Statistical analysis
BROWN
The primary endpoint was analyzed using one-way ANOVA and expressed using mean (SD), after ensuring the normal distribution with a D’Agostino-Pearson omnibus normality test. We used Kaplan–Meier curves to illustrate the length of stay with greater SpO2 than 92% for both groups. We performed a log-rank (Mantel-Cox) test to compare them. Secondary endpoints were analyzed using one-way ANOVA to compare groups. The univariate normality assumption was verified with the Shapiro–Wilk tests on the error distribution from the statistical model. Brown and Forsythe's variation of Levene's test statistic was used to verify the homogeneity of variances. Time for SpOWe calculated our sample size using data from a previous study [