A multivariate regression analysis was performed in the two cohorts separately (Tables 4, 5), considering survival as independent variable; dependent variables were duration of symptoms before hospitalization, duration of hospitalization, age, gender, respiratory parameters (mainly FiO2 at admission in the Internal Medicine ward), bio-humoral parameters (haemoglobin, lymphocytes, creatinine, CRP), comorbidities (heart disease, hypertension, diabetes, chronic obstructive pulmonary disease—COPD, active or previous smoke). This evidence concerns the gene CRP and chronic obstructive pulmonary disease.