Statistical analyses
Data are presented as numbers and percentage for nominal parameters and as mean and standard deviation for continuous variables. Two groups were compared using Student’s t test for continuous variables and Chi-square or Fisher’s Exact test for categorical variables, each when appropriate. Comparison with data from the literature was compared with Z scores. All tests of hypotheses were considered significant when two-sided probability values were P<0.05. All statistical analyses were performed using IBM, SPSS-25, Armonk, NY, USA.