Table 3 Risk of bias of randomized controlled trials
Study | Randomization | Allocation concealment | Blinding | Incomplete outcome data | Selective reporting | Other potential sources of bias | Risk of bias |
|---|---|---|---|---|---|---|---|
Milsom 2001 [31] | Unclear method of randomization | Unclear: not discussed | High risk: unable to blind due to type of intervention | Low risk | Low risk | Unclear risk: not intention to treat analysis. Patients randomized after laparoscopy | High |
Maartense 2006 [30] | Unclear method of randomization | Low risk: sealed envelopes | High risk: unable to blind due to type of intervention | Low risk | Low risk | None | High |