Fig. 4.

Correlation between laboratory findings and immunophenotyping data.

In red are reported severe COVID-19 subjects, in yellow non-severe COVID-19 subjects. PMN/T: PMN cell percentage/T cell percentage, P/F: PaO₂/FiO_2. Correlation was performed using Spearman test (Spearman coefficient [ρ] and statistical significance [p] are reported in the graphics). Linear correlation was evaluated by using the regression test, for A) R² = 0.311, p < 0.0001, for B) R² = 0.2411, p = 0.0006, for C) R² = 0.1083, p = 0.0273. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)