Table 3 Clinical outcomes of normal oxygenation group, simple hypoxemia group, and ARDS group after surgery

Lactate(mmol/L,M [IQR])

3.4(2.4–5.1)

2.8(2.0-3.6)

3.3(2.3–4.9)

4.6(3.1-7.0)

< 0.001^a

OI(M [IQR])

132.0

(100.0-300.0)

304.0

(301.0-309.0)

130.0

(110.0-161.3)

96.0

(88.0-114.0)

< 0.001^b

AKI (n, %)

46(21.7)

4(7.8)

19(19.4)

23(36.5)

0.001^c

Liver insufficiency (n, %)

60(28.3)

13(25.5)

25(25.5)

22(34.9)

0.380

Cerebral infarction(n, %)

14(21.7)

2(3.9)

3(3.1)

9(4.3)

0.013^d

re-tracheal intubation

3(1.4)

0(0)

0(0)

3(4.8)

0.039

APACHE II (score, M [IQR])

14.0 (12.0–17.0)

12.0 (11.0–14.0)

14.0 (12.0–16.0)

17.0 (14.0–21.0)

< 0.001^e

Mechanical ventilation time (h, M [IQR])

43.0 (31.0-80.5)

36.5 (23.8.0–45.0)

40.0 (30.8–57.1)

86.0 (57.3–158.0)

< 0.001^f

ICU stay length (day, M [IQR])

5.0 (3.0–7.0)

4 0.0(3.0–6.0)

4.0 (3.0-5.3)

7.0 (6.0-11.5)

< 0.001 ^g

Post-operative hospital stay length (day, M [IQR])

15.0 (12.0–20.0)

15.0 (11.0–18.0)

13.0 (11.0-17.3)

18.0 (14.0-24.5)

< 0.001 ^h

In-hospital mortality (n, %)

3 (1.4)

1 (0.2)

0 (0)

2 (3.2)

0.158

Mortality rate at 30 days after discharge (n, %)

8 (3.7)

2 (3.9)

2 (2.0)

4 (6.3)

0.371