Table I.
Patient demographics.
| Variable | Value |
|---|---|
| Mean age at surgery, yrs (SD; range) | 12.7 (1.5; 8.2 to 16.7) |
| Sex, F:M | 54:3 |
| Lenke curve type,24 1:2:3:4:5:6 | 48:6:1:0:1:1 |
| Preoperative | |
| Mean Risser grade (SD; range) | 0.5 (SD 0.9; 0 to 3) |
| Mean Sanders score (SD) | 3.3 (1.2) |
| Premenarchal, n (%) | 42/54 (78) |
| Mean height, cm (SD; range) | 154.2 (8.5; 137.2 to 179.1) |
| Mean mass, kg (SD; range) | 43.7 (10.2; 30 to 80.1) |
| Mean BMI, kg/m2 (SD; range) | 18.3 (3.1; 14.1 to 31.3) |
| Mean length of follow-up, mths (SD; range) | 40.4 (9.3; 11 to 56) |
| Most recent follow-up | |
| Mean Risser grade (SD; range) | 4.3 (1.02; 0 to 5) |
| Mean height, cm (SD; range) | 162.3 (7.2; 148.7 to 184.0) |
| Mean mass, kg (SD; range) | 55.4 (10.2; 38.6 to 92.9) |
| Mean BMI, kg/m2 (SD; range) | 21.1 (3.5; 13.4 to 36.2) |
| Tether location, n | |
| Thoracic | 55 |
| Lumbar | 2 |
| Vertebrae tethered, mean (SD; range) | |
| Thoracic tether | 7.3 (0.7; 6 to 9) |
| Lumbar tether | 5.5 (0.7; 5 to 6) |
| Mean operating time, mins (SD; range) | |
| Thoracic tether | 221.9 (101.3; 110 to 505) |
| Lumbar tether | 295.5 (30.4; 274 to 317) |
| Mean blood loss, ml/kg (SD; range) | |
| Thoracic tether | 5.5 (3.8; 0.9 to 18.8) |
| Lumbar tether | 6.1 (1.3; 5.2 to 6.96) |
| Mean length of stay, days (SD; range) | 4.7 (1.4; 3 to 10) |
BMI, body mass index.