Statistical analysis
Comparisons of demographic, clinical and chest X-ray imaging as well as
outcomes of admissions were performed with appropriate univariate
analyses. Specifically, nominal variables were compared using Pearson’s
chi-square test, continuous variables that matched parametric criteria
were compared by using Student’s t-test or One-Way ANOVA (analysis of
variance), and ordinal variables and continuous variables that did not
match parametric criteria were compared by using Wilcoxon or
Mann-Whitney U tests. Continuous variables are presented as mean ±
standard deviation (SD). Categorical data are expressed as percentages.
Statistical significance was defined as p-value ≤ 0.05. Analyses were
performed via IBM SPSS software version 22.