Causal Mediation Analysis With a Binary Outcome and Multiple Continuous or Ordinal Mediators: Simulations and Application to an Alcohol Intervention

We investigate a method to estimate the combined effect of multiple continuous/ordinal mediators on a binary outcome: (a) fit a structural equation model with probit link for the outcome and identity/probit link for continuous/ordinal mediators, (b) predict potential outcome probabilities, and (c) compute natural direct and indirect effects. Step 2 involves rescaling the latent continuous variable underlying the outcome to address residual mediator variance and covariance. We evaluate the estimation of risk-difference- and risk-ratio-based effects (RDs, RRs) using the maximum likelihood (ML), mean-and-variance-adjusted weighted least squares (WLSMV) and Bayes estimators in Mplus. Across most variations in path-coefficient and mediator-residual-correlation signs and strengths, and confounding situations investigated, the method performs well with all estimators, but favors ML/WLSMV for RDs with continuous mediators, and Bayes for RRs with ordinal mediators. Bayes outperforms ML/WLSMV regardless of mediator type when estimating RRs with small potential outcome probabilities and in two other special cases. An adolescent alcohol prevention study is used for illustration.     

Development of children with autism spectrum disorders in special needs education schools in the Netherlands: a three-year follow-up study

The purpose of the study was to investigate the development of symptomatology and academic growth of children with autism spectrum disorders (ASD) attending a special needs education school in the Netherlands as well as to explore the relationship between academic achievement and symptom reduction of those children. To this end a three-year follow up study was conducted by using multiple informants. The group of children with autism was compared with a group of children having other diagnoses but attending the same school. Results showed that teachers’ and parents’ perceptions about children’s symptomatology development differed significantly. Even though teachers reported a significant symptom reduction of ASD symptoms after two years of school attendance the parents of the same children did not. Furthermore, it was found that both groups of children had gains in different aspects of school-based cognitive skills; however, no association was found between symptom reduction and academic growth of the children. Implications of the study are discussed.     

Exploration of teaching strategies that stimulate the growth of academic skills of children with ASD in special education school

The cognitive growth of children with developmental disorders, like autism, can be seriously impaired due to the disorder. If so, in the Netherlands, these children can attend special schools where they are treated to ameliorate disorder symptoms and to stimulate cognitive growth. The aim of this paper was to identify teaching strategies that stimulate the growth of academic skills in children diagnosed with autism, attending a special needs education school in the Netherlands. Findings showed that the strongest underlying teaching strategy that predicted the academic growth of the children on the autism spectrum in the short and long term was the provision of structure in place, time and activities. It was further found that long-term academic gains were partly predicted by the emotional support from their teachers. The implications of the findings are discussed.     

Reclaiming tutorials as learning spaces in the sciences

ABSTRACT

Tutorials/discussion classes¹ are seen as an essential part of the teaching mix in the natural sciences, because that is where problems can be solved and course content is applied. Learning support provided by teaching assistants may free up the lecturer to do research, but are these assistants sufficiently well trained and well informed? Do tutorials offer learning spaces or merely activities to engage the willing student? In this paper I report on a study conducted in a science faculty of a research intensive university in South Africa. I collected data using interviews and questionnaires which gave insight into the many variants of tutor/teaching assistant² support that exist in the faculty. Practices that seem to lead to better student learning were also foregrounded. It became evident that lecturers need to plan their tutorials as an integral part of the learning space and not as an add-on activity.     

Recontextualizing the role of the facilitator in group interaction in the outdoor classroom

The traditional role of the facilitator in outdoor education is frequently seen as outside the group of participants, either in a position of power over the participants or detached and passive. Following an ethnographic study at a residential outdoor centre, an in-depth analysis of the facilitation process was carried out, which revealed that the facilitator is always part of the group, and that the type of influence that the facilitators have on the outdoor learning process depends on the way that they approach their role within the group. For the purpose of this paper, the term ‘facilitator’ is used to refer to both centre staff as well as visiting teachers accompanying the school groups. This paper addresses critical questions regarding the effectiveness of the outdoor learning process when a position of power is adopted. The paper will also show the impact that recognizing the facilitator as a member of the group has on the learning experience in the outdoor classroom.     

Elite athletes in aesthetic and Olympic weight-class sports and the challenge of body weight and body compositions

The use of dieting, rapid weight loss, and frequent weight fluctuation among athletes competing in weight-class and leanness sports have been considered a problem for years, but the extent of the problem and the health and performance consequences have yet to be fully examined. Most studies examining these issues have had weak methodology. However, results from this review indicate that a high proportion of athletes are using extreme weight-control methods and that the rules of some sports might be associated with the risk of continuous dieting, energy deficit, and/or use of extreme weight-loss methods that can be detrimental to health and performance. Thus, preventive strategies are justified for medical as well as performance reasons. The most urgent needs are: (1) to develop sport-specific educational programmes for athletic trainers, coaches, and athletes; (2) modifications to regulations; and (3) research related to minimum percentage body fat and judging patterns.     

CURRENT ARTICLES

In the post-pillarized society of the Netherlands, formal religious education still is structured according to religious dividing lines. “Religion” in confessional schools is a compulsory subject; in public schools, taking a so-called neutral position with regard to religious traditions, “Religion” is an optional subject (Protestant, Roman Catholic, or Islamic religious education or Humanistic World View Education), taught to pupils on parents’ request. Nowadays, due to processes of modernization, globalization, and individualization, the position of religion in society has changed and subsequently the position of “Religion” as a subject in classes has changed. These days for principals and teachers in public schools it is urgent to reflect on their positionality regarding (religious and secular) worldview education. In this contribution we present our findings from document analysis and from (focus group) interviews with principals, and from observations in public schools, resulting in a plea for “Life Orientation for all” as a compulsory subject in all schools for all pupils.     

Public perceptions of teachers’ status in Flanders

Schools have increasingly been targeted as appropriate sites for mental health promotion and teachers are considered well placed to identify issues concerning students’ social and emotional well-being. Whilst teachers are now expected to be responsive to a wide range of student needs and circumstances, they receive little in their pre-service and subsequent teacher education to adequately prepare them for such realities. This paper reports the findings of a study that investigated teacher perspectives on student mental health and mental health education, including their sense of self-efficacy in relation to promoting and supporting children’s mental well-being in schools. These findings highlight a complex interplay between teachers’ constructions of ‘mental health’, the importance they place on mental health promotion in schools, issues of teacher confidence, role identity conflict and school culture, as well as teachers’ own sense of mental well-being. The discussion signals a need to pay close attention to the assumptions, values, beliefs and attitudes of teachers in relation to children’s mental health since these are integral to their confidence and skill in supporting children’s social and emotional well-being.