Table 6 Multivariate analysis of massive intraoperative blood loss
95% CI for OR | ||||||||
|---|---|---|---|---|---|---|---|---|
Massive intraoperative blood loss | Variables in the equation | B | SE | Wald | P | OR | Lower | Upper |
≥ 1,000 mL | Height, cm | 0.06 | 0.04 | 1.66 | 0.256 | 1.21 | 0.93 | 1.39 |
Weight, kg | -0.02 | 0.03 | 0.20 | 0.357 | 0.97 | 0.91 | 1.24 | |
Cobb angle, degree | 0.89 | 0.54 | 3.44 | 0.111 | 1.19 | 0.99 | 1.58 | |
Number of vertebral levels fused | 0.89 | 0.22 | 10.51 | 0.010 | 1.69 | 1.31 | 3.11 | |
Osteotomy pattern | ||||||||
Fusion without osteotomy | 44.49 | 0.000 | ||||||
Smith-Peterson osteotomy | 1.19 | 0.54 | 4.71 | 0.063 | 2.29 | 0.72 | 9.66 | |
Ponte osteotomy | 3.02 | 0.45 | 44.41 | 0.000 | 20.53 | 8.44 | 49.93 | |
≥ 1,500 mL | Age, year | 0.14 | 0.10 | 1.78 | 0.199 | 1.18 | 0.95 | 1.64 |
Height, cm | 0.04 | 0.02 | 2.83 | 0.094 | 1.03 | 0.99 | 1.16 | |
Weight, kg | -0.01 | 0.03 | 0.14 | 0.741 | 0.99 | 0.92 | 1.14 | |
Cobb angle, degree | 0.87 | 0.89 | 4.01 | 0.401 | 1.17 | 0.90 | 1.37 | |
Number of vertebral levels fused | 0.61 | 0.19 | 11.51 | 0.000 | 2.00 | 1.33 | 2.99 | |
Osteotomy pattern | ||||||||
Fusion without osteotomy | 14.83 | 0.001 | ||||||
Smith-Peterson osteotomy | 1.19 | 0.95 | 1.57 | 0.210 | 3.29 | 0.51 | 21.24 | |
Ponte osteotomy | 3.02 | 0.78 | 14.80 | 0.000 | 23.33 | 4.40 | 35.37 | |