Table 1.

Baseline characteristics

Characteristic	Total	Medical group	Surgical group	p-value
No. of patients	7,150 (100)	3,625 (50.7)	3,525 (49.3)
Age (yr)	63.88 ± 13.38	63.93 ± 13.91	63.83 ± 12.82	0.32
Male sex	4,289 (60.0)	2,191 (60.4)	2,098 (59.5)	0.43
Comorbidities
Diabetes mellitus	3,265 (45.7)	1,908 (52.6)	1,360 (38.6)	<0.001
Hypertension	4,791 (67.0)	2,730 (75.3)	2,062 (58.5)	<0.001
Chronic kidney disease	1,464 (20.5)	1,004 (27.7)	461 (13.1)	<0.001
Ischemic heart disease	1,098 (15.4)	637 (17.6)	462 (13.1)	<0.001
Lung disease	349 (4.9)	235 (6.5)	115 (3.3)	<0.001
Liver disease	696 (9.7)	381 (10.5)	314 (8.9)	0.02
Stroke	729 (10.2)	396 (10.9)	333 (9.4)	0.04
Malignancy	3,088 (43.2)	1,375 (37.9)	1,715 (48.7)	<0.001
Severity of disease at ICU admission
SOFA score	5.77 ± 3.75	6.61 ± 3.93	4.91 ± 3.34	<0.001
Sepsis	2,440 (34.1)	1,586 (43.8)	856 (24.3)	<0.001
Incidence of AKI	2,461 (34.4)	1,765 (48.7)	694 (19.7)	<0.001

Data are expressed as number (%) or mean ± standard deviation.

AKI, acute kidney injury; ICU, intensive care unit; SOFA, Sequential Organ Failure Assessment.