Table 3 Comparison of RBC, HGB, HCT and other indicators between the two groups before and after surgery (n = 20, ‾x ± s)

Low volume group

preoperative

39.8 ± 4.5

91.3 ± 4.1

30.3 ± 1.4

331.4 ± 10.3

4.3 ± 0.5

132.5 ± 17.4

postoperative

35.4 ± 4.4

91.5 ± 3.7

30.2 ± 1.2

330.6 ± 7.7

3.9 ± 0.5

122.5 ± 14.0

\(\bar {\rm d}\)±s_d

4.4 ± 3.6

-0.2 ± 1.4

0.l ± 0.8

0.9 ± 9.8

0.5 ± 0.4

10.0 ± 6.2

t

5.492

0.633

0.323

0.389

5.783

7.265

P

0.000*

0.554

0.751

0.701

0.000*

0.000*

High volume group

preoperative

38.9 ± 7.0

93.8 ± 4.5

30.9 ± 1.7

329.1 ± 11.2

4.4 ± 0.5

132.7 ± 17.3

postoperative

36.6 ± 4.8

93.4 ± 4.3

30.9 ± 1.9

331.0 ± 10.7

3.7 ± 0.7

120.7 ± 16.7

\(\bar {\rm d}\)±s_d

2.3 ± 7.3

0.4 ± 1.3

-0.l ± 0.8

-1.9 ± 9.9

0.7 ± 0.4

12.1 ± 7.8

t

1.400

1.258

0.411

0.859

7.618

6.882

P

0.178

0.224

0.686

0.401

0.000*

0.000*

t*

1.153

1.308

0.515

0.885

1.883

0.920

P

0.256

0.199

0.609

0.382

0.067

0.363