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Stage 0 No signs of disease. (1)
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Stage 1 Unilateral disease. (2)
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Stage 1.5 Unilateral plus axial involvement. (3)
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Stage 2 Bilateral disease, without impairment of balance. (4)
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Stage 2.5 Mild Bilateral disease, with recovery on pull test. (5)
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Stage 3 Mild to moderate bilateral disease, some postural instability; physically independent. (6)
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Stage 4 Severe disability; still able to walk or stand unassisted. (7)
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Stage 5 Wheelchair bound or bedridden unless aided. (8)