Table 2 Postoperative parameters of natural pressure drainage group and negative pressure drainage group

Albumin count on the first postoperative day, g·L^− 1

33.24 ± 3.52

32.17 ± 5.03

0.035^b

Hemoglobin on the first postoperative day, g·L^− 1

126.01 ± 15.03

115.19 ± 16.25

0.000^a

Platelet count on the first postoperative day, 10⁹·L^− 1

200.47 ± 46.77

201.53 ± 52.42

0.894^b

Drainage volume on the first postoperative day, ml

93.25 ± 63.58

119.46 ± 54.48

0.000^b

Total drainage volume, ml

355.60 ± 189.69

434.37 ± 149.12

0.000^b

Drainage tube indwelling time, d

3.29 ± 1.17

3.45 ± 0.97

0.023^b

Postoperative hospital stays, d

5.17 ± 1.58

5.15 ± 1.58

0.928^b

Complications

NA

 Deep incision infection

0

0

NA

 Symptomatic hematoma

0

0

NA