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Investing mental effort is costly, and the investment has to be matched by a reward to make a person engage in task performance. However, the neural structures underlying the continued management of mental effort are not known. Previous work has identified left-lateralized structures, most prominently the left anterior Insular Cortex (aIC) as regions implied in post-hoc evaluation and also anticipation of mental effort investment. We present a study aimed at identifying neural structures that are sensitive to changes in both task load and fatigue-induced state load. Sixteen healthy participants performed an n-back task before and after a fatigue-inducing day in a helicopter simulator or a free day. Subjective mental effort ratings showed an interaction of the effects of both task and state load changes, with a reduced effect of task load during the fatigued state. Testing for the same interaction effect in a whole-brain functional MRI data, we found a left-lateralized group of clusters in aIC, the anterior cingulate cortex, the dorsal striatum and frontal eye field and M1. We discuss the possible role of these areas and also the relevance of our findings in the light of the proposed opportunity cost model of mental effort.

The Guest Editors also wish to acknowledge the Leverhulme Trust (UK), the Spanish Psycologists’ Association (Consejo Nacional de Colegios Oficiales de Psicólogos, COP-CV and COP’s Division on Work, Organizations and Personnel Psychology), the Valencian Government (Conselleria de Educación, Generalitat Valenciana), the University of Valencia and the European Association of Work, and Organizational Psychology (EAWOP) for their kind funding contributions that made this Special Issue possible.

Objectives The aim of this paper is to propose a new model of sustainable employability based on the capability approach, encompassing the complexity of contemporary work, and placing particular emphasis on work-related values.Methods Having evaluated existing conceptual models of work, health, and employability, we concluded that prevailing models lack an emphasis on important work-related values. Amartya Sen’s capability approach (CA) provides a framework that incorporates a focus on values and reflects the complexity of sustainable employability.Results We developed a model of sustainable employability based on the CA. This model can be used as starting point for developing an assessment tool to investigate sustainable employability.Conclusions A fundamental premise of the CA is that work should create value for the organization as well as for the worker. This approach challenges researchers, policy-makers, and practitioners to investigate what people find important and valuable – what they would like to achieve in a given (work) context – and moreover to ascertain whether people are able and enabled to do so. According to this approach, it is not only the individual who is responsible for achieving this; the work context is also important. Rather than merely describing relationships between variables, as existing descriptive models often do, the CA depicts a valuable goal: a set of capabilities that constitute valuable work. Moreover, the CA fits well with recent conceptions of health and modern insights into work, in which the individual works towards his or her own goals that s/he has to achieve within the broader goals of the organization.Key terms: Amartya Sen; capability approach; employability; model; quality of working life; sustainable employability; work

Stakeholder theory may help health promoters to make changes at the organizational and policy level to promote health. A stakeholder is any individual, group, or organization that can influence an organization. The organization that is the focus for influence attempts is called the focal organization. The more salient a stakeholder is and the more central in the network, the stronger the influence. As stakeholders, health promoters may use communicative, compromise, deinstitutionalization, or coercive methods through an ally or a coalition. A hypothetical case study, involving adolescent use of harmful legal products, illustrates the process of applying stakeholder theory to strategic decision making.

The present study investigates the potential benefits of a team's shared knowledge and standardized communication in adapting to an unforeseen change by combining literature on adaptation and team performance. Each of 20 teams performed a dynamic team task and was suddenly confronted with a simulated partial system breakdown. Results show that a methodological framework designed to describe performance adaptation to an unforeseen change in individuals can also be used to model performance adaptation in teams. The system failure was followed by a performance drop and a subsequent period of gradual performance recovery. Accuracy of teams' shared knowledge correlated positively with performance before and after the change, confirming and extending the literature on shared mental models. However, the amount of knowledge similarity did not aid teams in adapting to the unforeseen system breakdown. In addition, improving teams' standardized communication had no damping effect on the sudden performance drop and neither helped them during the subsequent recovery period. These results show that even though shared knowledge and efficient communication are of high value to team performance and success, these characteristics are limited in aiding adaptive team performance after unforeseen unique changes that force team members to update their strategies.

This study examined the effects of a professional development programme aimed at equipping teachers for the challenges of teaching in urban schools. The contribution of the programme to teacher quality and teacher retention was evaluated using a mixed research design in which both quantitative (N = 133) and qualitative (N = 42) approaches were used. The results showed a significant effect of the programme on teacher knowledge and self-efficacy. Furthermore, teachers greatly appreciated the programme and they perceived a positive impact on their competences, self-efficacy and professional orientation. The opportunity to share experiences within a network of teachers was considered the most valuable element of the programme.

Introduction In pediatric epilepsy, comorbidities are reported to be frequent. The present study focusedon the cognitive patterns of children with isolated epilepsy, children with isolated neurodevelopmental disorders (reading disorders, math disorders, autism spectrum disorders), and children with epilepsy and these neurodevelopmental disorders as comorbidities. Methods Based on two samples of referred children, one with epilepsy, reading disorders, math disorders, or ASDs occurring in “ isolation ” ( n = 117) and one with reading disorders, math disorders, and ASDs occurring comorbid with epilepsy ( n = 171), cognitive patterns were compared. The patterns displayed by verbal and nonverbal abilities from the WISC series were studied with repeated measures ANOVA. Thereafter, an exploratory 2 ∗ 3 ∗ 2 factorial analysis was done to study the independent contribution of the type of comorbidity and of the presence or absence of epilepsy to the VIQ–PIQ pattern. Results In isolated epilepsy, a VIQ > PIQ pattern was found, which was not seen in the other disorders. When epilepsy and another disorder co-occurred, patterns were altered. They resembled partly the pattern seen in isolated epilepsy and partly the pattern seen in the isolated neurodevelopmental disorder. In comorbid reading disorders, the VIQ > PIQ pattern was mitigated; in comorbid math disorders, it was exacerbated. In comorbid ASDs, no clear pattern emerged. In the presence of epilepsy, patterns characteristic of isolated disorders appeared systematically shifted toward relatively lowered performance abilities or relatively spared verbal abilities. The similar “impact” exerted by epilepsy on the patterns of the various conditions suggested shared mechanisms.

