Statistical Analysis
Data were tested for normality using the Kolmogorov-Smirnov test and
expressed as the mean (standard deviation) or median (interquartile
range), as appropriate. Receiver operating characteristic (ROC) analysis
was used to evaluate the accuracy of the LUS to predict all kinds of
respiratory support needs (comprehensively and separately). Areas under
the curves (AUCs) and cutoff values showing the highest sensitivity were
reported. The AUCs were compared using the method by Hanley and
McNeil26, and p< .05 was considered
statistically significant. Analyses were performed using SPSS version
15.0 (SPSS Inc.) and MedCalc version 13.3 (MedCalc bvba) statistical
software.