Table 2.

Variables categorized as different grades

	Grade 1	Grade 2	Grade 4	Grade 5
Age of onset	≤ 5 years	> 5 years
Apical vertebrae	Above T5	T6-T10	T11-T12
Main curve	< 120	120–150	> 150
Kyphosis	< 90	90–120	121–150	> 150
T1-T12 distance (mm)	< 100	100–140	141–180	> 180