Table 2 Impact of variables (gender, prior casting, kind of scoliosis, Risser stage, age at the beginning of treatment, Cobb angle at the beginning of treatment) on real respiratory capacity decrease at the beginning of brace treatment (FVC evolution in litres) and on the difference between the percentage to the theoretical vital capacity without and with CMCR brace.

Gender (**)

Girls

87

0.30 L

0.842

9.6

0.773

Boys

3

0.30 L

8

Kind of scoliosis

(**)

Double-major scoliosis

Thoraco-lumbar

67

0.20 L

7.8

scoliosis

13

0.30 L

0.138

10

0.122

Thoracic scoliosis

7

0.30 L

13

Risser stage at the beginning of treatment (**)

Patients Risser stage 0,

1 or 2

69

0.30 L

0.055*

10.4

0.097

Patients Risser stage 3

or 4

21

0.20 L

6.6

Age at the beginning of treatment (**)

Patients ≤ 11 years

12

0.30 L

0.037*

12.8

0.173

Patients > 11 years

78

0.20 L

9

Cobb angle at the beginning of treatment

Patients curve < 30°

84

0.26 L

0.31

9.5

1

Patients curve ≥ 30°

6

0.35 L

9.5