Descriptive analysis
We performed statistical analysis using Stata v17.0 (Stata Corp.,
College Station, Texas, USA). We explore the distribution of variables
using analytical and graphical methods and report numerical data.
Numerical variables are expressed as mean and standard deviation or as
median and interquartile range (IQR), while categorical variables are
expressed in absolute and relative frequencies. For mortality and
complications, we estimate the cumulative incidence in the perioperative
period and follow up.