Table 1 Demographic and clinical data for the two study groups

Mean age,years

59.58 ± 10.112

59.05 ± 11.204

60.1 ± 9.001

0.645

Sex (male, %)

36(45%)

17(42.5%)

19(47.5%)

0.653

Mean weights(kg)

59.12 ± 8.991

59.75 ± 7.801

58.49 ± 10.103

0.534

Preoperative WBC(10^9/L)

6.71 ± 2.29

6.49 ± 1.96

6.94 ± 2.59

0.386

Operation time (mean hours ± SD)

3.47 ± 0.782

3.76 ± 0.745

3.19 ± 0.715

0.001

 Histological Stage(n,%)

0.599

  I A

32(40%)

17(42.5%)

15(37.5%)

  I B

32(40%)

16(40%)

16(40%)

  II B

6(7.5%)

2(5%)

4(10%)

  III A

10(12.5%)

5(12.5%)

5(12.5%)

Time to first postoperative defecation (mean day ± SD)

2.89 ± 2.365

2.88 ± 1.305

2.9 ± 3.103

0.237

Chest tube duration time(mean day ± SD)

4.7 ± 3.188

3.28 ± 1.502

6.13 ± 3.763

0.001

Total chest drainage volume(ml ± SD)

979.88 ± 678.675

653 ± 289

1306 ± 794

0.001

Average pain intensity during the first 5 days (mean intensity ± SD)

2.06 ± 0.789

1.76 ± 0.682

2.36 ± 0.78

0.001

1st day’s WBC(10^9/L)

16.75 ± 4.146

15.59 ± 3.949

17.91 ± 4.058

0.01

1st day’s PCT(ng/ml)

1.324 ± 3.065

0.502 ± 0.53

2.146 ± 4.167

0.001

5th day’s WBC(10^9/L)

11.33 ± 3.408

9.93 ± 3.176

12.74 ± 3.067

0.001

5th day’s PCT(ng/ml)

0.500 ± 0.670

0.263 ± 0.230

0.737 ± 0.861

0.001

Postoperative length of stay

(mean day ± SD)

11.19 ± 4.198

11.7 ± 3.376

10.68 ± 4.875

0.016