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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
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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