Statistical analyses
Descriptive statistics were reported as frequencies and percentages or as median (interquartile range). Statistical analyses were conducted to compare children with and without corticosteroids: continuous variables were compared using Student t test if normally distributed (as attested by the Shapiro-Wilk test) or Wilcoxon test if not, and the chi-square statistic was used for categorical variables. Results were considered statistically significant when the p value was less than 0.05.