Table 6.
Demographic and preoperative radiographic data for LD and HD groups
| Variable | LD group (n=57) | HD group (n=65) | p-value |
|---|---|---|---|
| Age (yr) | 15.0±1.95 | 15.0±1.82 | 0.98 |
| Gender (male:female) | 4:53 | 12:53 | |
| Weight (kg) | 55.8±13.3 | 56.4±13.2 | 0.79 |
| Height (cm) | 160.3±8.0 | 162.2±10.5 | 0.31 |
| Body mas index (kg/m2) | 21.1±3.9 | 22.5±5.9 | 0.18 |
| Risser sign | 0.91 | ||
| Grade 0 | 8 (14.0) | 6 (9.2) | |
| Grade 1 | 7 (12.3) | 12 (18.5) | |
| Grade 2 | 10 (17.5) | 12 (18.5) | |
| Grade 3 | 10 (17.5) | 12 (18.5) | |
| Grade 4 | 12 (21.1) | 12 (18.5) | |
| Grade 5 | 10 (17.5) | 11 (16.9) | |
| Preoperative major Cobb angle (°) | 55.5±7.2 | 55.1±7.3 | 0.77 |
| Preoperative T2–T12 kyphosis angle (°) | 34.7±9.7 | 33.5±7.9 | 0.49 |
| Preoperative rib index | 1.9±0.3 | 1.9±0.3 | 0.53 |
| Preoperative curve flexibility (%) | 50.1±13.1 | 49.7±16.8 | 0.90 |
| Follow-up time (mo) | 38.0±14.2 | 42.0±14.4 | 0.13 |
Values are presented as mean±standard deviation or number (%), unless otherwise stated. No significant between group differences were detected for these variables.
LD, low-screw density; HD, high-screw density.