The structural equivalence of tourism cooperative network in the Belt and Road Initiative Area.

This study constructed the international tourism cooperation network (ITCN) in the Belt and Road Initiative area and further analyzed the structural equivalence of the tourism cooperative network by block-modeling approach through Convergence of iterated Correlations CONCOR algorithm in UCINET 6 data set. The results displayed the layout of subgroups: The East Europe, North Asia-Pacific and South Asia were in core positions; Middle East, the Americas and Africa were at margins of the network. Besides, each inter-block relational pattern and the status of each block had been presented. The sociogram of inter-block density highlighted the importance of reciprocal ties. These ties were mainly constructed between core blocks, but seldom constructed between peripheral blocks. The degree of competition derived from structural equivalence can be balanced through the implementation of intra-block differential strategy and the design of inter-block relational patterns.

Characterization and safety evaluation of HPPD W336, a modified 4-hydroxyphenylpyruvate dioxygenase protein, and the impact of its expression on plant metabolism in herbicide-tolerant MST-FGØ72-2 soybean.

By transgenic expression technology, a modified 4-hydroxyphenylpyruvate dioxygenase enzyme (HPPD W336) originating from Pseudomonas fluorescens is expressed in MST-FGØ72-2 soybean to confer tolerance to 4-benzoyl isoxazole and triketone type of herbicides. Characterization and safety assessment of HPPD W336 were performed. No relevant sequence homologies were found with known allergens or toxins. Although sequence identity to known toxins showed identity to HPPD proteins annotated as hemolysins, the absence of hemolytic activity of HPPD W336 was demonstrated in vitro. HPPD W336 degrades rapidly in simulated gastric fluid. The absence of toxicity and hemolytic potential of HPPD W336 was confirmed by in vivo studies. The substrate spectrum of HPPD W336 was compared with wild type HPPD proteins, demonstrating that its expression is unlikely to induce any metabolic shifts in soybean. The potential effect of expression of HPPD W336 on metabolic pathways related to tyrosine was investigated by comparing seed composition of MST-FGØ72-2 soybean with non-genetically modified varieties, demonstrating that expression of HPPD W336 does not change aromatic amino acid, homogentisate and tocochromanol levels. In conclusion, HPPD W336 was demonstrated to be as safe as other food proteins. No adverse metabolic effects were identified related to HPPD W336 expression in MST-FGØ72-2 soybean.

The Experience in Personal Social Systems Questionnaire (EXIS.pers): Development and Psychometric Properties.

This study presents the theoretical background, development, and psychometric properties of the German and English versions of the Experience in Personal Social Systems Questionnaire (EXIS.pers). It assesses how the members of a personal social system experience their situation within that system. It is designed as a research tool for interventions in which only one member of the system participates (e.g., Family Constellation Seminars). The EXIS.pers was created to measure change on the individual level relating to one's own important personal social system. In Study 1, we used exploratory factor analysis (EFA) for latent variable identification of the original German EXIS.pers (n = 179). In Studies 2 and 3, we used confirmatory factor analysis (CFA) to examine the dimensionality of the German (n = 634) and English (n = 310) EXIS.pers. Internal consistencies and cross-cultural structural equivalence were assessed. EFA indicated that a four-factor model provided best fit for the German EXIS.pers. For both the German and English EXIS.pers, CFA provided the best fit for a five-factor bi-level model that included a general factor (Experience In Personal Social Systems) and four dimensions (Belonging, Autonomy, Accord, Confidence). Good internal consistencies, external associations, and cross-cultural structural equivalence were demonstrated. This study provides first evidence for the German and English EXIS.pers as an economical and reliable measure of an individual's experience within his or her personal social systems.

Psychometric testing of the Italian and French versions of the Care Dependency Scale.

AIM: The aim of this study was to test psychometrically the Italian and French versions of the Care Dependency Scale. BACKGROUND: The Care Dependency Scale assesses changes in patients' level of care dependency including important functional and mental dimensions. Evaluation of the psychometric properties of the Italian version is still ongoing. The French version has to date not been validated. DESIGN: Nationwide cross-sectional point prevalence study. METHOD: Data were extracted from the national, annual prevalence survey of hospital-acquired pressure ulcers and inpatient falls in Swiss acute care hospitals in 2011. A total of 799 Italian and 1068 French-speaking patients were included in the analysis. For the evaluation, the psychometric properties were tested for each language both separately and conjointly. RESULTS: The scales revealed high internal consistency. Factor analysis presented a one-factor solution for both versions separately as well as combined. Comparison of internal structure revealed an excellent degree of equivalence between the versions. Highly significant Spearman correlations between the Care Dependency Scale and the Braden Scale sum scores indicated satisfactory criterion validity. CONCLUSION: Both the Italian and the French versions of the Care Dependency Scale showed satisfactory psychometric properties and a high level of equivalence. Further psychometric testing, using modern test theory approaches, is required. However, the scale is recommended as a valid instrument for further use in Italian and French.

