Table 2.
Comparison of In-Brace and Out-of-Brace Deterioration Groups at Commencement of Bracing and Number of Months Bracing.
| Parameter (Median, mean ± SD) | In-brace deterioration | Out-of-brace deterioration | P value^ | Power |
|---|---|---|---|---|
| Age at bracing (Months) | 144.0 145.8 ± 12.9 |
147.0 148.8 ± 11.7 |
.171 | 0.33 |
| Period after menarche (months) for those post-menarche | 5.5 5.6 ± 3.6 |
4.0 4.9 ± 3.3 |
.620 | 0.24 |
| Pre-brace Cobb angle (°) | 32.0 32.0 ± 4.3 |
31.3 31.5 ± 3.7 |
.603 | 0.12 |
| Supine Cobb angle (°) | 25.6 24.8 ± 6.1 |
25.3 24.9 ± 5.3 |
.962 | 0.05 |
| Initial in-brace Cobb angle (°) | 21.2 21.1 ± 6.3 |
22.9 23.5 ± 6.5 |
.033* | 0.64 |
| Correction rate (%) | 32.7 34.2 ± 16.5 |
25.0 25.3 ± 17.6 |
.004* | 0.89 |
| Flexibility rate (%) | 18.7 22.5 ± 15.2 |
18.9 20.9 ± 13.3 |
.733 | 0.11 |
| Total number of months braced | 22.0 22.3 ± 9.8 |
16.0 16.9 ± 8.4 |
.004* | 0.95 |
| Time starting deterioration since first initiated brace (Months) | 13.0 14.6 ± 8.4 |
20.5 22.0 ± 8.7 |
<.001* | > 0.99 |
^Mann-Whitney U test.
*P < .05.