The only exception was that the higher PCT levels of the infection (−)/AKI (+) group compared to the infection (−)/AKI (−) group was not statistically significant (p = 0.059), and this insignificancy might be related to some unidentified bias that occurred in the range of eGFR 30–50 mL/min/1.73 m2. Here, CALCA is linked to infection.