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BACKGROUND: Adolescence is one of the most important stages in a human life. This period is full of different stimuli and types of influence - from parents, peers, and society. It is related to greater susceptibility to problematic behaviour and to impulsivity. Because of that it is important to explore the topic of impulsivity and impulsive behaviour. METHODS: This study addresses impulsivity in adolescents using a Czech questionnaire survey method, the Scale of Impulsivity Dolejs & Skopal (SIDS). It also empirically verifies the functionality of the scale and points out its psychometric qualities. The research involved 13,676 adolescent participants aged 11-19. The sample consisted of schoolchildren attending years 6-9 (ISCED 2) of what is called in Czech 'basic school' a term that will be used throughout the text and students of general and specialized secondary schools (ISCED 3). RESULTS: The SIDS questionnaire data collected was subsequently subjected to statistical processing. We used Item Response Theory analysis, which depicted items that did not function correctly, and method revision was suggested. Confirmatory factor analysis demonstrated that the shorter version has a good factor structure and reliability. The raw score differences between age, sex, and schools were assessed with linear models. CONCLUSION: This research can help to understand the importance of research in the field of impulsivity. It introduces the new shorter version of the questionnaire of the Scale of Impulsivity Dolejs & Skopal (SIDS). A better understanding of this topic can help with the prevention of impulsive behaviour. [ABSTRACT FROM AUTHOR]

INTRODUCTION: The Czech Republic records one of the highest prevalence levels of obesity in comparison to other European and world countries. The present study aims to fill a gap in the use of tools in research of food addiction (FA), which is believed to be one factor in the high prevalence of obesity. METHODS: A pen-and-paper study was conducted using a nationally representative non-clinical sample of 3950 adolescents aged 11-19. RESULTS: The FA prevalence rate was 4.1%. Exploratory and confirmatory factor analyses verified a one-factor structure. The reliability corresponded to KR = 0.80, CI95% = (0.79, 0.81), McDonald's? = 0.79 (0.86 for continuous scale). The connection between FA and impulsivity was confirmed using Poisson regression and logistic regression, and the prevalence of FA decreases with lower impulsivity. CONCLUSIONS: The study findings suggest that the Czech version of mYFAS 2.0 is a reliable tool for research purposes with regard to the Czech environment. Further research should incorporate additional personality traits to obtain a more comprehensive understanding of the emerging topic of food addiction. [ABSTRACT FROM AUTHOR]