Patient Characteristics
| Characteristic | Value |
| Age (y) | |
| Median | 75 (52–85) |
| Mean ± SD | 73.3 ± 7.3 |
| Female (n) | 24 (64.9%) |
| Thyroid disorder (n) | |
| Unifocal autonomy | 6 (16.2%) |
| Multifocal autonomy | 18 (48.6%) |
| Nontoxic goiter | 13 (35.2%) |
| Thyroid volume (mL) | |
| Median | 87.5 (24–299) |
| Mean ± SD | 103 ± 60 |
| Retrosternal part (n) | 12 (32.4%) |
| Thyroid-stimulating hormone (mU/mL) | |
| Median | |
| Before 131I RAIU measurement | 0.33 (0.01–2.86) |
| Before 124I RAIU measurement | 0.33 (0.01–2.71) |
| Mean ± SD | |
| Before 131I RAIU measurement | 0.54 ± 0.84 |
| Before 124I RAIU measurement | 0.52 ± 0.77 |
Data in parentheses are range or percentage.