The radiographic and laboratory findings (Table S2), and low levels of lymphocytes and albumin were observed in the severe/critical group (P = 0.001 and P = 0.014, respectively), and higher rates of lymphopenia and hypoproteinemia were noted in the severe/critical group (31.0% vs. 10.1%, P = 0.002; 62.1% vs. 37.3%, P = 0.013, respectively). Here, ALB is linked to lymphopenia.