2.3 Data analysis
Datas were processed using SPSS 26.0. Continuous variables were expressed as mean ± standard deviation (SD) or median values (interquartile range) and assessed by independent group t tests or Mann-Whitney U test. Categorical variables were expressed as percentage (%) and assessed by Chi-squared tests or Fisher’s exact test. Receiver Operating Characteristic (ROC) curves and Logistic regression analysis were performed to identify variables associated with multiple FOB therapy in PB patients. A two-sided α less than 0.05 were considered as statistically significant.