The influence of student ethnicity on teacher expectations and teacher perceptions of warmth and competence

Background. Previous research shows that incorrect teacher expectations about students can affect students’ academic success. Moreover, students’ ethnicity was found to be one of the most influential characteristics affecting teacher expectations, which can be based on ethnic stereotypes. Most studies test this relationship by comparing teacher expectations of multiple ethnic groups; however, we propose here another perspective, assuming that the connection between ethnic stereotypes and expectations may be determined by the content of the stereotypes. Objective. This study examines the influence of students’ ethnicity on teacher expectations and stereotypes, as well as the relationship of teacher expectations and stereotypes toward ethnic minority students, by including the stereotype content model in the analysis. Design. Thirty-four primary school teachers participated in the experiment in which they analyzed six fictional profiles of students, two of which were experimental. The experimental profiles contained identical information (annual school grade, a teacher testimonial, gender), but differed in names of the students and their parents, and in their migration background. Thus, we manipulated only the information related to ethnicity and migration history of two students. Results. Teacher expectations about the performance of minority students were always unfavorable compared with expectations about the performance of the majority students, but their expectations about the abilities of minority and majority students, which include teachers’ beliefs about students’ educational skills, attitudes and motivation, and capacity for school work, were mixed. We also discovered that the teacher expectations were positively related to perceptions of competence and not to perceptions of warmth. However, the minority student was evaluated by teachers as just as warm and competent as the majority. Conclusion. This study shows the relevance of the problem of correct expectations of teachers toward students with different ethnic backgrounds. In contrast to the teachers’ perceptions of the warmth and competence of students, information about the ethnicity of the child influences their expectations. Meanwhile the teachers’ expectations are differently related to the various components of their stereotypes. The results raise a question about the definition and operationalization of teachers’ expectations

<i>Klebsiella pneumoniae</i> Susceptibility to Carbapenem/Relebactam Combinations: Influence of Inoculum Density and Carbapenem-to-Inhibitor Concentration Ratio

The inoculum effect (IE) is a well-known phenomenon with beta-lactams. At the same time, the IE has not been extensively studied with carbapenem/carbapenemase inhibitor combinations. The antibiotic-to-inhibitor concentration ratio used in susceptibility testing can influence the in vitro activity of the combination. To explore the role of these factors, imipenem/relebactam and doripenem/relebactam MICs were estimated against six Klebsiella pneumoniae carbapenemase (KPC)-producing Klebsiella pneumoniae strains at standard inocula (SI) and high inocula (HI) by two methods: with a fixed relebactam concentration and with a fixed, pharmacokinetic-based carbapenem-to-relebactam concentration ratio. The combination MICs at HI, compared to SI, increased with most of the tested strains. However, the IE occurred with only two K. pneumoniae strains regardless of the MIC testing method. The relationship between the MICs at SI and the respective inoculum-induced MIC changes was observed when the MICs were estimated at pharmacokinetic-based carbapenem-to-relebactam concentration ratios. Thus, (1) IE was observed with both carbapenem/relebactam combinations regardless of the MIC testing method; however, IE was not observed frequently among tested K. pneumoniae strains. (2) At HI, carbapenem/relebactam combination MICs increased to levels associated with carbapenem resistance. (3) Combination MICs determined at pharmacokinetic-based carbapenem-to-inhibitor concentration ratios predict susceptibility elevations at HI in KPC-producing K. pneumoniae