Table 4.
Rate of local lymph node metastasis in patients with crPTC and mPTC from 2008 to 2013
| Period | 94–95 | 96–97 | 98–99 | 00–01 | 02–03 | 04–05 | 06–07 | 08–09 | 10–11 | 12–13 | 14–15 | Total | P for difference | P for trend |
| crPTC, n (%) | 3 (23.1) | 5 (33.3) | 6 (50.0) | 19 (59.4) | 17 (41.5) | 24 (27.6) | 35 (29.7) | 73 (30.7) | 130 (34.7) | 243 (34.9) | 330 (22.2) | 885 (28.4) | <0.001 | <0.001 |
| mPTC, n (%) | 2 (100) | 0 (0) | 1 (20.0) | 3 (42.9) | 0 (0) | 3 (15.0) | 20 (29.9) | 23 (16.0) | 62 (15.8) | 129 (19.0) | 84 (15.6) | 327 (17.5) | 0.005 | 0.087 |
| P value | 0.032 | 0.331 | 0.252 | 0.425 | 0.017 | 0.243 | 0.978 | 0.001 | 0.000 | 0.000 | 0.001 |
crPTC, clinical relevant papillary thyroid carcinoma; mPTC, micropapillary thyroid carcinoma.