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Table 1 Risk of bias of trials included in the present studya

From: Effect of standardized training on the reliability of the Cochrane risk of bias assessment tool: a prospective study

Source of bias

Low risk

Unclear risk

High risk

Random sequence generation

29 (52)

27 (48)

0 (0)

Allocation concealment

13 (23)

42 (75)

1 (2)

Blinding of patients

16 (29)

7 (13)

33 (59)

Blinding of therapists

4 (7)

1 (2)

51 (91)

Blinding of outcome assessors

22 (39)

12 (21)

22 (39)

Incomplete outcome data

17 (30)

13 (23)

26 (46)

  1. Displayed values are number of trials and percentage
  2. aFrom consensus between a pair of experienced raters