(3) The second study by Seung Hyeok Han adjusted the following variables: age, sex, CCI score, septic AKI, MAP, eGFR, SOFA score, WBC, Alb and CRRT dose, but did not adjust for the following variables: myocardial infarction, diabetes, congestive heart failure and hypertension, CRP, AKI cause, mechanical ventilation and phosphate which had been reported to occur in critically ill patients [13–17]. Here, CRP is linked to congestive heart failure.