Research on the predictors of 3 bully status groups (bullies, victims, and bully victims) for school-age children and adolescents was synthesized using meta-analytic procedures. The primary purpose was to determine the relative strength of individual and contextual predictors to identify targets for prevention and intervention. Age and how bullying was measured were also considered as moderators. From an original pool of 1,622 studies conducted since 1970 (when research on bullying increased significantly), 153 studies were identified that met criteria for inclusion. A number of common and unique predictors were found for the bully status groups. The implications of the meta-analytic findings for future research on bullying and victimization prevention and intervention are discussed.

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We carried out a test sample study to try to identify errors leading to irreproducibility, including incompleteness of peptide sampling, in LC-MS-based proteomics. We distributed a test sample consisting of an equimolar mix of 20 highly purified recombinant human proteins, to 27 laboratories for identification. Each protein contained one or more unique tryptic peptides of 1250 Da to also test for ion selection and sampling in the mass spectrometer. Of the 27 labs, initially only 7 labs reported all 20 proteins correctly, and only 1 lab reported all the tryptic peptides of 1250 Da. Nevertheless, a subsequent centralized analysis of the raw data revealed that all 20 proteins and most of the 1250 Da peptides had in fact been detected by all 27 labs. The centralized analysis allowed us to determine sources of problems encountered in the study, which include missed identifications (false negatives), environmental contamination, database matching, and curation of protein identifications. Improved search engines and databases are likely to increase the fidelity of mass spectrometry-based proteomics.

Recent perceptual studies of general deterrence have been guided by an unnecessarily narrow conception of general deterrence, despite the methodological advances in this type of research. These studies, moreover, have failed to recognize the complexity of the perceptual processes that intervene between the threat or experience of legal sanctions and behavioral outcomes. Consequently, the conclusions drawn from the findings about the process of general deterrence are questionable. This paper critically reviews perceptual studies of general deterrence with a view toward expanding the scope of deterrence theory and stimulating research in new directions. Suggestions are made about the kinds of data and analyses needed to test such theory more adequately.

In the present study, quantitative and qualitative data are presented to examine individual and contextual predictors of bullying and victimization and how they vary by age and gender. Two waves of survey data were collected from 2,678 elementary, middle, and high school youth attending 59 schools. In addition, 14 focus groups were conducted with 115 youth who did not participate in the survey. Changes in both bullying and victimization were predicted across gender and age by low self-esteem and negative school climate, with normative beliefs supporting bullying predicting increases in bullying only. Focus group comments provided insights into the dynamics of bullying, highlighting its connection to emergent sexuality and social identity during adolescence. Findings are discussed in terms of their implications for preventive antibullying interventions in schools.