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Table 2 Muscle index (MI)

From: Total thyroidectomy (Tx) versus thionamides (antithyroid drugs) in patients with moderate-to-severe Graves’ ophthalmopathy – a 1-year follow-up: study protocol for a randomized controlled trial

Normal MI:

<  5.0

 

Mild Graves’ orbitopathy

4.5–5.5

Grade I

Moderate Graves’ orbitopathy

5.5–6.5

Grade II

Severe Graves’ orbitopathy

> 6.5

Grade III