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