The three groups demonstrated consistency in various baseline characteristics, including gender, age, transplantation vintage (Interval time between kidney transplantation and onset of COVID-19 pneumonia), hypertension, diabetes, coronary heart disease, BMI, CT score, baseline creatinine, WBC at admission, lymphocyte counts on admission, albumin on admission, CRP, and PCT at admission, with no statistically significant differences observed, as shown in Table 2. Here, ALB is linked to Hypertension.