Statistical analysis
The data were analyzed using IBM SPSS Statistics for Windows version
20.0 (IBM Corp., Armonk, NY). Pearson’s chi-square test and
Mann–Whitney U test were used for intergroup comparisons of parametric
data and nonnormally distributed numerical data, respectively.
Independent-samples t test was used to compare demographic data and
laboratory parameters between the groups. Wilcoxon analysis was used for
intragroup comparisons of laboratory values during follow-up. Pearson
correlation analysis was used to evaluate relationships between MCP-1
and SP-A levels and CRP, prothrombin time, D-dimer and PaO2/FiO2. A
p-value less than 0.05 was considered statistically significant.