Background: Practice guidelines for childhood posttraumatic stress disorder (PTSD) recommend trauma-focused psychotherapies, mainly cognitive behavioral therapy (CBT). Eye movement desensitization and reprocessing (EMDR) therapy is a brief trauma-focused, evidence-based treatment for PTSD in adults, but with few well-designed trials involving children and adolescents. Methods: We conducted a single-blind, randomized trial with three arms (n = 103): EMDR (n = 43), Cognitive Behavior Writing Therapy (CBWT; n = 42), and wait-list (WL; n = 18). WL participants were randomly reallocated to CBWT or EMDR after 6 weeks; follow-ups were conducted at 3 and 12 months posttreatment. Participants were treatment-seeking youth (aged 8–18 years) with a DSM-IV diagnosis of PTSD (or subthreshold PTSD) tied to a single trauma, who received up to six sessions of EMDR or CBWT lasting maximally 45 min each. Results: Both treatments were well-tolerated and relative to WL yielded large, intent-to-treat effect sizes for the primary outcomes at posttreatment: PTSD symptoms (EMDR: d = 1.27; CBWT: d = 1.24). At posttreatment 92.5% of EMDR, and 90.2% of CBWT no longer met the diagnostic criteria for PTSD. All gains were maintained at follow-up. Compared to WL, small to large (range d = 0.39–1.03) intent-to-treat effect sizes were obtained at posttreatment for negative trauma-related appraisals, anxiety, depression, and behavior problems with these gains being maintained at follow-up. Gains were attained with significantly less therapist contact time for EMDR than CBWT (mean = 4.1 sessions/140 min vs. 5.4 sessions/227 min). Conclusions: EMDR and CBWT are brief, trauma-focused treatments that yielded equally large remission rates for PTSD and reductions in the severity of PTSD and comorbid difficulties in children and adolescents seeking treatment for PTSD tied to a single event. Further trials of both treatments with PTSD tied to multiple traumas are warranted.

The Chronic Sleep Reduction Questionnaire is a validated questionnaire that measures symptoms of prolonged insufficient and/or poor sleep and therefore accounts for individuals' sleep need and sleep debt. This study extends its psychometric properties by providing cut-off scores, using a matched sample of 298 healthy adolescents (15.38 +/- 1.63years, 37.9% male, mean Chronic Sleep Reduction Questionnaire score: 32.98 +/- 6.51) and 298 adolescents with insomnia/delayed sleep-wake phase disorder (15.48 +/- 1.62years;37.9% male, mean Chronic Sleep Reduction Questionnaire score: 42.59 +/- 7.06). We found an area under the curve of 0.84 (95% confidence interval: 0.81-0.87). Cut-off scores for optimal sensitivity, optimal specificity and based on Youden's criterion are provided. These cut-off scores are highly relevant for use of the Chronic Sleep Reduction Questionnaire in future studies and clinical practice.

Rationale: The development of evidence-based treatment guidelines for pediatric pulmonary arterial hypertension (PAH) is hampered by lack of pediatric clinical trials. Trial design is hampered by lack of a feasible clinical endpoint in this population.Objectives: To evaluate the use of accelerometry for measuring physical activity (PA) in pediatric PAH and to investigate its correlation with clinical disease severity markers.Methods: We included children from the Dutch National Network for Pediatric Pulmonary Hypertension. Control patients were recruited from the outpatient cardiology clinic of the Beatrix Children's Hospital. Children were asked to wear the accelerometer for 7 days. Vector magnitude counts per minute (VMCPM) and time per day spent in different PA intensity levels were defined as accelerometer outcomes.Measurements and Main Results: VM CPM was lower in children withPAH(n = 29) than in controls (n = 60; 647 vs. 921; P Conclusions: PA is markedly decreased in children with PAH. Accelerometer output correlated with clinical disease severity markers and may predict outcome. We showed an exciting potential of PA as a meaningful endpoint for clinical trials in pediatric PAH, although its clinical utility and prognostic value need to be further validated.

Stress in children and adolescents is common and related to many developmental problems. However, most studies have made no distinction between temporary or chronic stress due to the lack of a suitable questionnaire. This study tested the factor structure, reliability and validity of the 17-item self-report Chronic Stress Questionnaire for Children and Adolescents (CSQ-CA) in three samples, that is, 717 adolescents from the general population, 161 adolescents of parents with a severe chronic medical condition (CMC) like multiple sclerosis, and 113 adolescents with healthy parents. Results showed that a one-factor solution provided a reasonable fit overall. Reliability was good (α = .80 to .88). Convergent validity was supported by positive relations between total stress scores and internalizing and externalizing problem behaviors, experience of daily hassles, and maladaptive emotion regulation strategies and negative relations with quality of life, happiness, mindfulness, self-esteem, and coping skills. Adolescents from all samples, who themselves had a light CMC like asthma, showed higher chronic stress levels than those without a CMC. In line, adolescents of parents with a severe CMC reported more chronic stress than those of healthy parents, and adolescents with a chronic illness themselves and a parent with a chronic illness, showed the highest scores across the two family types. Overall, this study presents good psychometric properties of the first available measure of chronic stress in children and adolescents.

