Table 1 Baseline characteristics in 381 Boston braced patients

Age at start brace treatment (years)

11.5 (7.7–15.5)

11.4 (7.5–16.0)

13.7 (6.9–17.1)^a

Bone age at start brace treatment (years)

10.8 (7–14)

10.4 (5–13)

13.2 (7–16)^a

Bone – Chronological age difference at start brace treatment (years)

−0.8 (−2.7–0.8)

−1.0 (−4.0–2.0)^b

−0.5 (−3.2–2.1)

Age at menarche (years)

13.6 (11–16)

13.7 (11–16)

13.4 (7–19)

(n = 25)

(n = 51)

(n = 262)

Major curve standing without brace at start of treatment (°)

34.3 (20–56)

29.8 (21–52)^c

33.6 (20–57)

Major curve prone without brace at start of treatment (°)

24.3 (8–41)

19.1 (7–42)^d

23.7 (9–45)

Major curve standing in brace (°) at start of treatment

15.7 (4–37)

11.3 (1–37)^c

17.4 (1–44)

Major curve flexibility (°)

10.0 (1–22)

10.7 (2–23)

9.9 (−2–24)

Major curve flexibility (%)

29.1 (5–73)

36.1 (7–70)^e

29.6 (−5–69)

Major curve redressment (°)

18.7 (1–46)

18.6 (8–33)

16.2 (3–35)^f

Major curve redressment (%)

53.7 (4–86)

62.9 (25–97)^e

48.9 (7–96)