Table 1 Baseline patient characteristics. Data presented as mean (standard deviation) or number and absolute percentages

Sex; M:F

26:74

32:68

0.350

Age; years (SD, range)

68.1 (9.7, 46–94)

67.2 (10.9, 13–88)

0.547

Weight; kg (SD, range)

81.6 (17.8, 46–130)

83 (18.5, 50–137)

0.566

Body mass index; kg m⁻²

31.7 (6.4)

31.4 (6.7)

0.757

American Society Anesthesiology Status

 1

4

3

 2

56

73

0.971

 3

39

23

 4

1

1

Comorbidities

 Cardiac disease

18

17

0.852

 Hypertension

65

62

0.660

 Diabetes mellitus

22

16

0.280

 Peripheral vascular disease

4

2

0.407

 Cerebrovascular disease

6

1

0.054

 Pulmonary embolus

1

0

0.316

 Deep venous thrombosis

4

7

0.352

 Renal impairment

5

11

0.118

 Active smoker

10

5

0.180

 Previous smoker

33

39

0.377

 Chronic obstructive airways disease

20

21

0.861

 Other

71

78

0.256

Preoperative medications

 Aspirin

17

17

1.000

 Clopidogrel

1

0

0.316

 Warfarin

0

0

1.000

 Non steroidal anti-inflammatory drugs

28

19

0.133