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Table 2 Results at weaning and last follow-up control in 381 Boston braced patients

From: Early weaning in idiopathic scoliosis

Characteristic A. Unplanned early weaning B. Planned early weaning C. Ordinary bracing
n = 32 n = 59 n = 290
Age at weaning (years) 14.3 (9.6–16.6) 14.9 (11.0–18.9)a 16.3 (12.4–19.8)b
Bone age at weaning (years) 13.6 (9–15) 13.9 (11–16) 15.8 (11–18)b
Bone – Chronological age difference at stop brace treatment (years) −0.7 (−3.6–2.1) −1.0 (−4.0–2.0)c −0.4 (−3.2–2.5)
Time in brace at weaning (months) 31.9 (6–82) 36.4 (12–71)d 31.1 (6–113)
Number of patients in brace time subgroups (months) <24 / ≥24 and <36 / ≥36 and <48/≥48 16/7/1/8 16/18/12/13 91/117/56/26
Major curve standing at weaning (°) 35.0 (6–58) 20.6 (1–45)e 29.3 (6–58)f
Time to last follow-up after weaning (years) 24.2 (2.7–30.4) 23.1 (15.0–30.7) 23.4 (2.4–32.1)
Major curve standing at last follow-up (°) 34.8 (13–62) 25.1 (9–54)e 34.0 (7–81)
Major curve difference at last follow-up relative to start bracing (°) 0.5 (−23–21) −4.7 (−28–23)a 0.5 (−22–51)
Number (%) operatedg 12 (38) 1 (2) 14 (5)
  1. Patients with resumed bracing and operated patients included. Values are means (range)
  2. aDifferent from A (p < 0.05) and C (p < 0.001)
  3. bDifferent from A and B (p < 0.001)
  4. cDifferent from C (p < 0.001)
  5. dDifferent from C (p < 0.05)
  6. eDifferent from A (p < 0.001) and C (p = 0.001)
  7. fDifferent from A (p = 0.005) and B (p < 0.001)
  8. gKendall’s Tau-b −0.1929 (−0.3223 to −0.0635); p < 0.005
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