Table 1.
Characteristics of the study population at the time of RAI therapy according to events.
| Clinical Features | All (n = 606) |
Event (n = 42) |
No Event (n = 564) |
p-Value |
|---|---|---|---|---|
| Age (years) | 44 ± 14 | 47 ± 17 | 44 ± 14 | 0.12 |
| Male gender, n (%) | 106 (17) | 12 (29) | 94 (17) | 0.05 |
| ATA risk, n (%) | - | - | - | - |
| Low risk | 153 (25) | 2 (4) | 151 (30) | <0.01 |
| Intermediate risk | 320 (53) | 20 (48) | 300 (53) | 0.48 |
| High risk | 133 (22) | 20 (48) | 113 (20) | <0.001 |
| Papillary type, n (%) | 301 (50) | 23 (55) | 278 (49) | 0.49 |
| Follicular type, n (%) | 109 (18) | 5 (12) | 104 (18) | 0.29 |
| Mixed, n (%) | 194 (32) | 13 (31) | 181 (32) | 0.88 |
| Time interval surgery/therapy (days) | 99 ± 46 | 88 ± 44 | 100 ± 46 | 0.10 |
| Administered 131I activity (MBq) | 3589 ± 922 | 3612 ± 814 | 3552 ± 925 | 0.69 |
| Pre-therapy off Tg (ng/mL) | 16 ± 39 | 43 ± 64 | 14 ± 35 | <0.001 |
| Pre-therapy off Tg ≥ 10 ng/mL, n (%) | 198 (33) | 22 (52) | 92 (16) | <0.001 |
| Post-therapy WBS, n (%) | - | - | - | - |
| Thyroid bed | 594 (98) | 42 (100) | 552 (98) | 0.34 |
| Suspicious for lymph nodes | 38 (6) | 4 (10) | 34 (6) | 0.37 |
Data are presented as mean ± SD or number and percentage (%). Tg (thyroglobulin), WBS (whole body scan).