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Table 2 Risk bias assessment according to according to the Cochrane collaborations tool

From: Efficacy of platelet-rich fibrin in promoting the healing of extraction sockets: a systematic review

Study Random sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data
Castro et al. [41]  +  n.a  +   + 
Sharma et al. [54]  +  n.a  + 
Mourao et al. [56]  +  n.a  + 
Canellas et al. [47]  +  n.a  +   +   + 
Ahmed et al. [53] n.a  + 
Areewong et al. [55]  +  n.a  + 
Ustaoglu et al. [42]  +  n.a Participant -
Personnel + 
 +   + 
Giudice et al. [40]  +  n.a  +   + 
Kumar et al. [43] n.a ?  + 
Asmael et al. [58] n.a
Clark et al. [39]  +  n.a ?  +   + 
Alzahrani et al. [44] n.a  + 
Temmerman al. [50]  +  n.a  + 
Marenzi et al. [57]  +  n.a ? ?  + 
Suttapreyasri et al. [45] n.a  + 
Hauser et al. [46] ? n.a ?  + 
Thakkar et al. [52]  +  n.a  + 
Yewale et al. [51]  +  n.a  +   + 
  1.  + low ristk, −high risk, ? unclear risk, n.a., not applicable