Data abstraction and analysis
Infants’ characteristics and information were collected from the
electronic medical records. Gross findings of the AE tract and
associated complications were obtained from the FE reports. Airway
malacia was diagnosed when there was greater or equal to 50% reduction
in the luminal diameter during spontaneous breathing. Categorical
variables are reported as frequency and percentage, while continuous
variables are reported with median and interquartile range. All data
analyses were performed using Stata 13.1 software.