The concept of 'recovery' (from work) has quickly gained in importance in the occupational health literature. However, we think that the conceptualization of 'recovery' needs some more attention. Although many authors acknowledge that 'recovery' refers to a 'process', the concept is often treated as a static construct. In this paper, we argue that recovery should be conceptualized as a dynamic construct related to changes in psychophysiological state of the person. We refer to two main theories that have provided a theoretical framework for research in this area: Meijman & Mulder's Effort-Recovery (E-R) model and Hobfoll's Conservation of Resources theory. In particular, the E-R model has been seminal in this area and stresses the element of changing psychophysiological states that has been used for reconceptualising 'recovery'. Various biological rhythms influence these changing psychophysiological states, and thus the level of energy (or effort) a person can mobilize or wants to mobilize. A distinction is made between 'physical fatigue' and 'mental fatigue' and its consequences for recovery. The discrepancy between 'actual state' and 'required state' has been suggested as the basis for 'recovery'. This emphasises that recovery is a dynamic and ongoing process, which also included motivational aspects, in particular as far as mental work is concerned. The capacity to maintain self-regulation of one's psychophysiological state is important in this respect. Thus, we propose that 'recovery' is the continuous process of harmonizing the 'actual state' with the state that is 'required' at that moment.

Pulmonary arterial hypertension (PAH) is a severe and progressive intrinsic disease of the precapillary lung vasculature. Since the introduction of PAH-targeted drugs, survival of PAH patients seems to have improved. Randomized controlled trials have led to evidence-based guidelines to direct treatment in adults. However, since disease characteristics differ between adults and children, it is hazardous to simply extrapolate these guidelines to children. Moreover, pediatric data on treatment strategies and how to assess treatment response remain virtually absent. Optimal treatment strategies are highly needed to guide therapy and improve survival in children with PAH. This review provides an overview of currently available treatments for PAH and the limited efficacy and safety data in children (with the exclusion of perinatal pulmonary vascular diseases, as persistent pulmonary hypertension of the newborn). We also discuss potential treatment goals and how the available data can be translated into treatment strategies in pediatric PAH.

Objectives In order to describe survival and treatment strategies in pediatric pulmonary arterial hypertension (PAH) in the current era of PAH-targeted drugs and to identify predictors of outcome, we studied uniformly defined contemporary patient cohorts at 3 major referral centers for pediatric PAH (New York [NY], Denver, and the Netherlands [NL]). Background In pediatric PAH, discrepancies exist in reported survival rates between North American and European patient cohorts, and robust data for long-term treatment effects are lacking. Methods According to uniform inclusion criteria, 275 recently diagnosed consecutive pediatric PAH patients who visited the 3 referral centers between 2000 and 2010 were included. Results Unadjusted survival rates differed between the center cohorts (1-, 3-, and 5-year transplantation-free survival rates: 100%, 96%, and 90% for NY; 95%, 87%, and 78% for Denver; and 84%, 71%, and 62% for NL, respectively; p Conclusions Survival rates of pediatric PAH patients differed between 3 major referral centers. This could be explained by differences between the center cohorts in patients’ diagnoses and measures of disease severity, which were identified as important predictors of outcome. In this study, treatment with PAH-targeted combination therapy during the study period was independently associated with improved survival.

Objective: To study the pattern of cognitive development in relation to duration of epilepsy. Methods: Participants were 113 children with epilepsy referred because of concerns about their cognitive development and tested at least twice at tertiary epilepsy settings. Verbal, Performance, and Full Scale IQ were measured with Wechsler Intelligence Scales. Various epilepsy and demographic variables were included. Change over time was modeled with multilevel analysis for longitudinal data with variable measurement occasion.Results: The Verbal and Full Scales could be fitted best as a downward progressing function. Earlier in time, decline was likely to be largest; later in time, decline followed a continuous, dwindling course. A similar trend was seen for the Performance Scale. Initially, Verbal IQ was higher than Performance IQ but this discrepancy decreased over time. Later onset of epilepsy was associated with an attenuated decline of the Verbal Scale. None of the other epilepsy variables were related to the course of cognitive development. Higher parental education was associated with higher IQ, but was not protective against decline.Conclusions: Verbal IQ, though initially spared, drops. The Performance IQ, which may have shown its vulnerability earlier in the course of the epilepsy, shows overall smaller changes. It is suggested that seizures impact synergistically on an affected brain, which leads to progressive cognitive decline. Earlier onset of epilepsy is associated with relatively higher VIQ, larger VIQ > PIQ discrepancies and more decline.

Inquiry-based working by teachers includes working with an inquiry habit of mind, being data literate, contributing to a culture of inquiry at the school level, and creating a culture of inquiry at the classroom level. Inquiry-based working has been found to contribute to educational improvements and the professionalisation of teachers. This study investigates the relationship between psychological factors – attitude, experienced social pressure, self-efficacy and collective efficacy – and inquiry-based working by teachers. Questionnaire data were collected from a representative sample of 249 Dutch teachers. The results show a significant relationship between self-efficacy and all aspects of inquiry-based working. In addition, collective efficacy, attitude and experienced social pressure are all related to aspects of inquiry-based working. School leaders and teacher educators who aim to stimulate inquiry-based working should not only focus on increasing teachers’ inquiry skills, but also on psychological factors related to inquiry-based working.

