Table 2 Baseline demographic and clinical characteristics of each group

ASA (I/II/III)

8/28/4

11/27/2

0.309

Gender (male/female)

24/16

24/16

1.000

Age (years)

60 ± 1

60 ± 2

0.972

Height (cm)

163 ± 1.3

166 ± 1.1

0.049

Weight (kg)

63 ± 1.5

64 ± 1.5

0.490

BMI (kg/m²)

23.6 ± 0.47

23.4 ± 0.42

0.728

Total bilirubin (umol/L)

11.73 ± 0.68

13.75 ± 0.74

0.049

Direct bilirubin (umol/L)

2.28 ± 0.14

2.19 ± 0.13

0.665

Total protein (g/L)

67.85 ± 0.84

67.68 ± 0.74

0.876

Albumin (g/L)

39.2 ± 0.5

39 ± 0.5

0.786

Creatinine (umol/L)

78.1 ± 2.2

79.8 ± 2.3

0.586

Urea nitrogen (mmol/L)

5.23 ± 0.23

4.88 ± 0.2

0.263

Hemoglobin (g/L)

123 ± 3.4

129 ± 2.7

0.199

Hematocrit

0.43 ± 0.03

0.37 ± 0.01

0.390

Type of surgery (n)

0.107

 Right/Left hemicolectomy

11

7

 Sigmoidectomy

1

6

 Rectum anterior resection

28

27

 Systolic blood pressure (mmHg)

139.9 ± 20.4

138.4 ± 22.4

0.755

 Diastolic blood pressure (mmHg)

78.8 ± 11.7

79.3 ± 12.0

0.851

 Heart rate (min⁻¹)

71.2 ± 10.7

71.1 ± 11.7

0.976