Table 1 Mean age, preoperative and postoperative Cobb angle, number of fixation levels, operation time in minutes and EBL (estimated blood loss) in milliliters during the four surgical stages for each group.
From: Intraoperative blood loss during different stages of scoliosis surgery: A prospective study
Groups |  | Age | Cobb angle (°) | no of level | Time in min during different surgical stages | EBL in ml during different surgical stages | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Â | Pre op | Flexibility% | Post op | Â | Dissection | Screw insertion | Rod derotation | Bone grafting | Total | D-EBL | S-EBL | R-EBL | B-EBL | Total |
Total | Mean | 17.6 | 76.3 | 43.1 | 22.3 | 14.3 | 60.3 | 78.8 | 35.7 | 24.3 | 199.1 | 350.8 | 749.7 | 884.7 | 584.3 | 2569.4 |
| Â | SD | 7.3 | 24.0 | 10.1 | 16.2 | 1.9 | 19.2 | 23.2 | 14.1 | 7.4 | 44.3 | 270.3 | 554.7 | 597.8 | 423.7 | 1455.9 |
AIS (group 1) | Mean | 16.5 | 75.0 | 41.3 | 24.1 | 12.1 | 47.1 | 66.2 | 27.1 | 21.9 | 162.4 | 229.3 | 385.0 | 523.3 | 386.3 | 1523.9 |
| Â | SD | 9.1 | 25.3 | 9.1 | 19.4 | 1.4 | 13.5 | 16.8 | 7.8 | 5.3 | 26.3 | 164.9 | 171.3 | 379.8 | 265.5 | 669.0 |
CP (group 2) | Mean | 21.9 | 85.5 | 41 | 23.9 | 15.0 | 66.9 | 79.7 | 43.5 | 24.9 | 215.0 | 391.1 | 906.9 | 762.3 | 607.6 | 2667.9 |
| Â | SD | 7.1 | 21.5 | 11.3 | 16.2 | 1.3 | 12.3 | 28.0 | 14.2 | 7.9 | 34.6 | 256.5 | 539.2 | 325.9 | 396.0 | 1015.6 |
Paralytic (group 3) | Mean | 14.4 | 68.5 | 46.8 | 18.9 | 15.6 | 66.0 | 89.7 | 35.9 | 25.9 | 217.5 | 423.9 | 932.7 | 1344.3 | 745.7 | 3446.6 |
| Â | SD | 2.4 | 23.6 | 9.1 | 13.4 | 0.7 | 23.5 | 18.1 | 14.6 | 8.3 | 47.1 | 333.4 | 656.9 | 696.2 | 511.3 | 1770.8 |