Table 2.
Characteristics of the nine included studies.
| Author | Year | Country | Study Period | Study Design | Study Population | Case | Surgical Extent | Prevalence of contralateral occult PTC (%) | Quality assessment |
|---|---|---|---|---|---|---|---|---|---|
| Chen XH (12) | 2020 | China | 2014/1–2017/9 | Retrospective | PTC | 921 | TT/NT+CLND/CLND+LLND | 16.7 | 6 |
| Feng JW (16) | 2020 | China | 2011/1–2018/1 | Retrospective | PTC | 552 | TT+CLND/CLND+LLND | 16.1 | 7 |
| Gu JL (17) | 2020 | China | 2012/9–2014/9 | Retrospective | PTC | 300 | TT+CLND/CLND+LLND | 18.3 | 7 |
| Koo BS (18) | 2010 | Korea | 2005/3–2009/3 | Retrospective | PTMC | 132 | TT+CLND | 16.7 | 7 |
| Lv T (19) | 2018 | China | 2014/1–2016/12 | Retrospective | PTC | 1442 | TT+CLND | 46.9 | 7 |
| Wan HF (13) | 2015 | China | 2011/1–2013/12 | Prospective | PTMC | 89 | TT+ selective LND | 40.4 | 7 |
| Wang N (11) | 2020 | China | 2016/5–2018/6 | Retrospective | PTC | 586 | TT+ cervical LND | 11.95 | 6 |
| Zhou YL (20) | 2012 | China | 2010/11–2011/11 | Prospective | PTMC | 100 | TT+CLND | 20 | 6 |
| Our new data | 2021 | China | 2016/1–2021/1 | Retrospective | PTC | 204 | TT+CLND/CLND+LLND | 13.2 | 7 |
PTC, papillary thyroid carcinoma; PTMC, papillary thyroid microcarcinoma; TT, total thyroidectomy; NT, near-total thyroidectomy; CLND, central lymph node dissection; LLND, lateral lymph node dissection; LND, lymph node dissection.