An empirical Kaiser criterion

In exploratory factor analysis (EFA), most popular methods for dimensionality assessment such as the screeplot, the Kaiser criterion, or—the current gold standard—parallel analysis, are based on eigenvalues of the correlation matrix. To further understanding and development of factor retention methods, results on population and sample eigenvalue distributions are introduced based on random matrix theory and Monte Carlo simulations. These results are used to develop a new factor retention method, the Empirical Kaiser Criterion. The performance of the Empirical Kaiser Criterion and parallel analysis is examined in typical research settings, with multiple scales that are desired to be relatively short, but still reliable. Theoretical and simulation results illustrate that the new Empirical Kaiser Criterion performs as well as parallel analysis in typical research settings with uncorrelated scales, but much better when scales are both correlated and short. We conclude that the Empirical Kaiser Criterion is a powerful and promising factor retention method, because it is based on distribution theory of eigenvalues, shows good performance, is easily visualized and computed, and is useful for power analysis and sample size planning for EF

Quality assessment of scientific manuscripts in peer review and education

We report a vignette study and a survey to investigate which study characteristics influence quality ratings academics give of articles submitted for publication, and academics and students give of students’ theses. In the vignette study, 800 respondents evaluated the quality of an abstract of studies with small or large sample sizes, showing statistically significant or non-significant results, and containing statistical reporting errors or no errors. In the survey, the same participants rated the importance of 29 manuscript characteristics related to the study’s theory, design, conduct, data analyses, and presentation for assessing either the quality of a manuscript or its publishability (article) or grade (thesis). Results showed that quality ratings were affected by sample sizes but not by statistical significance or the presence of statistical reporting errors in the rated researchvignette. These results suggest that researchers’ assessments of manuscript quality are not responsible for publication bias. Furthermore, academics and students provided highly similar ratings of the importance of different aspects relevant to quality assessment of articles and theses. These results suggest that quality criteria for scientific manuscripts are already adopted by students and are similar for submitted manuscripts and theses

Autonomy deficits as vulnerability for anxiety:Evidence from two laboratory-based studies

Background Autonomous individuals are characterized by self-governance; awareness of and capacity to realize one’s wishes and needs, while being connected with and sensitive towards others. In line with earlier research showing consistent associations between autonomy-connectedness deficits and anxiety, we tested in two studies whether autonomy deficits predict anxious responses to acute stressors. Methods In Study 1, participants (N = 177) viewed an anxiety-inducing film fragment and reported anxiety before and after viewing the clip. In experimental Study 2, participants (N = 100) were randomly allocated to one of two conditions: giving a short presentation to an audience (impromptu speech task) or watching another person’s presentation (control condition). Anxiety was measured at baseline, after a preparation period and directly after the presentation. Results In Study 1, individuals’ anxiety in reaction to watching the movie was positively associated with the autonomy-connectedness component sensitivity to others. In Study 2, individuals’ anxiety in reaction to preparing the presentation was negatively associated with the autonomy-connectedness component self-awareness. Conclusions Specific autonomy components may be related to experiencing anxiety in differing situations (i.e., related to others’ distress or presenting one’s personal views). Collectively these results indicate that autonomy-connectedness deficits may form a vulnerability factor for experiencing anxiety

Associations between lifestyle factors and multidimensional frailty:A cross-sectional study among community-dwelling older people

BACKGROUND: Multidimensional frailty, including physical, psychological, and social components, is associated to disability, lower quality of life, increased healthcare utilization, and mortality. In order to prevent or delay frailty, more knowledge of its determinants is necessary; one of these determinants is lifestyle. The aim of this study is to determine the association between lifestyle factors smoking, alcohol use, nutrition, physical activity, and multidimensional frailty. METHODS: This cross-sectional study was conducted in two samples comprising in total 45,336 Dutch community-dwelling individuals aged 65 years or older. These samples completed a questionnaire including questions about smoking, alcohol use, physical activity, sociodemographic factors (both samples), and nutrition (one sample). Multidimensional frailty was assessed with the Tilburg Frailty Indicator (TFI). RESULTS: Higher alcohol consumption, physical activity, healthy nutrition, and less smoking were associated with less total, physical, psychological and social frailty after controlling for effects of other lifestyle factors and sociodemographic characteristics of the participants (age, gender, marital status, education, income). Effects of physical activity on total and physical frailty were up to considerable, whereas the effects of other lifestyle factors on frailty were small. CONCLUSIONS: The four lifestyle factors were not only associated with physical frailty but also with psychological and social frailty. The different associations of frailty domains with lifestyle factors emphasize the importance of assessing frailty broadly and thus to pay attention to the multidimensional nature of this concept. The findings offer healthcare professionals starting points for interventions with the purpose to prevent or delay the onset of frailty, so community-dwelling older people have the possibility to aging in place accompanied by a good quality of life