PurposeThe purpose of this paper is to improve the understanding of psychological factors that influence inquiry-based leadership. This study investigates how affective attitude, experienced social pressure, and self-efficacy relate to aspects of inquiry-based school leadership. A school leader’s inquiry habit of mind, data literacy, and the extent to which he or she creates a culture of inquiry in the school are each identified as aspects of inquiry-based leadership.Design/methodology/approachData were collected from questionnaires completed by a sample of 79 school leaders.FindingsA significant relationship was found between self-efficacy regarding inquiry-based leadership and all aspects of inquiry-based leadership. Affective attitude toward inquiry-based leadership was significantly related to creating a culture of inquiry. There was no unique relationship between experienced social pressure and inquiry-based leadership.Practical implicationsAdministrators and educators of school leaders who aim to stimulate inquiry-based school leadership should not only focus on increasing the capacity of school leaders to lead their school in an inquiry-based way, but they should also focus on leaders’ self-efficacy and on fostering leaders’ positive attitude toward inquiry-based school leadership. Administrators and educators can, for example, give positive feedback, emphasize the added value of inquiry-based leadership, encourage working with critical friends, and stimulate collaboration with other leaders.Originality/valueThis study addresses two gaps in the existing research, by focusing on inquiry-based leadership instead of data use and on psychological factors instead of knowledge and skills that are related to this type of leadership.

Background The intervention Home-Start is a wide spread program in a number of countries, among which the Netherlands. In Home-Start, trained volunteers visit families with young children in need of support once or twice a week to help them to deal with problems in family life and parenting. Little is known, however, about the effects of Home-Start. This study describes short-term and long term changes in families that participated in Home-Start. Methods Three groups of families with young children (at the start mean age 1 1/2 years) were followed over a period of four years. One of the groups of families participated in the Home-Start family support program in the first 6.6 months of this period. The two other groups were (1) a randomly selected community sample and (2) a group of families with elevated parenting stress and a need for support. Data were collected at the beginning of the study, (after median 1.4 months), directly after the intervention (median 6.6 months) and at two follow-up occasions (respectively, median 12.5 and 49.2 months after the first measurement). At the last measurement, data were available for 33, 45 and 34 families respectively. Results Multilevel analysis showed more positive changes in parental wellbeing, competence and behavior (more consistent behavior and less rejection) during the intervention period in the Home-Start group than in the two other groups. At the three year follow up, the Home-Start group showed, compared to the other groups, more improvements in parenting (more responsiveness), but also diminished child externalizing and internalizing behavior problems (less oppositional defiant behavior, affective problems and anxiety problems). Conclusions Home-Start seems a promising family support intervention that deserves to be studied more extensively.

Work-related rumination, that is, perseverative thinking about work during leisure time, has been associated with a range of negative health and wellbeing issues. The present paper examined the association between work-related rumination and cognitive processes centerd around the theoretical construct of executive functioning. Executive functioning is an umbrella term for high level cognitive processes such as planning, working memory, inhibition, mental flexibility; and it underlies how people manage and regulate their goal directed behavior. Three studies are reported. Study I, reports the results of a cross-sectional study of 240 employees, and demonstrates significant correlations between work-related rumination and three proxy measures of executive functioning: cognitive failures (0.33), cognitive flexibility (-0.24), and situational awareness at work (-0.28). Study II (n = 939), expands on the findings from study 1 and demonstrates that workers reporting medium and high work-related rumination were 2.8 and 5 times, respectively, more likely to report cognitive failures relative to low ruminators. High ruminators also demonstrated greater difficulties with 'lapses of attention' (OR = 4.8), 'lack of focus of attention' (OR = 3.4), and 'absent mindedness' (OR = 4.3). The final study, examined the association between work-related rumination and executive functioning using interview data from 2460 full time workers. Workers were divided into tertiles low, medium, and high. The findings showed that high work-related rumination was associated with deficits in starting (OR = 2.3) and finishing projects (OR = 2.4), fidgeting (OR = 1.9), memory (OR = 2.2), pursuing tasks in order (OR = 1.8), and feeling compelled to do things (OR = 2.0). It was argued that work-related rumination may not be related to work demands per se, but appears to be an executive functioning/control issue. Such findings are important for the design and delivery of intervention programes aimed at helping people to switch off and unwind from work.

With the development of an MCMC algorithm, Bayesian model selection for the p2 model for directed graphs has become possible. This paper presents an empirical exploration in using approximate Bayes factors for model selection. For a social network of Dutch secondary school pupils from different ethnic backgrounds it is investigated whether pupils report that they receive more emotional support from within their own ethnic group. Approximated Bayes factors seem to work, but considerable margins of error have to be reckoned with. © VVS, 2005.

Robert Roe, 1944-2016 F.R.H. Zijlstra, Gedrag & Organisatie, volume 29, June 2016, nr. 2, pp. 102-105 In this obituary, the life and work of Robert Roe (1944-2016) are remembered. Robert Roe was a passionate and analytical organizational psychologist, who influenced many scholars and practitioners in the Netherlands and abroad with his work on personnel selection, activity research, and the use of the time concept in organizational research.

Background and ObjectivesDuring the past decades, blood transfusions have become an ever safer clinical procedure in developed countries. Extensive donor screening together with improved infectious disease testing has led to a minimization of risks for transfusion recipients. Still, the general public perceives the process of blood transfusion as risky.Materials and MethodsThis study tested variation in perceived transfusion safety across countries and explained it with individual and country factors. We examined whether individual demographic and macro-level factors (i.e. Human Development Index and Power Distance Index) explain variation within and across European countries. We applied multilevel models to 2009 Eurobarometer data collected in 26 countries (N = 20 874).ResultsResults were largely in line with expectations derived from risk perception and power and status difference theories. Generally, women, older adults, the lower educated and those earning lower incomes perceived heightened risk. Most of the variation across Europe was explained by the Human Development Index. Risk perception regarding blood transfusions was lower in countries with higher Human Development Indices, that is countries with higher average education, life expectancy and Gross Domestic Product.ConclusionThis study provides new insights of how risk perception regarding blood transfusions is shaped within and across Europe. Both individual demographic factors and country characteristics play a role.

