Table 1.
Basic characteristics of included studies.
| The first author | Published year | Country | Case size | TT with PCND | TT alone | Included indexes |
|---|---|---|---|---|---|---|
| Ahn JH (14) | 2021 | Korea | 101 | 51 | 50 | ⑦⑨ |
| Barczynski M (7) | 2013 | Germany | 640 | 358 | 282 | ⑦⑧⑨⑩ |
| Calò PG (22) | 2017 | Italy | 133 | 30 | 103 | ⑥⑨⑩ |
| Conzo G (9) | 2014 | Italy | 752 | 362 | 390 | ③④⑨⑩ |
| Dobrinja C (19) | 2017 | Italy | 186 | 74 | 112 | ⑦⑧⑨⑩ |
| Hartl DM (18) | 2013 | France | 246 | 155 | 91 | ⑥⑧⑩ |
| Hyun SM (11) | 2012 | Korea | 152 | 65 | 87 | ③⑤⑥ |
| Jin SH (21) | 2020 | Germany | 108 | 54 | 54 | ③⑤⑥⑨ |
| Kim BY (16) | 2019 | Korea | 164 | 82 | 82 | ③⑥ |
| Korkmaz MH (23) | 2017 | Turkey | 302 | 162 | 140 | ⑧⑨⑩ |
| Moo TA (20) | 2010 | America | 81 | 45 | 36 | ⑥⑦⑨⑩ |
| Roh JL (17) | 2007 | Korea | 155 | 82 | 73 | ①②③④ |
| So YK (15) | 2012 | Korea | 232 | 119 | 113 | ①②③④ |
| Viola D (10) | 2015 | Italy | 181 | 93 | 88 | ⑩ |
| Yazici D (12) | 2020 | Germany | 358 | 258 | 100 | ⑤⑥⑦⑧⑨⑩ |
Observation indexes: ①Transient hypocalcemia;②Permanent hypocalcemia;③Transient vocal cord paralysis;④Permanent vocal cord paralysis;⑤Extrathyroid extension;⑥ local recurrence;⑦Transient recurrent laryngeal never injury;⑧Permanent recurrent laryngeal nerve injury; ⑨Transient hypoparathyroidism; ⑩Permanent hypoparathyroidism.