Statistical Analysis
Statistical analyses were performed using the IBM Statistical Package for the Social Sciences (SPSS) for Windows 23.0 (IBM Corp., Armonk, NY). Continuous values are given as mean ± standard deviation (SD), or as median (range) according to the homogeneity of the distribution, which was evaluated using the Kolmogorov-Smirnov test. Categorical data are presented as numbers (n) and frequencies (%) and were analyzed by the χ2 test. The “Intraclass Correlation Test” was used to evaluate the concordance between rib counts measured by CXR and POCUS. A p-value of < 0.05 was considered statistically significant.