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ISKOLÁSKORÚ GYERMEKEK EGÉSZSÉGMAGATARTÁSA age group). Besides the internationally mandatory item package, several international optional and country specific guestions were included. Data collection The survey was performed with ethical approval of the Hungarian Medical Scientific Council. Data collection was conducted in the classrooms, using anonymous online self-reported guestionnaires, and under the control of trained personnel. The survey was performed in 331 classes of 193 schools in AprilJune 2022. The data file, analysis, presentation and interpretation of the results Weighting was used to increase the validity of estimations. To correct for the bias caused by the differences between the population and sample distribution of certain socio-demographic characteristics, post-stratification weights have been created. Grade, geographical region, settlement size, school maintainer, and school type were used as post-stratification variables separately in each grade. Data analyses were performed using IBM SPSS 28.0 software. Descriptive results are presented in gender and grade breakdown. Gender and grade differences were tested by using bivariate analyses (Chi-square tests, independent sample t tests and ANOVAs). Trend analyses between 2002 and 2022 were done for several variables using previous HBSC data files (95% confidence interval testing). Reliability of scales was tested by calculating Cronbach-alphas.
