TABLE 1. Descriptive Parameters.
| Cohort | NP | P | |
|---|---|---|---|
| n | 133 | 80 | 53 |
| Age (yr) | 12.6 ± 1.2 | 12.6 ± 1.2 | 12.6 ± 1.2 |
| Sex | |||
| Male | 16 | 7 | 9 |
| Female | 117 | 73 | 44 |
| Risser | |||
| 0 and TR open | 48 | 22 | 26 |
| 0 and TR closed | 47 | 30 | 17 |
| 1 | 38 | 28 | 10 |
| Cobb angle (°) | 22.1 ± 8.4 | 21.3 ± 8.3 | 23.4 ± 8.6 |
| Follow-up (mo) | 36.7 ± 13.6 | 35.1 ± 14.2 | 38.9 ± 12.3 |
| Type | |||
| RT | 35 | 22 | 13 |
| RT-LL | 22 | 10 | 12 |
| LL-RT | 26 | 18 | 8 |
| Triple | 7 | 1 | 6 |
| LTL | 36 | 26 | 10 |
| Other | 7 | 3 | 4 |
| Treatment | |||
| Observation | 51 | 44 | 7 |
| Brace | 67 | 36 | 31 |
| Surgery | 15 | 0 | 15 |
NP indicates nonprogressive; P, progressive; n, sample size; TR, triradiate cartilage; RT, right thoracic; RT-LL, right thoracic-left lumbar; LL-RT, left lumbar-right thoracic; LTL, left thoracolumbar; other, left thoracic, right lumbar.