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Table 1 OHAT risk of bias assessment

From: Maxillary sinus augmentation using chairside bone marrow aspirate concentrates for implant site development: a systematic review of histomorphometric studies

  Study
de Oliveira et al. [12] Pasquali et al. [7] Payer et al. [2] Sauerbier et al. [11] Sauerbier et al. [14] Wildburger et al. [15]
Selection bias
 Was administered dose or exposure level adequately randomized? ++ ++ ++ −− ++ ++
 Was allocation to study groups adequately concealed? NR NR NR −− + NR
Performance bias
 Were the research personnel and human subjects blinded to the study group during the study? −− −− −− −− + −−
Detection bias
 Can we be confident in the exposure characterization?
 Can we be confident in the outcome assessment? ++ ++ ++ ++ ++ ++
Attrition bias
 Were outcome data complete without attrition or exclusion from analysis? ++ ++ + ++
Reporting bias
 Were all measured outcomes reported? ++ ++ ++ ++
  1. ++ definitely low risk of bias, + probably low risk of bias, −/NR probably high risk of bias, −− definitely high risk of bias, NR not reported