Table 2.

Curve and bracing characteristics (n = 91)

Initial curve characteristics	Freq.	(%)
Curve type
Mid-thoracic	48	(5%)
Double major	16	(18%)
Thoracolumbar / lumbar	16	(18%)
Double thoracic	11	(12%)
Triple major	0	(0%)

Initial curve magnitude*	Mean	± SD	(Range)
Proximal thoracic (°)	14.0	± 7.43	(0–33)
Mid-thoracic (°)	28.1	± 10.11	(1–50)
Thoracolumbar / lumbar (°)	20.4	± 8.73	(0–43)
Maximum curve magnitude (°)	29.9	± 8.62	(12–50)
Maximum curve type (freq. (%))
Proximal thoracic	2	(2%)
Mid-thoracic	67	(74%)
Thoracolumbar / lumbar	14	(15%)
Maximum curve ≥ 30° (freq. (%))	30	(36%)
RVAD (n = 80; °)*	8.6	± 7.77	0–38

Bracing characteristics	Freq.	(%)	(Range)
Age at brace initiation (years; median(IQR))	7.9	± 1.41	(4.1–9.8)
Number braces (median (IQR))	3	2–3	(1–6)
Boston brace prescribed	82	(90%)
Non-compliant	53	(58%)
Brace-wear hours (median (IQR))	18	18–20	(8–23)
Bracing duration (years; mean ± SD)	4.6	± 1.93	(1.0–9.7)
Maximal curve magnitude in-brace (n = 87; °)*	15.6	± 7.66	(2–39)
Percent in-brace correction (n = 81; %)	58.3	± 23.97	(− 3.4–100.0)

Surgical intervention	Mean	± SD	(Range)
Progression to surgery (freq. (%))	61	(67%)
Age at surgery (years)	13.3	± 2.15	(9.3–20.9)
Final curve magnitude (°)	60.6	± 12.10	(33–93)

^*The number in parentheses (n =) indicates the number of patients with available data for the given characteristic

SD standard deviation, IQR interquartile range, RVAD rib-vertebral angle difference