Many organizations rely on the functioning of teams. In this study we focus on swift-starting teams-that is, ad hoc teams formed for immediate task performance, such as emergency or rescue teams or aviation crews, with highly trained members who have generally not previously worked together as a team. Previous research suggests that teams develop task performance capability over time, but that stable patterns of interaction in teams emerge very quickly. We suggest that these interaction patterns help swift starting teams engage in immediate task performance. In particular, we hypothesize that effective teams will exhibit more interaction patterns, but fewer unique patterns, than less effective teams. We describe an observational study of 18 swift-starting aviation crews. Our results identify the early emergence of specific interaction patterns and indicate significant differences between the patterns of effective and ineffective crews. The effective teams in our sample exhibited patterns that were more stable in duration, more stable in complexity, and more reciprocal as compared to those of less effective teams. We close with implications for work on team interaction, and suggestions for future research and team trainers.

There has been a growing interest in evidence-based management. A core component is a body of high-quality research evidence to inform practice. Initial research with human resource managers in the United States and the Netherlands reveals only modest knowl- edge about a number of 'widely documented' research findings. However, it is unclear whether research experts would display any greater agreement about the research evidence. The present study addresses this issue by exploring levels of agreement about the quality of the research evidence base in work and organizational (W/O) psychology using a pan-European sample of 75 senior academic W/O psychologists who completed two rounds of a study, first identifying core findings in the field of W/O psychology and then reporting levels of agreement about them. The results show that there were only seven of 24 core findings on which over 75% agreed that there was good-quality evidence. The challenges of developing and utilizing an evidence-based approach are discussed and it is concluded, in agreement with Briner and Rousseau (2011a), that there is some way to go before W/O psychologists can begin to feel confident about the quality of much of their research evidence.

Various cognitive and physical abilities are found to decline with age. However, contrary to popular belief, it still remains a topic of disc whether these declines in abilities actually affect old...

The relationship between recovery, work pressure and sleep quality: A diary study The relationship between recovery, work pressure and sleep quality: A diary study Alicia L.T. Walkowiak, Ute R.Hülsheger & Fred R.H. Zijlstra, Gedrag & Organisatie, volume 23, December 2010, nr. 4, pp. 316-332. Previous research showed that the experience of high work pressure can lead to fatigue and even to health complaints on the long term. This makes it very important, especially for people who experience high work pressure, to take sufficient time to recover after work. Sleep quality has a positive influence on recovery. The aim of this diary study was to investigate whether sleep quality has a mediating effect on the relationship between work pressure and recovery. Seventy-six people took part in the study and answered questions about work, recovery and sleep for 14 days. Results showed that work pressure indeed had a negative effect on recovery and sleep quality. Furthermore, we found a partial mediation effect: sleep quality mediated the relationship between work pressure and recovery. These results stress the importance of recovery and sleep quality, especially for people who experience high work pressure.

Deze bijdrage is bedoeld om een aanzet te geven tot een discussie. De discussie richt zich op de vraag of er speciale maatregelen genomen moeten worden om oudere werknemers aan het werk te houden/helpen, en zo ja, welke? Ten aanzien van oudere werknemers bestaan er vele opvattingen en misverstanden.

The p(2) model is a statistical model for the analysis of binary relational data with covariates, as occur in social network studies. It can be characterized as a multinomial regression model with crossed random effects that reflect actor heterogeneity and dependence between the ties from and to the same actor in the network. Three Markov chain Monte Carlo (MCMC) estimation methods for the p2 model are presented to improve iterative generalized least squares (IGLS) estimation developed earlier, two of which use random walk proposals. The third method, an independence chain sampler, and one of the random walk algorithms use normal approximations of the binary network data to generate proposals in the MCMC algorithms. A large-scale simulation study compares MCMC estimates with IGLS estimates for networks with 20 and 40 actors. It was found that the IGLS estimates have a smaller variance but are severely biased, while the MCMC estimates have a larger variance with a small bias. For networks with 20 actors, mean squared errors are generally comparable or smaller for the IGLS estimates. For networks with 40 actors, mean squared errors are the smallest for the MCMC estimates. Coverage rates of confidence intervals are good for the MCMC estimates but not for the IGLS estimates.

European research in Work and Organizational Psychology traditionally has a phenomenological orientation, favours comprehensive models, and stresses the role of individuals and situational factors in the work process. This means that individual characteristics of employees and the notion of cognitive regulation within situations have a prominent place. In this study, we used a framework that incorporates both these aspects as determinants of work behaviour (Roe & Zijlstra, 1991) and applied this in research on psychological climate. Based on survey data from 406 hospital employees, we tested a model that specified organizational citizenship behaviour as a mediator of relationships between individual factors (psychological climate and self-efficacy) and work outcomes (quality of performance and emotional exhaustion). The results demonstrated support for our hypothesized model of how work behaviour mediates the relationship between these antecedents and outcomes. Practical implications and future research directions are discussed.

The guidelines of the European Commission on corporate social responsibility stress the importance of sustainable employment for people with disabilities. The road to employment is however paved with obstacles, such as the often negative stereotypes and attitudes of employers and employees, which influence the treatment of people with disabilities at the work floor. In the present study, we build upon the Reasoned Action Approach to illuminate how and when stereotypes of employees toward people with disabilities relate to inclusive behavior at work. In a sample of 313 employee-colleague dyads, we found that the relationship between stereotypes (rated by employees) and inclusive behavior (rated by colleagues) is mediated by employee attitudes toward the employment of people with disabilities (targets). Moreover, work pressure functions as a boundary condition that shapes the relationship between stereotypes and inclusive behavior, in such a way that the relationship is stronger when work pressure is low. Research and practical implications are discussed in conclusion.

