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Table 2 Risk of bias in included studies

From: Application of postoperative autotransfusion in total joint arthroplasty reduces allogeneic blood requirements: a meta-analysis of randomized controlled trials

Study Year A B C D E F G H I J K Total score
Heddle [12] 1992 1 1 1 0 0 N/A 1 1 N/A 1 1 7
Adalberth [13] 1998 1 1 0.5 1 1 N/A 1 1 N/A 1 1 8.5
Thomas [14] 2001 1 1 0 0.5 1 N/A 1 1 N/A 1 1 7.5
Cheng [15] 2005 1 1 0.5 1 0 N/A 0.5 1 N/A 1 1 7
Dramis [29] 2006 1 N/A 0.5 N/A N/A N/A 1 1 0.5 1 1 6
Abuzakuk [30] 2007 1 1 0.5 0.5 0.5 N/A 1 N/A N/A 1 1 6.5
Moonen [17] 2007 1 1 1 N/A N/A N/A 1 1 0.5 1 1 7.5
Smith [16] 2007 1 1 0.5 N/A N/A N/A 1 N/A N/A 1 1 5.5
Amin [31] 2008 1 1 0.5 1 1 N/A 1 N/A N/A 1 1 7.5
Atay [2] 2010 1 1 0.5 N/A N/A N/A 1 1 N/A 1 1 6.5
Cheung [18] 2010 1 1 0.5 N/A 0 N/A 1 1 N/A 1 1 6.5
Horstmann [32] 2012 1 1 0.5 1 0.5 N/A 1 N/A N/A 1 1 7
Kleinert [33] 2012 1 N/A 0.5 N/A N/A N/A 1 N/A N/A 1 1 4.5
Sarkanovic [7] 2013 1 1 1 N/A N/A N/A 1 N/A N/A 1 1 6
Horstmann [24] 2014 1 1 0 0.5 1 N/A 1 1 N/A 1 1 7.5
Thomassen [22] 2014 1 1 0.5 N/A N/A 1 1 1 N/A 1 1 7.5
Teetzmann [23] 2014 1 N/A 0.5 N/A N/A N/A 1 1 1 1 1 6.5
  1. RCT randomized controlled trial, N/A not clear
  2. Eleven Cochrane Back Review Group criteria: (A) the method of randomization was adequate; (B) the treatment allocation was concealed; (C) the groups were similar in the most important prognostic indicators at the baseline; (D) the patients were blinded to the intervention; (E) the caregivers were blinded to the intervention; (F) the outcome assessors were blinded to the intervention; (G) co-interventions were controlled; (H) compliance was acceptable in all groups; (I) the dropout rate was described and acceptable; (J) the timing of assessment in all groups was the same; and (K) intention-to-treat analysis was performed