Table 5 Risk factors associated with massive intraoperative blood loss
Volume of intraoperative blood loss | ≥ 500 to < 1000 mL | ≥ 1,000 mL | P | ≥ 500 to < 1500 mL | ≥ 1,500 mL | P |
|---|---|---|---|---|---|---|
N | 148 | 254 | 310 | 92 | ||
Sex | 0.073 | 0.052 | ||||
Male | 49 | 89 | 99 | 39 | ||
Female | 99 | 165 | 211 | 53 | ||
Age, year | 13.16 ± 2.21 | 12.84 ± 2.19 | 0.081 | 12.70 ± 2.08 | 13.44 ± 1.91 | 0.036* |
Height, cm | 146.55 ± 12.11 | 154.62 ± 11.09 | 0.020* | 149.80 ± 12.09 | 157.55 ± 11.78 | 0.000* |
Weight, kg | 38.20 ± 8.91 | 43.48 ± 7.88 | 0.001* | 39.83 ± 9.76 | 45.44 ± 8.12 | 0.001* |
Cobb angle, degree | 55.79 ± 0.99 | 63.40 ± 1.14 | 0.000* | 58.19 ± 1.26 | 66.21 ± 1.32 | 0.000* |
Number of vertebral levels fused | 7.18 ± 1.10 | 10.46 ± 0.89 | 0.000* | 7.98 ± 1.29 | 12.38 ± 0.78 | 0.000* |
Osteotomy pattern | 0.000* | 0.000* | ||||
Fusion without osteotomy, n | 140 (94.59) | 189 (74.41) | 269 (86.77) | 61(66.30) | ||
Smith-Peterson osteotomy, n | 8 (5.41) | 40 (15.75) | 31(10.00) | 16 (17.40) | ||
Ponte osteotomy, n | 0 (0.00) | 25 (9.84) | 10 (3.23) | 15 (16.30) |