Ethnic boundaries were tested in students' networks in 34 Flemish and 19 Dutch high schools. Each network consisted of a school cohort in an intermediate level of education (track). While students from the native majority predominantly had friendships within their own ethnic category, minority students often had more inter-ethnic than intra-ethnic friendships. However, a multilevel p2 model for analysing the networks showed that this was due mainly to the quantitative dominance of native students in the networks. Native students were more inclined than minority students to engage in inter-ethnic friendships. The study found ethnic boundaries to be stronger in the Dutch networks than in the Flemish networks. It is unclear whether this is due to methodological reasons or to more substantial differences between the Netherlands and Flanders.

For this study, information on Who Bullies Who was collected from 54 school classes with 918 children (M age = 11) and 13,606 dyadic relations. Bullying and victimization were viewed separately from the point of view of the bully and the victim. The two perspectives were highly complementary. The probability of a bully-victim relationship was higher if the bully was more dominant than the victim, and if the victim was more vulnerable than the bully and more rejected by the class. In a bully-victim dyad, boys were more often the bullies. There was no finding of sex effect for victimization. Liking reduced and disliking increased the probability of a bully-victim relationship.

In the Netherlands, the Dutch government instituted policies that enable persons with profound intellectual and multiple disabilities (PIMD) to attend day services. Over the past 15 years, surveys have indicated a progressive increase in the number of hours that such adults spend at day activities centers. However, information about how these hours are spent is lacking. This study was designed to sample 7 residential centers to determine the amount of time spent in day activities centers, the number of hours that were spent on fixed programming or individually orientated activities, and what types of activities were prominent. Results showed that persons with PIMD spent, on average, 14.2 h per week at day activities centers. Of that time, 28.9% was spent on group activities and 13.0% on individual activities. Whether these activities could be considered purposeful or productive for an individual participant is unknown. The authors question whether the policies of the Dutch government aimed at enabling persons with PIMD to enjoy purposeful, rather than just longer, activities during the day, have been productively implemented.

BACKGROUND: Clinical worsening (CW), an increasingly used composite end point in adult pulmonary arterial hypertension (PAH), has not yet been evaluated in pediatric PAH. This study aims to evaluate the usefulness of CW in pediatric PAH by assessing the event incidence and prognostic value of each separate component of CW and of the composite CW end point.METHODS: Seventy pediatric patients with PAH from the Dutch National Network for Pediatric Pulmonary Hypertension, who started PAH-targeted therapy between January 2000 and January 2014, were included in the study and underwent standardized follow-up. The following CW components were prospectively registered: death, lung transplantation (LTx), PAH-related hospitalizations, initiation of IV prostanoids, and functional deterioration (World Health Organization functional-class deterioration, >= 15% decrease in 6-min walk distance, or both). The longitudinal event incidence and prognostic value were assessed for each separate component and their combination.RESULTS: The end-point components of death, LTx, hospitalizations, initiation of IV prostanoids, and functional deterioration occurred with a longitudinal event rate of 10.1, 2.5, 21.4, 9.4 and 48.1 events per 100 person-years, respectively. The composite CW end point occurred 91.5 times per 100 person-years. The occurrences of either hospitalization, initiation of IV prostanoids, or functional deterioration were predictive of death or LTx (P CONCLUSIONS: CW occurred with a high event incidence and each of the soft end-point components was predictive of death or LTx. This supports the usefulness of CW as a study end point in clinical trials in pediatric PAH.

De samenleving wordt steeds complexer, en aan het verrichten van arbeid worden steeds hogere eisen gesteld. Dit heeft als gevolg dat een steeds groter wordende groep mensen niet meer in staat is om te participeren in reguliere arbeid. Dit lijkt in tegenspraak met de bedoelingen van recente wetgeving, zoals de Participatiewet. Deze wet heeft namelijk als uitgangspunt dat iedereen die over enig arbeidsvermogen beschikt, regulier dient te werken. Dit leidt ertoe dat werknemers in de Sociale Werkvoorziening met een (geschat) arbeidsvermogen van meer dan 30% regulier geplaatst moeten worden. Het leidt er ook toe dat de beoordelingscriteria om voor een volledige Wajong-uitkering in aanmerking te komen aanmerkelijk aangescherpt worden. Het gevolg is dat deze groep met (beperkte) arbeidsmogelijkheden zich op de reguliere arbeidsmarkt moet begeven. Om voor de doelgroep van mensen die niet zelfstandig in staat zijn om het minimuminkomen te verdienen, de kansen op de reguliere arbeidsmarkt te vergroten, hebben werkgevers en overheid afgesproken dat zij in de komende tien jaar 125.000 extra banen (100.000 door het reguliere bedrijfsleven en 25.000 door de rijksoverheid) zullen creeren. Als werkgevers en overheid er niet in slagen om dit aantal te realiseren, zal de Quotumwet in werking treden. De vraag of deze maatregelen effectief zullen zijn, wordt bepaald door de vraag wat de reele kansen op de arbeidsmarkt zijn voor mensen die nu aangewezen zijn op een beschermde werkplek (Sociale Werkvoorziening) of met een uitkering thuis zitten.

This paper reports a comparison of nurses affected by the restructuring associated with healthcare organization mergers (1998-2000) in the United Kingdom and those of non-affected nurses in the UK.Restructuring, a feature of healthcare organizations for decades, has been associated internationally with negative outcomes for nurses. Despite this, no model to evaluate management of change factors and psychological stress processes has been operationalized and tested.A sample of 351 Registered Nurses was recruited from southern England. Participants either worked in organizations that were within 6 months of merging or were not affected by mergers. On two occasions, 6 months apart, all were sent a questionnaire that had been formulated for the study. Questions related to the parts of the model being tested: restructuring initiatives (i.e. stressors) information and participation, coping action, and coping effectiveness (i.e. outcomes). The data were collected between 1998 and 2000.Nurses affected by mergers reported statistically significantly higher restructuring initiatives before and after an event than non-affected nurses. Moreover, up to 12 months after an event some affected nurses reported lower information and participation, and lower coping effectiveness (i.e. higher job insecurity, job stress, job pressure, lower job satisfaction, physical, psychological, and environmental quality of life) than non-affected nurses, which was consistent with the model's proposals. However, there was no difference between affected and non-affected nurses' coping action.The psychological effects of restructuring are linked with perceptions of low information and participation, and with negative outcomes for nurses. Managers, therefore, need to communicate information and encourage staff to participate in decisions about restructuring events.