Cross-Cultural and Gender Differences in ADHD Among Young Adults.

OBJECTIVE: This study explored the effect of cultural and gender differences in ADHD among Spanish, African American, Hispanic American, and European American young adults. METHOD: Structural equivalence between the four groups was examined by Tucker's phi coefficient. A MANCOVA was carried out with cultural groups and gender as factors and age as covariate. RESULTS: Structural equivalence was observed across all groups, and no differential item functioning was found. No significant effect was found for gender, although, with the exception of the Hispanic group, males scored higher than females. Furthermore, small, though significant, cultural differences were found. The lowest levels of ADHD were observed in the European American group and the highest in the Hispanic American group. ADHD symptoms, notably inattention, showed some decline with age. CONCLUSION: Findings extend existing data and suggest a relationship between culture and the development of ADHD, which might be mediated by parenting style.

Do Cross-National and Ethnic Group Bullying Comparisons Represent Reality? Testing Instruments for Structural Equivalence and Structural Isomorphism.

Bullying in schools is a widespread phenomenon, witnessed worldwide, with negative consequences for victims and perpetrators. Although it is an international issue, there are several issues with cross-national and cross-cultural/ethnic research that can make comparisons between countries and cultures/ethnic groups difficult including language, cultural perception, and/or methodological issues. As statistical techniques rapidly develop, there may be more scope to be statistically creative in how we assess the utility of one tool across different groups such as cultures, nations, etc. At the very least, an attempt to do this should be paramount in studies investigating different groups (e.g., from different countries) at one time. This study investigated bullying and victimization rates in a large cross-ethnic and -country comparison between adolescents from four countries and five different ethnic groups including: Israel (Jewish Israelis and Arab Palestinian Israelis), Palestine (the Gaza Strip), Germany, and Greece. A total of 3,186 school children aged 12-15 years completed self-report questionnaires of peer bullying/victimization. A stepwise data analytic approach was used to test comparability of the psychometric properties: (1) Structural equivalence contributes to the valid use of the instrument in cultural contexts other than the one for which the instrument has been developed. Structural equivalence is a necessary condition for the justification of indirect or direct comparisons between cultural groups. (2) Additionally, structural isomorphism is necessary to demonstrate that the same internal structure of the instrument applies to the cultural and individual levels. Findings support the internal structural equivalence of the questionnaire with the exception of the Palestinian sample from the Gaza Strip. Subsequently, exploratory factor analysis on the cultural level structure revealed a one-factor structure with congruence measure below 0.85. Thus, no evidence was found for internal structural isomorphism suggesting that no direct comparisons of cultural samples was justified. These results are discussed in detail and the implications for the international research community and cross-national/-ethnic comparison studies in bullying are addressed.

Cluster-randomized Studies in Educational Research: Principles and Methodological Aspects.

An increasing number of studies are being performed in educational research to evaluate new teaching methods and approaches. These studies could be performed more efficiently and deliver more convincing results if they more strictly applied and complied with recognized standards of scientific studies. Such an approach could substantially increase the quality in particular of prospective, two-arm (intervention) studies that aim to compare two different teaching methods. A key standard in such studies is randomization, which can minimize systematic bias in study findings; such bias may result if the two study arms are not structurally equivalent. If possible, educational research studies should also achieve this standard, although this is not yet generally the case. Some difficulties and concerns exist, particularly regarding organizational and methodological aspects. An important point to consider in educational research studies is that usually individuals cannot be randomized, because of the teaching situation, and instead whole groups have to be randomized (so-called "cluster randomization"). Compared with studies with individual randomization, studies with cluster randomization normally require (significantly) larger sample sizes and more complex methods for calculating sample size. Furthermore, cluster-randomized studies require more complex methods for statistical analysis. The consequence of the above is that a competent expert with respective special knowledge needs to be involved in all phases of cluster-randomized studies. Studies to evaluate new teaching methods need to make greater use of randomization in order to achieve scientifically convincing results. Therefore, in this article we describe the general principles of cluster randomization and how to implement these principles, and we also outline practical aspects of using cluster randomization in prospective, two-arm comparative educational research studies.

An analysis of patient-sharing physician networks and implantable cardioverter defibrillator therapy.

