CALCA and infection: In the multivariate logistic regression analysis including log-transformed PCT levels along with age, gender, baseline eGFR, and SOFA score at ICU admission for adjustment, we demonstrated that the serum PCT level behaved as an independent factor for predicting AKI in the whole cohort (OR = 1.27, 95% CI = 1.12–1.43), including the non-infection patients (OR = 1.38, 95% CI = 1.12–1.71, p = 0.003) and the infection group (OR = 1.23, 95% CI = 1.03–1.46, p = 0.020).