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. 2021 Dec 24;13:769462. doi: 10.3389/fnagi.2021.769462

Figure 2.

Figure 2

Bias assessment. Diagram presenting the risk of bias assessment of the studies included according to the Newcastle-Ottawa quality assessment scale (NOS). The number of stars indicates the quality of the reviewed article: Good quality: 3 or 4 stars in selection domain AND 1 or 2 stars in comparability domain AND 2 or 3 stars in outcome/exposure domain; Fair quality: 2 stars in selection domain AND 1 or 2 stars in comparability domain AND 2 or 3 stars in outcome/exposure domain; Poor quality: 0 or 1 star in selection domain OR 0 stars in comparability domain OR 0 or 1 stars in outcome/exposure domain (Wells et al., 2000).