The application of social network analysis to the organization of healthcare delivery is a relatively new area of research that may not be familiar to health services statisticians and other methodologists. We present a methodological introduction to social network analysis with a case study of physicians' adherence to clinical guidelines regarding use of implantable cardioverter defibrillators (ICDs) for the prevention of sudden cardiac death. We focus on two hospital referral regions (HRRs) in Indiana, Gary and South Bend, characterized by different rates of evidence-based ICD use (86% and 66%, respectively). Using Medicare Part B claims, we construct a network of physicians who care for cardiovascular disease patients based on patient-sharing relationships. Approaches for weighting physician dyads and aggregating physician dyads by hospital are discussed. Then, we obtain a set of weighted network statistics for the positions of hospitals in their referral region, global statistics for the physician network within each hospital, and of the network positions of individual physicians within hospitals, providing the mathematical specification and sociological intuition underlying each measure. We find that adjusting for network measures can reduce the observed differences between referral regions for evidence-based ICD therapy. This study supports previous reports on how variation in physician network structure relates to utilization of care, and motivates future work using physician network measures to examine variation in evidence-based medicine.

Factorial Invariance of the Physical Activity Neighborhood Environment Survey Among Single- Versus Multi-Family Housing Residents.

PURPOSE: Individual perceptions of one's neighborhood environment influence decisions about physical activity participation. Differences between single-family housing neighborhoods versus multi-family housing neighborhoods may affect perceptions and lead to varying responses on surveys designed to assess perceptions of the neighborhood environment for physical activity. This study tested the factorial invariance for the Physical Activity Neighborhood Environment Survey (PANES) between residents of single-family versus multi-family housing neighborhoods. METHOD: This study was a secondary data analysis of PANES ratings from African American and Hispanic or Latina women (n = 324) who participated in the Health Is Power study (NCI R01CA109403), a multi-site, community-based trial to investigate the relationship between neighborhood factors and physical activity adoption and maintenance. Factorial invariance was tested using a series of nested confirmatory factor analysis models. RESULTS: The final model was a 2nd-order factor structure with partial invariance of item intercepts. The 2nd-order factor structure and the relationships of the PANES items to the 1st-order factors (amenable, unsafe, and walkable) and of the 1st-order factors to the 2nd-order factor (environment) were invariant between the single-family and multi-family housing neighborhood groups. CONCLUSION: These findings support the construct validity of PANES, which can be considered valid for measuring neighborhood perceptions among residents of neighborhoods with different housing types.

Structural Equivalence of an Attitude Toward Religion Scale in Mexico, Nicaragua and China / Equivalencia estructural de una escala de actitud hacia la religión en México, Nicaragua y China

The Attitude toward Catholicism, Judaism, Hinduism, and Islam scales (Francis & Enger, 2002; Francis & Katz, 2007; Francis, Santosh, Robbins, & Vij, 2008; Sahin & Francis, 2002) were adapted for this study into a single scale that measures overall attitudes towards religion. The resulting Attitude toward Religion (ATR) Scale was adapted into both Spanish and Chinese and administered in Mexico (n = 265), Nicaragua (n = 296), and China (n = 460) to a total of 1,021 individuals (59% women, 41% men; Mage = 22.4 years, SD = 7.01 years). The scale's structural equivalence (i.e. Does the instrument measure the same construct in each country?) was assessed using Exploratory Factor Analyses and pairwise comparisons. Strong evidence for structural equivalence was provided by the analyses' results, as we obtained a one-dimensional solution (labeled Attitude Toward Religion, ATR) in all three countries and Tucker's Phi test was very close to 1. These findings support the unidimensional solution for attitudes toward religions obtained in previous scales and broaden the scope for these studies in several cultural contexts. Further implications are discussed.

Las Escalas de Actitudes hacia el Catolicismo, Judaismo, Hinduismo e Islam (Francis & Enger, 2002; Francis & Katz, 2007; Francis, Santosh, Robbins, & Vij, 2008; Sahin & Francis, 2002) fueron adaptadas en este estudio a una sola escala que evalúa actitudes globales hacia la religión. La escala resultante de Actitudes Hacia la Religión (AHR) fue adaptada a español y chino y fue administrada en México (n=265), Nicaragua (n=296) y China (n=460) a una muestra total de 1021 individuos (59% mujeres, 41% hombres; Medad=22.4 años, DE = 7.01 años). La equivalencia estructural de la escala (¿El instrumento mide el mismo constructo en cada pais?) fue evaluada utilizando Análisis Factoriales Exploratorios y comparaciones por pares. Los resultados muestran evidencia sólida de equivalencia estructural, ya que se obtuvo una solución unidimensional (a la que se llamó Actitud Hacia la Religión) en los tres países y el valor de Phi de Tucker fue muy cercano a 1. Estos hallazgos apoyan la solución unidimensional de actitudes hacia la religión obtenida por investigaciones previas y amplian el alcance de estos estudios en diferentes contextos culturales. Otras implicaciones también se discuten a profundidad.