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The present study aimed to develop the General Conspiracy Belief Scale (ECGC), seeking evidence of its factorial validity and internal consistency. For this, two studies were carried out. In Study 1 (n=229) an analysis of the main components identified a five factor structure, each composed of three items: pharmaceutical manipulation (a=.74), global conspiracies (a=.80), manipulation by secret groups (a=.80), extraterrestrial contact cover ups (a=.92) and information control (a=.60). In Study 2 (n=229) the confirmatory factor analysis indicated that the bifactor model best fitted the data (CFI=.96, TLI=.94, RMSEA=.06). The final version of the ECGC, composed of 15 items, presents adequate psychometric evidence to evaluate beliefs in conspiracy theories, which can be used in research in the Brazilian context. [ABSTRACT FROM AUTHOR]

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