CST3 and acute kidney injury: Laboratory results, such as baseline Scr levels (P < 0.001), Scr on ICU admission levels (P < 0.001), Scr at the time of AKI diagnosis levels (P < 0.001), peak Scr levels (P < 0.001), BUN levels (P < 0.001), uric acid levels (P < 0.001), calcium levels (P = 0.038), cystatin C levels (P < 0.001), platelets levels (P < 0.001), lactate levels (P = 0.001), and oxygenation index levels (P < 0.011) on ICU admission differed significantly between the three groups.