CD4 and chronic kidney disease: Among immunocompromised patients, the univariate analysis showed that 11 variables were significantly associated with ICU mortality, including age, SOFA score, lymphocyte count, platelet count, D-dimer level, fibrinogen level, PaO2/FiO2, FiO2 group, lactate level, CD4 cell count, and chronic kidney disease (Table 3, Supplementary Table S4).