Table 3. Multivariable Analysis of Risk Factors for Reoperation.
| Variable | Hazard Ratio (95% CI) | P Value |
|---|---|---|
| Older age, per decade | 0.84 (0.74-0.95) | .007 |
| Tumor size, cm | ||
| 0 to 1 | 1 [Reference] | NA |
| >1 to 2 | 0.74 (0.30-1.80) | .50 |
| >2 to 4 | 1.86 (0.93-3.75) | .08 |
| >4 | 1.60 (0.74-3.48) | .23 |
| Lymph node metastasis | ||
| None | 1 [Reference] | NA |
| Present | 3.43 (2.00-5.90) | <.001 |
| Lymph nodes examined, No. | 1.01 (1.00-1.02) | .01 |
| Extent of initial surgery | ||
| ST/TT | 1 [Reference] | NA |
| Lobectomy | 0.22 (0.03-1.65) | .14 |
| Lobectomy followed by CT | 0.59 (0.26-1.37) | .22 |
| ST/TT plus central ND alone | 1.08 (0.53-2.19) | .84 |
| ST/TT plus central and lateral ND | 0.53 (0.30-0.93) | .03 |
| Other | 1.53 (0.72-3.24) | .27 |
Abbreviations: CT, completion thyroidectomy; NA, not applicable; ND, neck dissection; ST/TT, subtotal or total thyroidectomy.