Table 3.

Postoperative characteristics of the patients

Variables	All patients (n = 383)	Non-AKI (n = 232)	AKI (n = 151)	P value
APACHE II score	18(13,22)	16(12,21)	20(16,25)	<  0.0001
Serum Cr, mg/dl	0.96(0.74,1.37)	0.85(0.69,1.09)	1.28(0.89,1.86)	<  0.0001
Hemoglobin, g/L	110.0(95.0,121.6)	112.7(97.0,122.7)	107.0(89.0,121.0)	0.086
Lactic acid,mmol/L	1.5(0.9,2.4)	1.2(0.8,2.1)	1.8(1.1,3.3)	<  0.0001
UP, ml/kg/h	1.79(1.17,2.41)	1.85(1.24,2.45)	1.58(1.04,2.38)	0.033
Postoperative reoperation, n (%)	97(25.3)	52(22.4)	45(29.8)	0.048

Continuous variables were expressed as mean ± SD or median (25th percentile–75th percentile, IQR). Categorical variables were expressed as a number (%). Postoperative reoperation, need for the second emergency operation within 7 days after the first emergency procedure

Abbreviations: AKI Acute Kidney Injury, APACHE II Acute Physiology and Chronic Health Evaluation II, Cr Creatinine, IQR Interquartile Range, UP Urine Output Within The First 24 Hours After Operation, SD Standard Deviation