Statistical Analysis:
SPSS v.24 (SPSS, Chicago, IL, USA) was used to perform the statistical
analysis. Data presented as median with interquartile range or
frequencies. Comparisons between groups analyzed by Mann– Whitney
U-test; p < 0.05 considered significant. Pearson
correlation was used to correlate between SpO2 and other variables,
correlation was considered significant if r >0.5.
GraphPad was used to instruct the correlation graph.