Table 1.

Patient demographic characteristics

Parameters	Statistic
Total patients	765
Gender(M/F)	128/637
Age	14.5 ± 1.7
Weight, kg	47.9 ± 7.9
Height, cm	161.2 ± 8.0
Total blood loss, ml	1285.7 ± 437.5
Intraoperative blood loss, ml	926.8 ± 521.1
Hidden blood loss, ml	693.5 ± 473.4
Postoperative drainage, ml	464.2 ± 200.2
Change of Hct(%)	11.0 ± 10.9
Intraoperative transfusion volume, ml	672.4 ± 657.1
Postoperative transfusion volume, ml	126.5 ± 242.9
Change of Hb, g/L	36.8 ± 13.9
Mean operation time, min	250.1 ± 60.5
Mean BMI, kg/m2	18.4 ± 2.8