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Table 3 Assessment of risk of bias in individual studies

From: Meta-analysis of ART outcomes in women with different preconception TSH levels

Study

Selection bias

Performance bias

Detection bias

Attrition bias

Reporting bias

Other bias

Sampling bias

Measurement bias

Coelho 2016

+

?

Aghahosseini 2013

?

+

Mintziori 2014

+

+

+

Unuane 2017

+

+

+

Michalakis 2011

+

?

+

?

+

Muller 1999

+

+

?

Chai 2014

+

+

+

Weghofer 2015

?

+

+

?

+

Baker 2006

?

+

+

Karmon 2014

?

+

Cai 2017

?

?

+

Seungdamrong 2017

+

+

Zhang 2012

+

+

+

Ba 2013

+

?

Reh 2010

+

+

+

?

+

Zeng 2014

?

+

?

Gingold 2016

?

+

+

Wu 2017

?

+

+

  1. + high risk of bias; − low risk of bias;? unclear risk of bias