Table 1 Demographic and perioperative characteristics
Variables | Total (N = 97) | Low dose (N = 41) | High dose (N = 56) | p-value |
|---|---|---|---|---|
Age, years | 14.0 ± 2.0 | 14.2 ± 2.0 | 13.9 ± 2.0 | 0.522 |
Sex | 0.124 | |||
Male Female | 19 (19.6) 78 (80.4) | 11 (26.8) 30 (73.2) | 8 (14.3) 48 (85.7) | |
Height, cm | 156.4 ± 8.6 | 158.9 ± 8.5 | 156.5 ± 8.2 | 0.011 |
Weight, kg | 44.6 ± 9.3 | 49.9 ± 9.9 | 40.7 ± 6.6 | < 0.001 |
BMI, kg/m2 | 18.2 ± 3.1 | 19.7 ± 3.7 | 17.0 ± 1.80 | < 0.001 |
Cobb Angle, °, median (IQR) | 58.5 (51.8–71.0) | 59.0 (52.5–78.5) | 63.0 (52.3–75.8) | 0.841 |
Lenke Classification | 0.125 | |||
1 2 3 4 5 6 | 41 (42.3) 18 (18.6) 3 (3.1) 1 (1.0) 24 (24.7) 10 (10.3) | 22 (53.7) 7 (17.1) 2 (4.9) 1 (2.4) 7 (17.1) 2 (4.9) | 19 (33.9) 11 (19.6) 1 (1.8) 0 17 (30.4) 8 (14.3) | |
Number of vertebrae fused, median (IQR) | 12.0 (10.8–13.0) | 12.0 (11.0–13.0) | 12.0 (11.0–13.0) | 0.929 |
Number of screws, median (IQR) | 14.0 (12.0–14.0) | 14.0 (12.0–14.0) | 14.0 (12.0–15.0) | 0.883 |
Duration of surgery, minute | 105.9 ± 21.5 | 110.9 ± 22.0 | 102.2 ± 20.5 | 0.049 |
Skin incision length, cm | 29.4 ± 4.6 | 30.1 ± 4.5 | 29.0 ± 4.6 | 0.242 |
Estimated blood loss, mL | 625.8 ± 315.2 | 658.6 ± 376.5 | 601.9 ± 262.5 | 0.384 |
Intraoperative remifentanil usage, µg | 1247.7 ± 272.9 | 1232.3 ± 320.3 | 1259.0 ± 234.7 | 0.636 |
Intraoperative remifentanil usage, µg/kg | 28.70 ± 7.24 | 24.79 ± 4.43 | 31.56 ± 7.60 | < 0.001 |
Intraoperative remifentanil usage, µg/kg/min, median (IQR) | 0.215 (0.191–0.241) | 0.189 (0.169–0.202) | 0.251 (0.228–0.276) | < 0.001 |
Duration of remifentanil infusions, minute | 127.3 ± 26.3 | 134.9 ± 22.0 | 123.4 ± 23.7 | 0.017 |