The p 2 model is a random effects model with covariates for the analysis of binary directed social network data coming from a single observation of a social network. Here, a multilevel variant of the p 2 model is proposed for the case of multiple observations of social networks, for example, in a sample of schools. The multilevel p 2 model defines an identical p 2 model for each independent observation of the social network, where parameters are allowed to vary across the multiple networks. The multilevel p 2 model is estimated with a Bayesian Markov Chain Monte Carlo (MCMC) algorithm that was implemented in free software for the statistical analysis of complete social network data, called StOCNET. The new model is illustrated with a study on the received practical support by Dutch high school pupils of different ethnic backgrounds.

Stress and fatigue caused by work require daily recovery periods to offset future deleterious consequences to mental and physical health. The aim, therefore, of the current study was to gain insight into recovery processes during a normal week. The main hypotheses were that more time spent on work and work-related activities will have a negative impact on recovery, while more time spent on specific leisure activities would have a beneficial impact on recovery. Using diaries, 46 respondents (average age of 35) provided daily measures of fatigue, sleep, and time spent on recovery activities over 7 days. Recovery activities included time spent on activities that were social, physical, and work-related. Results indicated that whilst low effort and social activities are nonbeneficial to recovery, physical activities significantly predict recovery (i.e., the former increase fatigue whilst the latter decrease fatigue). Sleep quality also emerges as a significant predictor of recovery. The weekend respite appears important to recovery; however, the effect seems already to wane on Sunday evening in anticipation of the Monday workload. The article provides insights into leisure activities and the experience of fatigue.

Sleep problems and sleep restriction are popular topics of discussion, but few representative data are available. We document Britain's sleep based on a nationally representative sample of 1997, 16-93 year olds, who participated in face-to-face interviews. Fifty-eight per cent of respondents reported sleep problems on one or more nights the previous week and 18% reported that the sleep they obtained was insufficient on the majority of nights. Sleep durations were longest in the youngest participants (16-24 years), who slept on average 1 h longer than the 7.04 (SD 1.55) sample average. Sleep duration showed no appreciable change beyond middle age. Men and women reported sleeping similar amounts but women reported more sleep problems. Men reported sleeping less when there were more children in their household. Workers (i.e. employees) reported sleeping less on workdays than on non-workdays, but those based at home and those not employed did not. Inability to switch off from work was related to sleep duration on non-workdays. Across all participants average sleep duration exhibited a non-monotonic association with quality of life (i.e. contribution of sleep to energy, satisfaction and success in work, home and leisure activities). Quality of life was positively associated with sleep duration, for durations up to 9 h, but negatively associated with quality of life beyond this. Comparison of our data with the US national sleep poll revealed that Britain sleeps as little or less, whereas a comparison with data reported 40 years ago revealed no statistically reliable reductions. Although we may not sleep less than four decades ago, when we report sleeping less we also tend to associate that lack of sleep with poor performance and quality of life.

Simon J. Beavington-Penney and Andrew J. Barnett write: Vennin et al . (2003) have provided an interesting study of the Ypresian (Eocene) El Garia Formation of Tunisia. This unit has been the subject of numerous studies, largely because it reservoirs hydrocarbons within the Gulf of Gabes (e.g. Loucks et al . 1998; Racey et al . 2001; Jorry et al . 2003). Because of the economic significance of this unit, its correct interpretation, especially in terms of the continuity and correlation of depositional sequences (and, therefore, reservoir layering) is crucial. Using the well-studied outcrops to the west of Kairouan in north-central Tunisia, Vennin et al . (2003) present a sequence stratigraphic model of the El Garia Fm. Their high-resolution model recognizes three orders of depositional sequences (third to fifth), with their ‘small-scale’ cycles occurring as individual decimetre- to metre-scale beds (which, they suggest, fall within the range of the duration of Milankovitch cycles) and groups of these beds which form metre- to decametre-scale, fifth-order packages. Vennin et al . (2003) claim that this hierarchy of cycles was produced by a nested hierarchy of eustatic sea-level change. We would like to suggest that these cycles (and the invoked causal sea-level change) are debatable, not least because they contain no unambiguous evidence of relative sea-level change (i.e. subtidal deposits capped directly by subaerial exposure surfaces). The El Garia Fm. was deposited over a period of approximately 2.8 Ma (Racey et al . 2001), during which time several third-order sea-level changes might be expected to have occurred. However, earlier studies from both outcrop and subsurface (offshore Tunisia borehole core) have not noted widespread surfaces that can be correlated within the El Garia Fm. (such as the Fe-rich hardgrounds which Vennin et al . (2003) record as bounding their fifth-order cycles) and have …

A random effects model is proposed for the analysis of binary dyadic data that represent a social network or directed graph, using nodal and/or dyadic attributes as covariates. The network structure is reflected by modeling the dependence between the relations to and from the same actor or node. Parameter estimates are proposed that are based on an iterated generalized least-squares procedure. An application is presented to a data set on friendship relations between American lawyers.

