IL6 and obesity due to melanocortin 4 receptor deficiency: To explain which of the risk factors had an impact on pneumonia severity, a multiple regression model was set with 10 variables in Block 1, of which seven predictors were obtained (p < 0.001), of which three occured significant: IL-6, CRP, obesity (p < 0.05) and two variables were close to significance: D-dimer and lymphocyte levels (p = 0.074, p = 0.073).