Cost-effectiveness analysis
Incremental cost-effectiveness ratio (ICER) was used.
\begin{equation} ICER=\frac{cost\ Day\ Case\ Tonsillectomy-cost\ inpatient}{Effectiveness\ DayCase\ Tonsillectomy-Effectiveness\ inpatient}\nonumber \\ \end{equation}
Data analysis was performed using Tree Age and Excel 2016 software. Besides, chi-square and independent t-tests (p <0.05) were used for data analysis.