Table 2 Characteristics of the infected and non-infected groups (n = 503) seen over the whole study period

 Age (years)

67 ± 9

65 ± 10

0.053

 Sex M/F

374/81

36/12

0.222

 Body mass index (kg/m²)

28 ± 4

28 ± 4

0.954

 Preoperative insulin-like growth factor 1 (mmol/mol)

45 ± 11 (n = 438)

51 ± 17 (n = 46)

0.070

 Diabetes (%)

119/455 (26.5 %)

20/48 (41.7 %)

0.022 (*)

 Preoperative hemoglobin concentrations (g/L)

141 ± 14 (451)

137 ± 11 (n = 47)

0.086

 Preoperative serum creatinine concentrations (μg/L)

86 ± 28 (n = 452)

85 ± 23 (n = 47)

0.597

 Corticoid steroid treatment (%)

12/455 (2.6 %)

2/48 (4.2 %)

0.540

 Current smoking no/smoked the last 2 months/never smoked

54/314/87

7/36/5

0.319

 Chronic Obstructive Pulmonary Disease (%)

12/455 (2.6 %)

1/48 (2.1 %)

0.818

 Ejection fraction (%)

48 ± 9 (n = 348)

49 ± 10 (n = 35)

0.272

 Number of saphenous vein grafts (n)

3 ± 1 (n = 424)

3 ± 1

0.693

 Internal mammary artery 0/1/2

41/412/2

2/46/0

0.621

 Duration of cardiopulmonary by-pass time (min)

85 ± 29 (n = 453)

85 ± 27

0.683

 Duration of aortic cross clamp time (min)

47 ± 19 (n = 453)

49 ± 19

0.634

 Erythrocyte transfusion day 0 (%)

135/455 (29.7 %)

19/48 (39.6 %)

0.156

 Erythrocyte transfusion day 1 (%)

71/455 (15.6 %)

10/48 (20.1 %)

0.349

 Erythrocyte transfusion day 2 (%)

65/455 (14.3 %)

14/48 (29.2 %)

0.007 (**)

 Mean blood glucose concentration day 0 (mmol/L)

7.8 ± 1.3 (n = 453)

7.5 ± 1.0

0.295

 Mean blood glucose concentration day 1 (mmol/L)

8.2 ± 1.6 (n = 453)

8.5 ± 1.8

0.213

 Mean blood glucose concentration day 2 (mmol/L)

9.0 ± 2.2 (n = 380)

9.4 ± 3.0 (n = 46)

0.788