Autonomy–connectedness, self-construal, and acculturation:Associations with mental health in a multicultural society

The present study investigated the associations between self-construal, acculturation, and autonomy?connectedness, as well as the relations between autonomy?connectedness and psychopathological symptoms, controlling for self-construal and acculturation. Participants were 1,209 Dutch individuals, of whom 693 (57.3%) were immigrants with a non-Western background. Results showed that an independent self-construal was positively associated with self-awareness and capacity for managing new situations, and was negatively associated with sensitivity to others (which are the three components of autonomy?connectedness). Moreover, an interdependent self-construal was negatively associated with self-awareness and capacity for managing new situations, and was positively associated with sensitivity to others. Importantly, the latter associations were similar for both Dutch natives and immigrants, and the associations between acculturation and autonomy?connectedness were small and nonsignificant. Autonomy?connectedness, after controlling for self-construal and acculturation, explained a large amount of additional variance in anxiety (12.7%) and depression (14.1), and a medium amount of additional variance in drive for thinness (3.7%) and bulimia (4.8%). Autonomy?connectedness, thus, seems to be an important construct for people with a Western background, as well as for immigrants with a non-Western background

The role of autonomy-connectedness in stress-modulating effects of social support in women:An experimental study using a virtual Trier Social Stress Test

Social support is associated with mental well-being and favorable therapy outcomes. As autonomy-connectedness, the capacity for self-governance in interpersonal context, may affect reliance on others, we investigated whether stress-modulating effects of social support are moderated by autonomy-connectedness. Ninety-seven undergraduates completed measures on autonomy-connectedness and trait social anxiety, and attended a laboratory session with a friend (support) or alone (control). All underwent a virtual Trier Social Stress Test and completed anxiety, cortisol and heart rate (variability) measures. Preregistered analyses revealed that social support reduced anxiety reactivity and delayed heart rate variability decreases, but not heart rate. Contrary to hypotheses, autonomy-connectedness did not predict stress-reactivity or interact with condition. Exploratory analyses suggested effects of social support on cortisol reactivity and indicated that reported support quality varied by trait anxiety and self-awareness. Our findings underline the stress-modulating effects of social support and suggest that social support can benefit individuals with varying levels of autonomy-connectedness

Home-visiting interventions for families with complex and multiple problems:A systematic review and meta-analysis of out-of-home placement and child outcomes

Children growing up in families experiencing complex and multiple problems (FECMP) are at an increased risk of developing problems in multiple areas of life. A wide array of home-visiting interventions has been developed to address the complex care needs of these families. The aim of this study is to investigate out-of-home placement rates and child outcomes of these home-visiting interventions. A systematic review and meta-analysis was conducted using five scientific databases (PsycInfo, ERIC, SocIndex, MedLine, & Picarta). The systematic search of these databases yielded 8,377 hits. Forty-two publications reporting on 50 studies were included in the review. A random-effects survival curve meta-analysis model was estimated for out-of-home placement and random-effects meta-analysis models were estimated for children's behavioral problems and stressful experiences. Out-of-home placement increased from 7.5% at case closure to 24.3% one year after case closure. On average there was a moderate decrease in emotional and behavioral problems (d = 0.50) and stressful experiences (d = 0.50) during intervention, but considerable problems remained after case closure. More research is needed to investigate family and service characteristics that may explain heterogeneity in outcomes. Furthermore, there is a need to adopt a broader perspective in evaluations of home-visiting services by including outcomes related to the skills, development, and wellbeing of children

Computed tomography for myocardial characterization in ischemic heart disease:a state-of-the-art review

This review provides an overview of the currently available computed tomography (CT) techniques for myocardial tissue characterization in ischemic heart disease, including CT perfusion and late iodine enhancement. CT myocardial perfusion imaging can be performed with static and dynamic protocols for the detection of ischemia and infarction using either single- or dual-energy CT modes. Late iodine enhancement may be used for the analysis of myocardial infarction. The accuracy of these CT techniques is highly dependent on the imaging protocol, including acquisition timing and contrast administration. Additionally, the options for qualitative and quantitative analysis and the accuracy of each technique are discussed