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Table 2 Quality assessment of Newcastle-Ottawa scale

From: Clinicopathologic predictors of central lymph node metastases in clinical node-negative papillary thyroid microcarcinoma: a systematic review and meta-analysis

First author, year (references)

Selection

Comparability

Exposure

Score

Gui, CY 2018 [15]

☆☆☆

☆

☆☆☆

7 stars

Zhou, YL 2012 [9]

☆☆☆

☆☆

☆☆☆

8 stars

Yuan, J 2017 [10]

☆☆☆

☆☆

☆☆☆

8 stars

Kim, BY 2012 [16]

☆☆☆

☆☆

☆☆☆

8 stars

Park, JP 2014 [17]

☆☆☆

☆

☆☆☆

7 stars

Zhang, LY 2015 [11]

☆☆☆

☆

☆☆☆

7 stars

Xu, D 2014 [18]

☆☆☆

☆

☆☆☆

7 stars

So, YK 2010 [19]

☆☆☆

☆☆

☆☆☆

8 stars

Caliskan, M 2012 [20]

☆☆☆

☆

☆☆☆

7 stars

Zhang, Q 2019 [21]

☆☆☆

☆

☆☆☆

7 stars

Feng, JW 2020 [22]

☆☆☆

☆

☆☆☆

7 stars

Zhang, C 2020 [23]

☆☆☆

☆☆

☆☆☆

8 stars

Liu, C 2021 [12]

☆☆☆

☆

☆☆☆

7 stars