Figure 2

Percent reductions in thyroid volume during the one year period after iodine-131 therapy in hypothyroid and non-hypothyroid patients. Mean percent reductions in thyroid volume in hypothyroid vs. non-hypothyroid patients were 42.6% vs. 24.2% at 1 month (m), 61.2% vs. 37.6% at 3 m, 70.1% vs. 46.5% at 5 m, 76.6% vs. 56.9% at 8 m, and 82.2% vs. 62.4% at 12 m after iodine-131 therapy.