The goals of this study are to investigate, at three elementary school grade levels, how word reading speed is related to rapidly naming series of numbers, letters, colors, and pictures, and to general processing speed (measured by nonnaming or visual matching tasks), and also to determine how these relationships vary with the reading task employed. The results indicate that, compared to color- and picture-naming speeds and nonnaming or visual matching speed, letter- and number-naming speeds are superior predictors of word reading speed. Furthermore, throughout the grade levels, associations between alphanumeric naming and monosyllabic word reading speeds are considerably stronger than for a widely used Dutch single-word reading test combining monosyllabic and multisyllabic words. It is suggested that, unlike multisyllabic words but similar to letters and numbers, monosyllabic words act as relatively holistic stimuli, which are recognized as sight words.

A three-dimensional high resolution sequence stratigraphic model of an Ypresian nummulitic carbonate ramp and organic-rich basin is presented based on outcrops in Central Tunisia. The sedimentation pattern is influenced by the interplay of different orders of variations in eustatic sea-level (third to fifth order), the pre-existing palaeotopography, and probably some synsedimentary tectonism (differential subsidence). Time-equivalent rocks deposited in a comparable structural and depositional setting along the northern margin of the African plate are hydrocarbon bearing (Tunisia and Libya). This example may thus serve as an outcrop analogue for this petroleum system, providing valuable information on the sub-seismic-scale distribution pattern, geometries and heterogeneities of both the reservoir and source rock facies. The studied outcrops cover an area of 10 by 20 km where present-day valleys provide three-dimensional access to the rocks. In addition, the transition from the inner/mid-ramp, with nummulitic reservoir facies, to the carbonate source rocks in the basin is exposed in continuous outcrops. This transition takes place in about 3 km, a distance generally beyond the resolution of well spacing. Based on the physical tracing of beds, and the recognition of three orders of depositional sequences (third to fifth) a high resolution time framework is constructed. The accumulation of large nummulites (best reservoir facies) is stratigraphically controlled, and occurs in the transgressive phases of the landward-stepping fourth order cycles (overall transgression). Carbonate production was at that time so high that aggrading geometries are observed during these transgressive pulses. Our observations show that size, morphology and reproduction strategy of foraminiferal assemblages and, particularly, nummulites and Discocyclina , are related to changes in water depth and, consequently, in accommodation space. A regional east–west cross-section shows significant thickness variations of the Ypresian succession that were probably controlled by synsedimentary differential subsidence. The detailed, sub-seismic-scale, geometrical information on stratal patterns and lateral facies change are quantified, and used in a 3D numerical stochastic modelling (HERESIM) of this petroleum system.

Although the role of social support in promoting employees' health and well-being has been studied extensively, the evidence is inconsistent, sometimes even suggesting that social support might have negative effects. The authors examined some psychological processes that might explain such effects. On the basis of the threat-to-self-esteem model, the authors tested the hypothesis that receiving imposed support elicits negative reactions, which are moderated by someone's need for support. The authors distinguished 3 different reactions: (a) self-related, (b) interaction-related, and (c) physiological. The results of an experiment with 48 temporary administrative workers generally confirmed the hypothesis. Imposed support elicited negative reactions, except when there was an unsolvable problem, but even then the effect of imposed support was not positive but neutral.

The collaboration of schools in networks is increasingly regarded as an important means for improving education. In networks teachers experience other educational practices and have the possibility to be part of a broader educational community. Compared with more traditional means of professional development in schools, in networks practice and theory go together. Despite the wide support for networks as a strong vehicle for changing education not much is known about what goes on in networks and what the participants think of networking. In this article we address these questions for our network.

We investigated the relationship between deep acting, automatic regulation and customer tips with 2 different study designs. The first study was a daily diary study using a sample of Dutch waiters and taxi-drivers and assessed the link of employees' daily self-reported levels of deep acting and automatic regulation with the amount of tips provided by customers (N = 166 measurement occasions nested in 34 persons). Whereas deep acting refers to deliberate attempts to modify felt emotions and involves conscious effort, automatic regulation refers to automated emotion regulatory processes that result in the natural experience of desired emotions and do not involve deliberate control and effort. Multilevel analyses revealed that both types of emotion regulation were positively associated with customer tips. The second study was an experimental field study using a sample of German hairdressers (N = 41). Emotion regulation in terms of both deep acting and automatic regulation was manipulated using a brief self-training intervention and daily instructions to use cognitive change and attentional deployment. Results revealed that participants in the intervention group received significantly more tips than participants in the control group.

Background Despite the introduction of targeted therapies in pediatric pulmonary arterial hypertension (PAH), prognosis remains poor. For the definition of treatment strategies and guidelines, there is a high need for an evidence-based recapitulation of prognostic factors. The aim of this study was to identify and evaluate prognostic factors in pediatric PAH by a systematic review of the literature and to summarize the prognostic value of currently reported prognostic factors using meta-analysis. Methods and results Medline, EMBASE and Cochrane Library were searched on April 1st 2014 to identify original studies that described predictors of mortality or lung-transplantation exclusively in children with PAH. 1053 citations were identified, of which 25 were included for further analysis. Hazard ratios (HR) and 95% confidence intervals were extracted from the papers. For variables studied in at least three non-overlapping cohorts, a combined HR was calculated using random-effects meta-analysis. WHO functional class (WHO-FC, HR 2.7), (N-terminal pro-) brain natriuretic peptide ([NT-pro]BNP, HR 3.2), mean right atrial pressure (mRAP, HR 1.1), cardiac index (HR 0.7), indexed pulmonary vascular resistance (PVRi, HR 1.3) and acute vasodilator response (HR 0.3) were identified as significant prognostic factors (p≤0.001). Conclusions This systematic review combined with separate meta-analyses shows that WHO-FC, (NT-pro)BNP, mRAP, PVRi, cardiac index and acute vasodilator response are consistently reported prognostic factors for outcome in pediatric PAH. These variables are useful clinical tools to assess prognosis and should be incorporated in treatment strategies and guidelines for children with PAH.