2.6. Statistical analysis
Data were collected prospectively. Categorical variables were tabulated
as numbers with percentages. Continuous variables were shown as median
values, with corresponding IQR. Analysis of the normal distribution of
data (Kolmogorov-Smirnov test) was performed and, according to the
results, appropriate non-parametric statistical analysis was performed.
Differences among continuous variables were analysed using t-test and
Mann-Whitney U test. Differences in categorical variables were analysed
using Fisher’s exact test. Difference between the groups was considered
significant at the level of 0.05. Statistical analysis was performed
using the licensed software IBM SPSS Statistica (version 25.0.
www.statsoft.com, StatSoft, Inc. 2017).