Clinicopathological characteristics
| IS group (n=100) | IR group (n=44) | p value | |
|---|---|---|---|
| Sex (F:M) | 72:28 | 37:7 | 0.119 |
| Age (years) | 47.2±1.1 | 47.5±1.9 | 0.885 |
| Body mass index (m2/kg) | 23.4±0.3 | 23.5±0.5 | 0.848 |
| Positive of preoperative auto antibody (n) | 22 (22.0%) | 8 (18.2%) | 0.630 |
| Preoperative TSH (μIU/mL) | 1.8±0.1 | 2.0±0.1 | 0.671 |
| Postoperative TSH (μIU/mL) | |||
| 3 months | 3.6±0.2 | 4.5±0.5 | 0.049 |
| 6 months | 3.6±0.2 | 5.2±0.7 | 0.026 |
| 12 months | 3.1±0.2 | 3.7±0.4 | 0.419 |
| 24 months | 3.0±0.1 | 3.1±0.3 | 0.275 |
| Tumor size (cm) | 1.0.±0.1 | 0.9±0.1 | 0.740 |
| Diagnosis (n) | 0.243 | ||
| Papillary cancer | 83 | 39 | |
| Benign | 15 | 5 | |
| Follicular cancer | 2 | 0 | |
| Retrieved lymph node (n) | 5.1±0.3 | 6.1±0.6 | 0.141 |
| Metastatic lymph node (n) | 0.5±0.1 | 0.7±0.2 | 0.444 |
| Thyroiditis (n) | 14 (14.0%) | 9 (20.5%) | 0.330 |
IR: isthmus removing, IS: isthmus saving, TSH: thyroid stimulating hormone