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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

StudyAdequacy of Case DefinitionRepresentativeness of the CasesSelection of ControlsDefinition of ControlsCompara- bilityAscertainment of exposureSame method of ascertainmentNon-Response ratescore
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