Table 2: Bivariate analysis between the ICU-LOS and independent variables.

ICU-LOS (days) 𝑃 -value
≤2>2
𝑛 (%) 𝑛 (%)

Gender0.48*
 Male51 (50.0)51 (50.0)
 Female27 (56.3)21 (43.8)
Age (years)0.89*
 ≤6641 (52.6)37 (47.4)
 >6637 (51.4)35 (48.6)
BMI0.22*
 Normal29 (59.2)20 (40.8)
 Overweight/obese49 (48.5)52 (51.5)
Chronic pulmonary disease0.2*
 No67 (54.5)56 (45.5)
 Yes11 (40.7)16 (59.3)
Diabetes0.6*
 No54 (53.5)47 (46.5)
 Yes24 (49.0)25 (51.0)
Type of surgery0.06*
 Coronary artery bypass grafting (Type I)40 (59.7)27 (40.3)
 Valve disease repair (Type II)23 (56.1)18 (43.9)
 Aorta aneurysm repair6 (35.3)11 (64.7)
 Types I and II5 (27.8)13 (72.2)
 Other***4 (57.1)3 (42.9)
Preoperative serum Cr (mg/dL) 𝟎 . 𝟎 𝟎 𝟓
 ≤1.471 (57.3)53 (42.7)
 >1.47 (26.9)19 (73.1)
Mean intraoperative blood glucose (mg/dl) 𝟎 . 𝟎 𝟎 𝟐
 ≤13050 (64.1)28 (35.9)
 >13028 (38.9)44 (61.1)
Preoperative IABP 0 . 0 5
 No78 (53.4)68 (46.6)
 Yes0 (0.0)4 (100.0)
CPB0.72*
 No9 (56.3)7 (43.8)
 Yes69 (51.5)65 (48.5)
EFLV0.1*
 ≤5550 (47.6)55 (52.4)
 >5528 (62.2)17 (37.8)
Duration of surgery (min) 𝟎 . 𝟎 𝟎 𝟐
 ≤25049 (64.5)27 (35.5)
 >25029 (39.2)45 (60.8)
Duration of CPB (min)< 𝟎 . 𝟎 𝟎 𝟏
 ≤12551 (67.1)25 (32.9)
 >12527 (36.5)47 (63.5)
Preoperative AF 𝟎 . 𝟎 𝟎 𝟑
 No75 (56.4)58 (43.6)
 Yes3 (17.6)14 (82.4)
Emergency 𝟎 . 𝟎 𝟎 𝟐
 No76 (56.3)59 (43.7)
 Yes2 (13.3)13 (86.7)
Ischemic time (min)0.073*
 ≤7845 (59.2)31 (40.8)
 >7833 (44.6)41 (55.4)
RBC 𝟎 . 𝟎 𝟏 𝟔
 No57 (59.4)39 (40.6)
 Yes21 (38.9)33 (61.1)
Logistic EuroSCORE (%)< 𝟎 . 𝟎 𝟎 𝟏
 ≤5.452 (69.3)23 (30.7)
 >5.426 (34.7)49 (65.3)

AF: atrial fibrillation, BMI: body mass index, CPB: cardiopulmonary bypass, Cr: creatinine, EFLV: ejection fraction of the left ventricle, EuroSCORE: European system for cardiac operative risk Evaluation, IABP: intraaortic balloon pump, ICU: intensive care unit, LOS: length of stay, RBCs: red blood cells.
*Chi-square test
**Fisher’s exact test
***Another category refers to 7 patients who have undergone the closure of an atrial septal defect or a valve surgery in conjunction with aorta aneurysm repair.