Statistical analysis
Demographic and clinical characteristics of patients with COVID-19 were
analyzed using descriptive statistics. The Mann-Whitney U test and
Student t-test were used to determine significant differences between
continuous variables, as appropriate. The adjusted Chi-square test was
used to determine significant differences between categorical variables.
Statistical significance was set at two-sided P-values ≤ 0.05. All
analyses were performed with Statistical Product and Service Solutions
(SPSS) version 21 (IBM Corp, Armonk, NY).