The use of accelerometry in adolescents and its implementation with non-wear time activity diaries in free-living conditions

The aim of this study was to evaluate the use of a non-wearing time activity diary (hereafter non-wear activity diary) when using accelerometry in adolescents to provide insight into their physical activity levels. In total, 213 Belgian adolescents (89 boys, 124 girls) were eligible for this study. Adolescents wore an accelerometer for seven consecutive days and kept a non-wear activity diary. On the last day, they completed the International Physical Activity Questionnaire for Adolescents. The differences between the accelerometer data with and without use of the non-wear activity diary were significant for all physical activity intensities according to the Wilcoxon signed rank test. Bland-Altman plots showed that with more time spent in any physical activity intensity, the difference between including and not including the non-wear activity diary increased. The correlation coefficient between the International Physical Activity Questionnaire for Adolescents and the accelerometer data increased when the non-wear activity diary was included. Differences in the percentage of adolescents reaching the physical activity recommendations between the accelerometer data only and the accelerometer with the non-wear activity diary were significant. We conclude that if the non-wear activity diary data are not included, some adolescents could be misclassified as not being physically active according to the physical activity recommendations. It is therefore recommended to use a non-wear activity diary for gaining insight into the physical activity levels of individuals.     

Temporary contracts: effect on job satisfaction and personal lives of recent PhD graduates

In this study, we assess the effects of temporary employment on job satisfaction and the personal lives of recent PhD graduates. Temporary employment is becoming increasingly prevalent in many sectors, but has been relatively common in academia, especially for early career scientists. Labor market theory shows temporary employment to have a conspicuous negative influence on the job satisfaction and well-being of employees, but also identifies groups that may be exempt from these negative influences, such as the highly educated. Here, we study the effect of temporary employment on the highest educated group in the labor force, PhD graduates. We present findings of a survey of 1133 respondents who obtained their PhD from one of five Dutch universities between 2008 and 2012. Compared to PhDs employed on a permanent contract, PhDs on a temporary contract are less satisfied with their terms of employment, especially if they have no prospect of permanence. Temporary contracts with no prospect of permanence also decrease satisfaction with job content. Conversely, self-employment increases satisfaction with job content. Educational level required for the job also influences job satisfaction to a large degree: working below PhD level negatively affects job satisfaction. Finally, the type of contract affects different aspects of the personal lives of PhDs, such as the ability to obtain a mortgage, the stability of family life, and the possibility to start a family. In conclusion, we show that the highest educated, i.e., PhD graduates are not exempt from the negative influences of temporary employment.     

Perspectives on Age and Continuing Professional Development for Nurses: A Literature Review

The need for nurses to participate in continuing professional development (CPD) is growing to keep abreast of rapid changes in nursing care. Concurrently, the nursing workforce is growing older. Ageing leads to changes in biological, psychological, and social functioning. Little is known about the effects of age-related changes on nurses’ CPD. A literature review was conducted to examine whether and how CPD differs across age groups. A framework with five perspectives on age was used in an attempt to distinguish factors contributing to these age differences. Given the limited research on this topic with respect to nurses, we also included studies of workers in general. The literature search revealed 27 relevant studies. In general, older workers appeared less likely to participate in CPD, when considering formal learning activities and late-career workers (older than 50/55 years). We found no clear age patterns for motivation to participate in CPD, for learning outcomes, and for participation in informal and non-formal learning activities. The study showed that more nuanced results are found when studies distinguish at least three age groups. By using different perspectives of age, a comprehensive overview of age-related factors in CPD was generated and gaps in current research were identified. Recommendations for further research are discussed, such as the need for research on whether the types of learning activities that nurses undertake change with ageing.     

Student teachers’ knowledge about children with ADHD and depression and its relations to emotions

Student teachers’ knowledge about children with attention deficit hyperactivity disorder (ADHD) and depression and its relations to reporting experiencing emotions during teaching practice were studied. The participants were 186 teacher education students in Estonia. Student teachers’ general knowledge and confidence in knowledge varied a lot. Knowledge about children with ADHD was generally limited. Knowledge and confidence in knowledge were negatively related to reporting negative emotions (anxiety, anger, shame) experienced during teaching practice. Findings are discussed, taking into account recent changes in scientific knowledge about ADHD and depression and democratic changes in schools. As knowledge of special educational needs has become important due to applying inclusive education, the findings also refer to the need for modifications in teacher education curricula.     

