Reference | Styrud J 2006 | Hansson J 2009 | Vons C 2011 | Mentula P 2015 | Salminen P 2015 |
---|---|---|---|---|---|
Random sequence generation | + | + | + | + | + |
Allocation concealment | + | + | + | + | + |
Blinding of participants and personnel | – | – | – | – | – |
Blinding of outcome assessment | – | + | + | + | + |
Incomplete outcome data | – | + | + | + | / |
Selective reporting | / | / | / | / | / |
Other bias | / | / | / | / | / |