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Table 1 Patient characteristics, according to postoperative diagnosis of delirium

From: Sleep-disordered breathing is a risk factor for delirium after cardiac surgery: a prospective cohort study

  All patients (n = 92) No postoperative delirium (n = 48) Postoperative delirium (n = 44) P
Male, n (%) 66 (60.6) 35 (72.9) 31 (70.4) 0.082
Body mass index (BMI) 27.1 ± 3.9 27.1 ± 3.3 27.2 ± 4.5 0.91
Mean age, (years) 67.5 ± 8.9 64.5 ± 9 70.8 ± 7.8 0.001
Alcohol abuse, n (%) 10 (10.9) 3 (6.2) 7 (15.9) 0.14
Smoking, n (%) 23 (25) 7 (14.6) 16 (36.3) 0.016
Diabetes, n (%) 21 (22.8) 10 (20.8) 11 (25) 0.63
Arterial hypertension, n (%) 89 (96.7) 46 (95.8) 43 (97.7) 0.34
Chronic obstructive lung disease, n (%) 20 (21.7) 7 (14.6) 13 (29.5) 0.09
Renal insufficiency, n (%) 13 (14.1) 5 (10.4) 8 (18.2) 0.25
Impaired left ventricular function, EF n (%): normal (≥55%) 58 (63) 30 (62.5) 28 (65.1) 0.7
Mild (45-54%) 16 (17.4) 10 (20.8) 5 (11.6)  
Moderate (36-44%) 8 (8.7) 3 (6.3) 4 (9.3)  
Severe (≤35%) 11 (12.5) 5 (10.4) 6 (14)  
History of stroke, n (%) 7 (7.6) 3 (6.3) 4 (9.1) 0.48
Atrial fibrillation preoperative, n (%) 13 (14.1) 6 (12.5) 7 (16.7) 0.22
Long-term glucocorticoid medication, n (%) 5 (5.4) 0 (0.0) 5 (11.4) 0.056
Albumin g/l 43.5 ± 3.4 44.4 ± 3.1 42.3 ± 3.4 0.003
Hemoglobin g/dl 13.2 ± 1.6 13.7 ± 1.5 12.7 ± 1.6 0.005
Urea mg/dl 37.9 ± 19.0 36.1 ± 13.9 40.2 ± 23.5 0.33
Mean number of transfused packs of RBC 3.0 ± 2.3 2.2 ± 1.8 3.8 ± 2.6 0.001
Type of heart surgery (CABG/open heart surgery ± CABG) 47/45 26/22 21/23 0.54
Mean extracorporeal circulation time (min.) 112 ± 41.5 108 ± 41.4 115 ± 42 0.37
Postoperative intubation time (hrs) median (IQR [range]) 13 (10-18 [4-91]) 11 (9-14 [5-29]) 18 (14-23[4-91]) <0.001
Time (days) spent in intensive and intermediate care unit, median (IQR [range]) 5 (3-6 [2-17]) 4 (3-5 [2-15]) 6 (5-8 [2-17]) <0.001
Time (hrs) spent in intensive care unit, median (IQR [range]) 23 (20-47 [11-289]) 21 (19-24 [12-77]) 46 (23-78[11-289]) <0.001
Benzodiazepine intake during the night of the sleep study (yes/no) 22 (25.6) 12 (27.9) 10 (25.6) 0.82
  1. (EF, ejection fraction; RBC, red blood cell; CABG, coronary artery bypass grafting; IQR, interquartile range; data in cells represent absolute values or mean ± standard deviation).