The interactive attribution of school success in multi-ethnic schools

The study shows how explanations for school success are expressed and dialogically constructed during teacher–parent conferences at school. Attribution theory is used to conceptualize the various explanations for school success that were expressed. However, instead of only looking at attributions as beliefs which individuals or groups ‘have’, the aim of this study is to show how attributions are part of co-constructed processes in which multiple partners impact upon each other’s attributions over the course of a conversation. The results indicated that in the conversations between teachers and minority parents, school performance is more often attributed to effort while in conversations with majority parents, psychological attributions were more common. Besides these differences in content, the process through which these accounts were constructed was different. While the diagnosis on what went wrong was more commonly constructed in case of the conversations with majority parents, they were more characterised by opposition or a passive position by the parent in case of the conversations with minority parents. The analyses show that instead of a simple mismatch between explanations of the home and the school, these explanations are interactionally co-constructed as both parents and teachers necessarily ‘re’-act on each other’s claims and understanding of school success. The results ultimately reveal how the interactive process impacted upon the construction of the attributions and the possibilities this creates for partnerships between parents and teachers to create an understanding of the child’s academic potential across home and school.     

Conceptual and empirical differences among various value-added models for accountability

Accountability systems in education generally include indicators of student performance. However, these indicators often differ considerably among the various systems. More and more countries try to include value-added measures, mainly because they do not want to hold schools accountable for differences in their initial intake of students. This study presents a conceptual framework of these value-added measures, resulting in an overview of 5 different types. Using data from Dutch secondary schools, we empirically provide estimates of these different measures. Our analyses show that the correlation between the different types of school effects estimated is rather high, but that the different models implicate different results for individual schools. Based on theoretical considerations, arguments are given to use the following indicators in the value-added accountability models: prior achievement, student-level background characteristics, and compositional characteristics of the student population.     

Changes in student populations and average test scores of Dutch primary schools

This article focuses on the relation between student population characteristics and average test scores per school in the final grade of primary education from a dynamic perspective. Aggregated data of over 5,000 Dutch primary schools covering a 6-year period were used to study the relation between changes in school populations and shifts in mean test scores. Path analysis findings indicate that changes in student populations bring about instant changes in school averages. However, the impact of these changes is strongly mitigated by the effects of school results in the past. This reveals long-lasting effects of student population characteristics via past performance and explains the relative stability in raw output measures over time to a considerable extent.     

Individual differences in dynamic measures of verbal learning abilities in young twin pairs and their older siblings

We explored the genetic background of individual differences in dynamic measures of verbal learning ability in children, using a Dutch version of the Auditory Verbal Learning Test (AVLT). Nine-year-old twin pairs (N = 112 pairs) were recruited from the Netherlands Twin Register. When possible, an older sibling between 10 and 14 years old participated as well (N = 99). To assess verbal learning, non-linear curves were fitted for each child individually. Two parameters were estimated: Learning Speed (LS) and Forgetting Speed (FS). Larger twin correlations in monozygotic (MZ) than in dizygotic (DZ) and sibling pairs for LS and FS indicated the importance of genetic factors in explaining variation in these traits. The heritability estimate (percentage of variance explained by genetic factors) for LS was 43% for both twins and siblings. For FS heritability was estimated at 20% in twins and was slightly higher (30%) in their older siblings.     

RTP-based broadcast streaming of high definition H.264/AVC video: An error robustness evaluation

In this work, we present an evaluation of the performance and error robustness of RTP-based broadcast streaming of high-quality high-definition (HD) H.264/AVC video. Using a fully controlled IP test bed (Hillestad et al., 2005), we broadcast high-definition video over RTP/UDP, and use an IP network emulator to introduce a varying amount of randomly distributed packet loss. A high-performance network interface monitoring card is used to capture the video packets into a trace file. Purpose-built software parses the trace file, analyzes the RTP stream and assembles the correctly received NAL units into an H.264/AVC Annex B byte stream file, which is subsequently decoded by JVT JM 10.1 reference software. The proposed measurement setup is a novel, practical and intuitive approach to perform error resilience testing of real-world H.264/AVC broadcast applications. Through a series of experiments, we evaluate some of the error resilience features of the H.264/AVC standard, and see how they perform at packet loss rates from 0.01% to 5%. The results confirmed that an appropriate slice partitioning scheme is essential to have a graceful degradation in received quality in the case of packet loss. While flexible macroblock ordering reduces the compression efficiency about 1 dB for our test material, reconstructed video quality is improved for loss rates above 0.25%.     

Dyslexia and hormone deficiences

From a group of 75 children, originally selected as dyslectic on the basis of their reading and/or spelling problems relative to a total group of 1000 4.th grade children in the city of Trondheim, blood tests were obtained on 35 children. A control group of 45 children was drawn among the 1000 children. Among the 12 different hormones measured, significant differences came out on cortisol, triiodothyronine (T. 3), prolactin, and human growth hormone (HGH, somatotrophin) in boys and girls separately. A follow-up study of 22 dyslectic children from the same cohort gave results consistent with those obtained in the original study. The higher values of the dyslectic group on cortisol and prolactin may suggest the dyslectics to be in a stressful situation, possibly due to their language problems in school. The most striking difference, however, was the very low levels of HGH in the dyslectic group—to the extent that there was little overlap in the two distributions. This result was totally unexpected and is, in fact, opposite of what to be expected on the basis of at least short — time stress events. The results holds up when age and pubery development are controlled for.