We identified the following variables as most relevant (in decreasing order): saturation values (spO2 in free air and paO2.PF), white blood cell counts, lymphocyte counts, the number of comorbidities, C-reactive protein, diabetes, cardiovascular pathologies, age, haemoglobin, neoplasia in the past 5 years, the opacity score computed on CXR by the deep network, nausea, the extent of COVID-19 pattern computed on CXR by the deep network (OPC.extent.score and GEO.extent.score), the red blood cell count, usa.radio.score, dyspnea, radio.score, respiratory failure (IR), and haematocrit. Here, CRP is linked to COVID-19.