Statistical analysis
All
analyses were conducted with IBM SPSS Statistics, version 19.0 (SPSS
Institute, Chicago IL, USA). Categorical variables were conducted by the
chi-square (χ2) and Fisher’s exact tests. Normally distributed variables
were compared using the Student’s t-test, whereas non-normally
distributed variables were conducted by the Kruskal-Wallis test.
Two-sided P values of 0.05 were
considered statistically significant. The time to oxygen-support
requirement, virus clearance were portrayed by Kaplan–Meier plot.
Associations between therapies and these outcomes were assessed by Cox
proportional hazards regression.