Trial*

Components of risk of bias/key risk criteria

Summary within trial

Comments on high risk components―(explain briefly why)

1

2

3

4

5

6

Crogan et al. (2008)

H

H

H

H

L

H

H = 5

L = 1

U = 0

Selection bias: No identification of sequent generation or allocation concealment.

Detection/Performance bias: No blinding of assessors mentioned.

Other bias: No protocol. Choice of statistics questionable.