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Table 3 Quality assessment using the Newcastle–Ottawa scale

From: Association of vascular endothelial growth factor polymorphisms with polycystic ovarian syndrome risk: a meta-analysis

Study

Adequacy of Case Definition

Representativeness of the Cases

Selection of Controls

Definition of Controls

Compara- bility

Ascertainment of exposure

Same method of ascertainment

Non-Response rate

score

Almawi 2016 [20]

*

*

*

*

*

*

*

*

8

Bao 2019 [21]

*

 

*

*

 

*

*

*

6

Ben Salem 2016 [22]

*

*

*

*

 

*

*

*

7

Ding 2009 [28]

*

 

*

*

 

*

*

*

6

Gomes 2019 [23]

*

 

*

*

 

*

*

*

6

Guruvaiah 2014 [24]

*

*

*

*

 

*

*

*

7

Huang 2019 [25]

*

*

*

*

 

*

*

*

7

Lee 2008 [26]

*

*

 

*

 

*

*

*

6

Li 2014 [29]

*

*

 

*

 

*

*

*

6

Vural 2009 [27]

*

*

 

*

 

*

*

*

6

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