Search for: [Abstract = "COVID\-19. 4.8. Statistical analysis The statistical analysis was performed using SPSS ver. 27 software \(Armonk, NY, USA\). Results were presented based on the parameters of descriptive statistics, including the mean values and standard deviations \(SD\) for the quantitative variables with a normal distribution or median values with the interquartile range for non\-normally distributed data. Categorical variables were presented as numbers with percentages. Qualitative values were compared by the chi\-square test. The Kruskal–Wallis test was used for the analysis of the continuous variables investigated in the study. In all cases of statistical significance, a pairwise comparison between the groups was performed using a post\-hoc test. In all analyses, a p\-value < 0.05 was considered statistically significant. 4.9. Ethics The study was performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments. It was approved by the Ethics Committee of the Regional Medical Chamber in Krakow No OIL\/KBL\/18\/2020 on 10 March 2020. 4.10. Summary of the results 4.10.1. Article No 1 published in Journal of Clinical Medicine In the study, results of data analysis of the COVID\-19 course in the first five waves of the pandemic, obtained from 1407 patients who met the inclusion criteria, were presented. The demographic characte"]

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