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The effect of Sachsenhausen visitors' personality and emotions on meaning and word of mouth

This study assessed the effect of visitors' personality and emotional response on finding positive meaning in life and the intention to spread positive word of mouth. The sample (n = 260) consists of visitors to Sachsenhausen Memorial and Museum near Berlin. Findings indicate that the emotion of interest positively contributes to finding positive meaning in life and positive word of mouth. The effects of personality are marginal. Personality explains little of the variance in positive meaning and positive word of mouth. Emotional response accounts for 25% of the variance in finding positive meaning in life-in terms of finding personal benefit from the visit, controlled for personality. Despite the dominant negative emotional response, tourists find positive meaning in their visit. These findings correspond with those observed in studies on personal trauma and loss. Positive meaning could potentially contribute to adjustment processes to cope with what occurred. Future research should include address longer term effects on postvisit behavior.

Noncollapsibility and its role in quantifying confounding bias in logistic regression

BackgroundConfounding bias is a common concern in epidemiological research. Its presence is often determined by comparing exposure effects between univariable- and multivariable regression models, using an arbitrary threshold of a 10% difference to indicate confounding bias. However, many clinical researchers are not aware that the use of this change-in-estimate criterion may lead to wrong conclusions when applied to logistic regression coefficients. This is due to a statistical phenomenon called noncollapsibility, which manifests itself in logistic regression models. This paper aims to clarify the role of noncollapsibility in logistic regression and to provide guidance in determining the presence of confounding bias.MethodsA Monte Carlo simulation study was designed to uncover patterns of confounding bias and noncollapsibility effects in logistic regression. An empirical data example was used to illustrate the inability of the change-in-estimate criterion to distinguish confounding bias from noncollapsibility effects.ResultsThe simulation study showed that, depending on the sign and magnitude of the confounding bias and the noncollapsibility effect, the difference between the effect estimates from univariable- and multivariable regression models may underestimate or overestimate the magnitude of the confounding bias. Because of the noncollapsibility effect, multivariable regression analysis and inverse probability weighting provided different but valid estimates of the confounder-adjusted exposure effect. In our data example, confounding bias was underestimated by the change in estimate due to the presence of a noncollapsibility effect.ConclusionIn logistic regression, the difference between the univariable- and multivariable effect estimate might not only reflect confounding bias but also a noncollapsibility effect. Ideally, the set of confounders is determined at the study design phase and based on subject matter knowledge. To quantify confounding bias, one could compare the unadjusted exposure effect estimate and the estimate from an inverse probability weighted model.

Longitudinal relationship between sitting time on a working day and vitality, work performance, presenteeism, and sickness absence

OBJECTIVE: The aim of this study was to explore the longitudinal relationship between sitting time on a working day and vitality, work performance, presenteeism, and sickness absence.METHODS: At the start and end of a five-month intervention program at the workplace, as well as 10 months after the intervention, sitting time and work-related outcomes were measured using a standardized self-administered questionnaire and company records. Generalized linear mixed models were used to estimate the longitudinal relationship between sitting time and work-related outcomes, and possible interaction effects over time.RESULTS: A significant and sustainable decrease in sitting time on a working day was observed. Sitting less was significantly related to higher vitality scores, but this effect was marginal (b = -0.0006, P = 0.000).CONCLUSIONS: Our finding of significant though marginal associations between sitting time and important work-related outcomes justifies further research.

Skillsbased werven en selecteren: experimenten naar het effect

Improving pupils’ conceptual understanding by a connected in-school and out-of-school science program: a multiple case study

The number of out-of-school science programs, which refers to science education at outside school environments, is gradually increasing. Although out-of-school programs are generally considered to be important for the development of pupils’ science knowledge and skills, more evidence concerning the learning effect of these programs is needed. In the present study, we explored whether different degrees of implementation of a connected in-school and out-of-school science program affect pupils’ cognitive science skills in relation to teachers’/instructors’ support. We used a multiple case study design with four cases comprising three different degrees of program implementation: optimal, intermediary and marginal. The cases comprised pupils of upper grade elementary school classes, their teachers, and the instructors of the out-of-school activity. The effect of the program was measured by coding pupils’ performance with a scale based on skill theory, and by coding teacher’s/instructor’s support with the Openness Scale. The data was gathered from microgenetic measurements over time, corresponding with an in-depth analysis of the process of change in naturalistic conditions. We found the highest learning effect in the optimal program implementation, which indicates that it is favorable to implement the complete program, and train teachers/instructors to use open teaching focused on conceptual understanding.

The Contrast-Ridden World of the Migrant Entrepreneur in the Urban Margins

In the Migrant’s Paradox, Suzanne Hall takes you on an excursion to the world of migrant shop proprietors in the urban margins of five UK cities, exposing it as a world full of controversies and contradictions.