Table 2.
First author, publication year | Random sequence generation | Allocation concealment | Blinding of participants | Blinding of outcome assessment | Duration |
---|---|---|---|---|---|
Aurilio 2009 | Unclear | High | Unclear | Unclear | Unclear |
Bohme 2003 | Unclear | Unclear | Low | Low | Unclear |
Bono 1997 | Low | Unclear | Low | Unclear | Unclear |
Brema 1996 | Unclear | Unclear | Unclear | Unclear | Low |
De Conno 1987 | Unclear | Unclear | Unclear | Unclear | Unclear |
Dini 1986 | Unclear | Unclear | Low | Unclear | Unclear |
Kjaer 1982 | Unclear | High | Unclear | Low | Unclear |
Likar 2007 | Unclear | Low | High | High | Low |
Noda 1989 | Unclear | Unclear | Unclear | Unclear | High |
Pace 2007 | Low | Unclear | Unclear | Unclear | Unclear |
Poulain 2008 | Low | Low | Low | Unclear | Unclear |
Sittl 2003 | Unclear | Unclear | Unclear | Unclear | High |
Sorge 2004 | Low | High | High | Unclear | Unclear |
Taguchi 1982 | Unclear | Unclear | Low | Unclear | Unclear |
Ventafridda 1983 | Unclear | Unclear | Unclear | Unclear | Unclear |
Wirz 2009 | Low | Unclear | High | High | High |
Low: low risk of bias; high: high risk of bias; Unclear: Unclear risk of bias.