Figure 1.

Changes in thyroid volume during the one year period after iodine-131 therapy in hypothyroid and non-hypothyroid patients. Mean thyroid volumes in hypothyroid vs. non-hypothyroid patients were 36.3 ml vs. 31.9 ml at 0 months (m), 20.3 ml vs. 23.2 ml at 1 m, 13.6 ml vs. 18.8 ml at 3 m, 10.9 ml vs. 14.8 ml at 5 m, 8.2 ml vs. 13.1 ml at 8 m, and 6.3 ml vs. 10.9 ml at 12 m after iodine-131 therapy.