Introduction: Asthma is a common chronic respiratory disease caused by inflammation of the airways and smooth muscle contractions. Reducing exposure to environmental risk factors remains key despite advances in managing asthma exacerbations. Aim: The aim of this master thesis is to assess the association between the prevalence of asthma and asthma-like symptoms and observed environmental risk factors in children and adolescents in a convenience sample of selected primary schools in Slovenia. We developed three objectives: (1) to estimate the prevalence of asthma and asthma-like symptoms in children and adolescents in the convenience sample, (2) to estimate the prevalence of environmental risk factors, and (3) to estimate the association between the prevalence of asthma symptoms and observed environmental risk factors. Methods: We included data collected from 1 September 2023 to 31 May 2024. The convenience sample consists of 561 children (6-7 years) and adolescents (12-13 years) from 11 primary schools. The data was collected via a questionnaire and analysed using IBM SPSS Statistics. We described the results in terms of two observed outcomes with 29 explanatory and 6 confounding factors. Results: Asthma and asthma-like symptoms occurred at least once in the lifetime of 35.6 % of children and adolescents, while 19,1 % experienced symptoms in the last 12 months. A diagnosis of asthma was reported in 2.5 % of children and adolescents. Discussion and conclusion: In this convenience sample, we estimate that the occurrence of asthma and asthma-like symptoms at any point in life is influenced by prenatal exposure to tobacco smoke, the presence of mould in the home in the last 12 months, the presence of mould in the child's room, and the use of glues, thinners and other chemicals in the presence of the child. In the last 12 months, asthma and asthma-like symptoms were associated with living near an industrial plant, maternal smoking during pregnancy, current exposure to tobacco smoke in the home and the regular contact with farm animals during the first year of life. The influence of certain confounding factors is also important, including a year-round blocked nose, genetic predisposition and the mother's education level.
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