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Table 2 Blood loss after surgery and hemoglobin and hematocrit levels before and after surgery

From: 3-h drain clamping is not effective to reduce total blood loss after primary total knowledge

 

3 h drain clamping group

(n = 43)

Control group

(n = 43)

P value

Total drained blood, mL

338 ± 190.2

839 ± 339.8

<0.001

Total blood loss, mL

1226.9 ± 488.1

1127.1 ± 424.5

0.315

Hidden blood loss, mL

893.1 ± 487.7

294.7 ± 531.8

<0.001

Hemoglobin, g/dL

 Preoperation

12.7 ± 1.3

13.0 ± 1.3

0.286

 Postoperative 1 day

9.7 ± 1.1

10.2 ± 1.5

0.216

 Postoperative 2 day

8.9 ± 1.0

9.6 ± 1.4

0.105

Hematocrit, percentage

 Preoperation

36.8 ± 4.1

37.5 ± 3.6

0.397

 Postoperative 1 day

28.3 ± 3.3

29.2 ± 3.8

0.243

 Postoperative 2 day

26.6 ± 3.3

28.1 ± 3.7

0.061

  1. Normally distributed data given as mean ± standard deviation