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. 2016 Mar 10;11(3):e0150863. doi: 10.1371/journal.pone.0150863

Fig 2. Risk of bias and study quality assessment.

Fig 2

Top: Reporting of five key study quality indicators was found to be poor in many cases. Bottom: Using SYRCLE's risk of bias tool, the risk of selection, performance, detection, attrition and other biases was assessed. Lack of (adequate) reporting of measures to reduce bias resulted in a high percentage of unclear risk of bias for most items.