Statistical methods
Statistical analyses were performed with the Statistical Package for the
Social Sciences for Windows (SPSS version 24.0; IBM Corp, Armonk, NY,
USA). Depending on the outcomes and distribution, the following tests
were used to compare outcomes between two groups of patients (patients
with a history of <2-week tracheostomy and those with a
>2-week tracheostomy): Chi-square and Mann-Whitney U Test.
The relationship between patient epidemiological and clinical features
was investigated with Spearman analysis and multivariate analysis. A
level of significance of p<0.05 was used.