Statistical analysis
For data analysis, the Statistical Package for Social Sciences (SPSS)
version 20.0 was used. Normality was analyzed using the Shapiro-Wilks
test. Categorical variables were verified using the Chi-square.
Continuous data were expressed as mean and standard deviation. To assess
the oxygenation, functional and length of stay, intra and intergroup,
the paired Student’s t-test and the independent test were used,
respectively. The variables pulmonary complications and mortality were
assessed using the Chi-square. A p <0.05 was considered
significant.