order of magnitude as recently reported concentrations that caused low‐dose health effects in rodents. We find a pattern of falling exposure levels with rising age that is supported by urinary concentrations of BPA available for selected consumer groups. Similarly, the exposure levels we predict are confirmed by the levels reported in these studies.     

Management consultancy’s role in delivering lasting [triple bottom line] benefits

Abstract

Management consultants have become ubiquitous in helping improve organizational performance. This paper presents an investigation of the impact of their interventions on organizational sustainability and growth through the performance improvement work carried out for and with their clients. The paper presents the findings of a questionnaire survey of 440 respondents from 206 countries; 197 of respondents were Small and Medium Sized Enterprises (SMEs) and 243 from large organizations. There is a particular focus on knowledge transfer in terms of urgency and impact of the work with regard to the extent to which consulting interventions in SMEs, as well as large multinational corporations, embed long-term sustainability practices.     

TWO-STAGE PROCEDURES FOR TESTING HOMOGENEITY OF MEANS AGAINST ORDERED ALTERNATIVES IN ONE-WAY ANOVA WITH COMMON UNKNOWN VARIANCE

In this paper we present two-stage procedures for testing the equality of normal means against ordered alternatives in one-way ANOVA with common and unknown variance. The procedures proposed are analogous to Williams's and Bartholomew's single-stage methods. A table of percentiles needed for implementation is provided. Some Monte Carlo results for estimating the power of both procedures are given.     

Human relations in industry

In developed societies, good human relations become of crucial importance as people demand treatment as individuals. However, many in management positions pay only lip service to the implications of this need. The main reasons for this are that good human relations are very expensive in terms of both money and management effort and require fundamental revision of many inherited attitudes. They require appropriate organizational provision, good working conditions and amenities together with broad-ranging welfare facilities. Perhaps more important than these, however, are the intangible factors of caring and involvement by management and workers. Such principles have reached a high and successful stage of development in the author's company. Examples from several companies highlight the value of such hygiene conditions in diminishing disputes and facilitating essential change.Leadership is crucial both in management and trades unions but effective leadership is only possible against a background of good human relations.     

A Probabilistic Framework for Risk Analysis of Widespread Flood Events: A Proof‐of‐Concept Study

This article presents a flood risk analysis model that considers the spatially heterogeneous nature of flood events. The basic concept of this approach is to generate a large sample of flood events that can be regarded as temporal extrapolation of flood events. These are combined with cumulative flood impact indicators, such as building damages, to finally derive time series of damages for risk estimation. Therefore, a multivariate modeling procedure that is able to take into account the spatial characteristics of flooding, the regionalization method top‐kriging, and three different impact indicators are combined in a model chain. Eventually, the expected annual flood impact (e.g., expected annual damages) and the flood impact associated with a low probability of occurrence are determined for a study area. The risk model has the potential to augment the understanding of flood risk in a region and thereby contribute to enhanced risk management of, for example, risk analysts and policymakers or insurance companies. The modeling framework was successfully applied in a proof‐of‐concept exercise in Vorarlberg (Austria). The results of the case study show that risk analysis has to be based on spatially heterogeneous flood events in order to estimate flood risk adequately.     

农民工的社会网络结构分析

采用2005年深圳外来农村流动人口的调查数据,利用指数随机图模型(p * 模型),分析了农民工的社会网络(包括社会支持网和社会讨论网)结构.分析结果显示,农民工社会网络关系稀疏.尤其是社会讨论网;无论在聚敛性还是扩张性方面,农民工社会网络的核心一边缘的局部结构均较明显,且有小团体现象产生;社会支持和社会讨论关系都更可能受到中间人的控制或约束.属性变量对社会支持网的影响较多.而对社会讨论网的影响较少.指数随机图模型为基于社会网络来认识农民工的社会化过程提供了新的方法.     

Sektion Soziologie und Ökologie

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