Study | Randomisation appropriate | Allocation concealment appropriate | Blinding patient / investigator / outcome assessor | Selective reporting improbable | Absence of other factors potentially causing bias | ITT analysis appropriate | Risk of bias (study level) |
---|---|---|---|---|---|---|---|
Elder [19] | unclear | unclear | yes / unclear / unclear | uncleara, b | noc | nod | high |
Mulla [20] | unclear | unclear | no / no / unclear | noa, e | noc, f | unclear | high |
Williams [22] | unclear | unclear | no / no / unclear | noa, g | noc | noh | high |
Kazemier [21] | yes | yes | yes / yes / yes | yes | yes | yes | low |