Table 8.
Cox proportional hazards model demonstrating factors associated with recurrence-free survival in overt PTMC patients.
| Characteristics | HR | 95% CI | P-value |
|---|---|---|---|
| Sex | |||
| Female | 1 | ||
| Male | 1.665 | 0.442–6.267 | 0.451 |
| Age (Y) | |||
| ≥45 | 1 | ||
| <45 | 2.676 | 0.974–7.348 | 0.056 |
| Tumor size (mm) | |||
| ≤ 5 | 1 | ||
| >5 | 3.517 | 1.019–12.140 | 0.047 |
| Multifocality | |||
| Absence | 1 | ||
| Presence | 10.440 | 2.199–49.563 | 0.003 |
| ETE | |||
| Absence | 1 | ||
| Presence | 8.831 | 3.005–25.954 | <0.001 |
| Vascular invasion | |||
| Absence | 1 | ||
| Presence | 2.563 | 0.509–12.907 | 0.254 |
| CLNM | |||
| Absence | 1 | ||
| Presence | 4.624 | 1.366–15.649 | 0.014 |
| LLNM | |||
| Absence | 1 | ||
| Presence | 20.243 | 5.193–78.917 | <0.001 |
PTMC, papillary thyroid microcarcinoma; Y, year; ETE, extrathyroidal extension; CLNM, central lymph node metastasis; LLNM, lateral lymph node metastasis; HR, Hazard ratio.95% CI, 95% confidence interval. The bold values mean the P <0.05.