Statistical analysis
SPSS.19 and R softwares statistical analysis was performed using the R
Software. The measurement data were statistically described by mean ±
standard deviation and performed by t test. Count
data was described by frequency, and
the chi-square test or Fisher’s exact test was used for the comparison
between groups. Multivariable analyses to identify factors associated
with death from COVID-19 patients were performed by cox proportional
hazards regression model. P<0.05 was considered statistically
significant.