Table 2 Patient characteristics

n

117

67

Age (median [IQR]) years

74 [69, 78]

75 [70, 80]

0.576

Sex, n (%) male

86 (73)

48 (71)

0.919

BMI (median [IQR]) kg m⁻²

26 [24, 30]

25 [24, 29]

0.333

American Society of Anaesthesiologists classification

0.333

 2

27 (23)

11 (16)

 3

88 (75)

53 (79)

 4

2 (1)

3 (4)

Surgical procedure

 Open aortic surgery

13 (11)

11 (16)

0.423

 Peripheral vascular surgery

58 (50)

40 (60)

0.241

 Endovascular aortic surgery

46 (39)

16 (24)

0.049

Anaesthesia technique

 General anaesthesia

40 (34)

31 (46)

0.144

 Regional anaesthesia

79 (67)

39 (58)

0.268

Intra-operative haemorrhage > 500 ml

24 (20)

21 (31)

0.143

Comorbidities

 Smoker

38 (32)

25 (37)

0.615

 Hypertension

101 (86)

57 (85)

0.989

 Diabetes, no insulin therapy

26 (22)

14 (20)

0.957

 Diabetes, with insulin therapy

14 (12)

11 (16)

0.547

 Chronic obstructive pulmonary disease

20 (17)

10 (14)

0.841

 Heart failure

19 (16)

14 (20)

0.571

 Ischemic heart disease

44 (37)

21 (31)

0.461

 Stroke or TIA

10 (8)

10 (14)

0.284

 Cancer

11 (9)

10 (14)

0.383

 Chronic kidney disease

21 (18)

8 (11)

0.374

Biomarker, pre-operative

 Creatinine (median [IQR]) μmol l^-1

85 [72, 101]

82 [68, 98]

0.298

 NT-proBNP (median [IQR]) ng l^-1

219 [97, 537]

231 [121, 539]

0.440

 hs-cTnT (median [IQR]) ng l^-1

13 [9, 18]

13 [10, 18]

0.584

Duration of surgery (median [IQR]) minutes

155 [118, 231]

230 [163, 299]

<0.001

Group hyperoxia^a

61 (52)

29 (43)

0.316