Table 2 Assessment of methodological quality of included trials
Study | Study design | Data analysis | Allocation generation | Allocation concealment | Blinding | Lost to follow-up |
|---|---|---|---|---|---|---|
Andersen, 2000 | RCT | ITT | Unclear | Unclear | None reported | 9.5% at 12 months |
Devoogdt, 2011 | RCT | ITT | Adequate | Adequate | Assessor blinded | 4% at 12 months |
Didem, 2005 | RCT | PP | Sealed envelopes | Adequate | Patient blinded | 5.4% at 1 months |
Johansson, 1998 | RCT | PP | Unclear | Unclear | None reported | None |
Johansson, 1999 | RCT | PP | Inadequate | Unclear | None reported | None |
McNeely, 2004 | RCT | PP | Computer-generated | Adequate | Assessor blinded | 11.1% at 1 months |
Williams, 2002 | RCT crossover | PP | Unclear | Unclear | None reported | None |
Sitzia, 2002 | RCT | PP | Computer-generated | Adequate | None reported | 3.6% at 2 weeks |
Szolnoky, 2009 | RCT | ITT | Unclear | Unclear | None reported | None |
Torres Lacomba, 2010 | RCT | PP | Computer-generated | Unclear | Assessor blinded | 3.3% at 12 months |