Demographics | Age 10–18 | Age 19–30 | Total | p-value |
---|---|---|---|---|
Sex, n (%) | ||||
 Male | 110 (10.4) | 30 (2.8) | 140 (13.2) | 0.09 |
 Female | 773 (73.1) | 144 (13.6) | 917 (86.8) | |
Age (year) | 14.3 ± 1.9 | 22.5 ± 3.2 | 15.6 ± 3.7 | < 0.01 |
Menarche age (year) | 12.3 ± 1.2 | 12.8 ± 1.2 | 12.4 ± 1.2 | < 0.01 |
Distribution by Lenke type, n (%) | ||||
 1 | 413 (39.0) | 83 (7.9) | 496 (46.9) | 0.48 |
 2 | 189 (17.9) | 38 (3.6) | 227 (21.5) | |
 3 | 23 (2.2) | 8 (0.8) | 31 (2.9) | |
 4 | 27 (2.6) | 3 (0.3) | 30 (2.8) | |
 5 | 159 (15.0) | 25 (2.4) | 184 (17.4) | |
 6 | 72 (6.8) | 17 (1.6) | 89 (8.4) | |
Height (cm) | 156.4 ± 7.7 | 160.0 ± 8.1 | 157.0 ± 7.8 | < 0.01 |
Weight (kg) | 45.2 ± 8.8 | 50.0 ± 9.1 | 46.0 ± 9.0 | < 0.01 |
Body mass index (kg/m2) | 18.4 ± 3.1 | 19.5 ± 3.4 | 18.6 ± 3.2 | < 0.01 |
Body surface area (m2) | 1.4 ± 0.2 | 1.5 ± 0.2 | 1.4 ± 0.2 | < 0.01 |
Preoperative haemoglobin (g/dL) | 13.7 ± 1.2 | 13.6 ± 1.4 | 13.7 ± 1.2 | 0.10 |
Preoperative major curve Cobb angle (°) | 66.7 ± 17.3 | 65.4 ± 16.5 | 66.5 ± 17.1 | 0.36 |
Risser sign, n (%) | 3.3 ± 1.5 | 4.9 ± 0.6 | 3.6 ± 1.5 | < 0.01 |
 0 | 73 (8.3) | 0 | 73 (6.9) |  |
 1 | 49 (5.5) | 0 | 49 (4.6) |  |
 2 | 120 (13.6) | 0 | 120 (11.4) |  |
 3 | 102 (11.6) | 0 | 102 (9.6) |  |
 4 | 395 (44.7) | 12 (6.9) | 407 (38.5) |  |
 5 | 144 (16.3) | 162 (93.1) | 306 (28.9) |  |
Operative Data | ||||
 Number of screws | 14.1 ± 2.3 | 14.3 ± 2.4 | 14.1 ± 2.4 | 0.33 |
 Number of levels fused | 10.3 ± 2.2 | 10.3 ± 2.1 | 10.3 ± 2.2 | 0.84 |
 Proximal level of fusion, median | T3 | T3 | T3 | – |
 Distal level of fusion, median | L3 | L2 | L2 | – |
 Screw density (screws/vertebral level) | 1.27 ± 0.20 | 1.29 ± 0.24 | 1.27 ± 0.21 | 0.20 |
 Duration of surgery (min) | 143.9 ± 48.4 | 161.1 ± 52.0 | 146.8 ± 49.4 | < 0.01 |
 Postoperative haemoglobin (g/dL) | 10.9 ± 1.5 | 10.9 ± 1.6 | 10.9 ± 1.5 | 0.96 |
 Total blood loss (mL) | 945.4 ± 535.7 | 990.5 ± 502.5 | 952.9 ± 530.4 | 0.31 |
 Estimated blood volume (mL) | 3103.0 ± 499.7 | 3376.1 ± 539.0 | 3148.0 ± 516.1 | < 0.01 |
 Total blood loss/estimated blood volume (%) | 30.8 ± 17.4 | 29.9 ± 15.9 | 30.7 ± 17.1 | 0.51 |
 Allogeneic blood transfusion n (%) | 46 (4.3) | 7 (0.7) | 53 (5.0) | 0.51 |
 Length of stay (days) | 3.4 ± 0.9 | 3.6 ± 1.2 | 3.5 ± 0.9 | 0.12 |
 Estimated blood salvage (ml) | 485.6 ± 305.6 | 505.5 ± 297.7 | 488.9 ± 304.3 | 0.43 |