Table 2 The type of surgery performed, the estimated blood loss and duration of surgery

Type of surgery

Thyroid surgery

18

8.2

Breast surgery

13

5.9

Hernia surgery

2

0.9

Upper GI surgery

15

6.8

Hepato-pancreatico-biliary surgery

65

29.5

Colorectal surgery

33

15

Skin and deep tissue surgery

6

2.7

Vascular surgery

60

27.3

Splenectomy/adrenalectomy

8

3.6

Estimated blood loss

Less than 500 ml

143

65

500–999 ml

41

18.6

1000–1499 ml

11

5

1500 ml or more

10

4.5

Unreported

15

6.8

Duration of surgery

< 4 h

179

81.4

4 or more hours

41

18.6