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Table 2 Risk of bias assessment for clinical studies

From: Systematic review on diabetes mellitus and dental implants: an update

Risk of bias assessment Cochrane risk of bias tool I New Castle–Ottawa Scale Based on Moga et al. (2012) Number of studies
High risk of bias  < 3  < 4  < 2 4
Moderate risk of bias 3–5 4–6 2–3 9
Low risk of bias 6–8 7–9 4 26