Comparison of early (< 2 yr) versus later (≥ 2 yr) follow-up patterns using the χ2 test
| Follow-up modality | χ2 | p value, 2-sided |
|---|---|---|
| Last physical exam | 1.512 | 0.46 |
| Serum Tg | 4.276 | 0.37 |
| Anti-Tg Ab | 3.633 | 0.46 |
| TSH | 4.279 | 0.37 |
| T4 | 3.988 | 0.41 |
| Cervical ultrasonography | 5.104 | 0.28 |
| RAI scan | 2.833 | 0.59 |
| CT scan | 2.318 | 0.68 |
| MRI | 0.276 | 0.87 |
| PET | 1.142 | 0.56 |
CT = computed tomography; DxWBS = diagnostic whole body radioiodine scan; MRI = magnetic resonance imaging; PET = positron emission tomography; RAI = radioactive iodine; TSH = thyroid stimulating hormone.