Table 2 Blood tests, details of surgery, and total psoas muscle index

Blood tests, median (IQR)

 pH

7.40 (7.36–7.45)

7.41 (7.37–7.43)

0.667

 Lactate

  mg/dL

19 (12–38)

16 (11–24)

0.079

 Albumin

  g/dL

3.3 (2.8–3.7)

3.9 (3.2–4.3)

 < 0.001

 White blood cell

   × 1000/μL

9.1(6.7–13)

10.7 (7.2–15)

0.143

 Platelet

   × 10000/μL

22.3 (17.3–27.6)

21.2 (17.3–27.4)

0.934

 Hemoglobin

  g/dL

12.8 (10.5–15.1)

13.5 (12.2–15.3)

0.108

 Creatine

  mg/dL

1.1 (0.7–1.9)

0.9 (0.7–1.2)

0.051

 C-reactive protein

  mg/dL

4.6 (0.9–13)

3.1 (0.2–13)

0.171

Details of surgery

 ASA score, n, (%)

 < 0.001

  I

1 (1.4)

12 (7.2)

  II

22 (31.0)

109 (65.3)

  III

42 (59.2)

42 (25.1)

  IV

6 (8.5)

4 (2.4)

Operation

 Time, median (IQR)

  min

110 (69.0–146.5)

111 (76.5–154.0)

0.599

 Surgical intervention, n (%)

0.003

  Major

42 (59.2)

62 (37.1)

  Intermediate-Minor

29 (40.8)

105 (62.9)

Total psoas muscle index (IQR)

 Total psoas muscle index

  cm²/m²

1.84 (1.48–2.13)

2.46 (1.99–2.96)

 < 0.001

 Density of psoas muscle

  HU

40.3 (30.8–46.2)

38.4 (31.4–45.7)

0.618