Table 1 Patients demographics and baseline characteristics

Age (years)

66.3 ± 4.6

66.7 ± 3.2

0.379

Male sex [n (%)]

88 (63.8%)

76 (55.1%)

0.177

BMI (kg/m²)

23.1 ± 3.2

23.3 ± 3.2

0.610

ASA classification

0.723

 I level [n (%)]

18 (13.0%)

16 (11.6%)

 II level [n (%)]

95 (68.8%)

101 (73.2%)

 III level [n (%)]

25 (18.2%)

21 (15.2%)

Comorbidities

 Hypertension [n (%)]

51 (37.0%)

62 (44.9%)

0.221

 Diabetes mellitus [n (%)]

34 (24.6%)

29 (21.0%)

0.321

 Coronary artery disease [n (%)]

26 (18.8%)

31 (22.5%)

0.552

 COPD [n (%)]

48 (34.8%)

57 (41.3%)

0.697

Smoking

 History [n (%)]

117 (85%)

112 (81%)

0.522

 Smoking index (n/d × years)

340 (240–580)

360 (278–558)

0.225

 Preoperative hemoglobin (g/l)

123.8 ± 12.7

121.4 ± 12.4

0.116

 Preoperative FEV₁ (%)

2.7 ± 0.7

2.6 ± 0.6

0.993

 Oxygenation index (mmHg)

384 (356–436)

381 (341–436)

0.470

 Preoperative BUN (mmol/l)

4.1 ± 1.5

4.2 ± 1.4

0.895

 Preoperative creatinine (μmol/l)

90.0 ± 27.8

86.5 ± 18.3

0.217

 Preoperative NT-proBNP (pg/ml)

171.8 ± 54.9

166.6 ± 48.4

0.407

 Preoperative CK-MB (ng/ml)

3.5 ± 1.3

3.3 ± 1.3

0.201

 Preoperative troponin T (ng/ml)

0.009 (0.007–0.011)

0.009 (0.007–0.012)

0.586

Tumor stage

0.620

 Tis

25

24

 TI

15

18

 TII

76

81

 TIII

22

15