Statistics
FO2 insp. and FO2 pre-insp. measurements
are expressed as mean and SD. ANOVA was performed with a post-hoc
Tukey’s test to analyse between-group differences. In addition, to test
the predictive factors associated with FO2 insp. and
FO2 pre-insp., multiple regression analyses were
performed to determine whether VT, f and oxygen flow
rate were significant predictors. Statistical analyses were performed
using SPSS 17.0 software (SPSS Inc., Chicago, IL). A p value of
<0.05 was considered statistically significant.