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Table 2 Grading of the recommendations according to the level of evidence.

From: A Dutch guideline for the treatment of scoliosis in neuromuscular disorders

Level 1

At least one systematic review (A1) or at least 2 independent studies with evidence level A1 or A2

Level 2

At least two independent studies with evidence level B

Level 3

One study with evidence level A2 or B or multiple studies of level C

Level 4

Expert opinion