Table 2. Comparison of patient characteristics according to mortality.

	No mortality (n=84)					Mortality (n=32)					p
	n	%	Mean±SD	Median	IQR	n	%	Mean±SD	Median	IQR
Age (year)				82.4±2.5				84.1±4.1			0.030
Sex
Female	30	35.7				13	40.6				0.625
Body mass index (kg/m2)			28.3±4.6					29.4±4.5			0.351
Body mass index (n=95)											0.836
Normal	24	32.0				5	25.0
Overweight	25	33.3				5	25.0
Obese class I	17	22.7				7	35.0
Obese class II	9	12.0				3	15.0
Operation											0.006
Elective	70	94.6				19	59.4
Urgent	14	16.7				13	40.6
Operation type											0.023
CABG	53	63.1				12	37.5
Mitral valve surgery	14	16.7				6	18.8
Aortic valve surgery	4	4.8				6	18.8
Aortic valve surgery + CABG	11	13.1				5	15.7
Mitral valve surgery + CABG	2	2.4				3	9.4
Diabetes mellitus	33	39.3				21	65.7				0.011
Hypertension	34	40.5				18	56.3				0.127
Preoperative pulmonary artery pressure			30.0±12.3					33.4±15.0			0.209
Pulmonary hypertension											0.070
Normal	49	58.3				19	59.4
Moderate	33	39.3				9	28.1
Severe	2	2.4				4	12.5
Cardiopulmonary bypass time			115.7±35.8					126.2±40.9			0.176
Aortic cross clamp time				81	58-118				85	75-126	0.172
Creatinine clearance			65.3±15.4					54.4±20.9			0.010
Preoperative ejection fraction			52.3±9.5					49.3±10.0			0.152
Preoperative ejection fraction (n=110)											0.396
Normal	50	59.5				13	46.4
Moderate	27	32.1				13	46.4
Low	5	59.5				2	6.3
Peripheral arterial disease	2	2.4				0	0				0.999
History of stroke	3	3.6				0	0				0. 565
Postoperative stroke	4	4.8				3	9.4				0.377
Postoperative renal failure	4	4.8				12	37.5				<0.001
Postoperative infection	5	6.0				7	21.9				0.013
Reoperation	13	15.5				17	53.1				<0.001
Mechanical ventilation time (days)	1	1.1				2	1.5				<0.001
Length of stay in the intensive care	1	1.2				2	1.5				0.006
Total length of stay				7.5	7-12				4	1-10.5	<0.001
SD: Standard deviation; IQR: Interquartile range; CABG: Coronary artery bypass grafting.