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Table 4 Cochrane risk of bias (RoB 2) tool for randomised controlled trials

From: The use of three implants to support a fixed prosthesis in the management of the edentulous mandible: a systematic review

Year First Author Study design Random sequence generation (selection bias) Blinding of participants and personnel (Performance bias) Blinding of outcome assessment (Detection bias) Incomplete outcome data (Attrition bias) Selection reporting (Reporting Bias) Other sources of bias Overall risk of bias
2011 De Kok [15] Prospective RCT Some concerns Some concerns Some concerns Low risk Low risk None Some concerns
2018 Cannizzaro [20] Prospective RCT High risk High risk Some concerns Low risk Low risk None High risk