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. 2010 Oct 6;2010(10):CD008505. doi: 10.1002/14651858.CD008505.pub2

1. Levels of quality of individual studies.

Judgement of risk of bias Quality rating of study
Risk of bias of all domains low High methodological quality = ‘high quality study’
Unclear or high risk of bias for one or more domains Low methodological quality = ‘low quality study’
High risk of bias for most domains Very low methodological quality = ‘very low quality study’