| Stage | Characteristics |
|---|---|
| Stage 0 | No signs |
| Stage 1 | Unilateral disease |
| Stage 1.5 | Unilateral disease affecting axial muscles |
| Stage 2 | Bilateral disease without balance impairment |
| Stage 2.5 | Mild bilateral disease, slight postural reflex impairment, but able to self-correct |
| Stage 3 | Mild to moderate bilateral disease, some postural instability, some dependence |
| Stage 4 | Severe disability, but able to stand or walk independently |
| Stage 5 | Cannot get out of bed or live in a wheelchair |
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