Data analysis
REGRESSION
All statistical analyses were performed using SPSS for Windows version 26 (IBM Corp., Armonk, NY, USA). Categorical variables were described as frequencies (percentages) and analysed with two-tailed Fisher’s exact tests. Continuous variables were analysed with two-sample exact Mann–Whitney–Wilcoxon rank sum tests. P-values <0.05 were considered statistically significant. All risk factors found to be significant in univariate analyses were included in multivariate logistic regression analysis.