|
Reasons for excluding papers |
|
| Reason for exclusion |
Number of papers |
|
|
|
| Before/after studies |
17 |
| Brief report given only |
6 |
| Case control study |
5 |
| Phase II trial (no control arm) |
4 |
| Randomisation not mentioned in full text |
2 |
| Allocated by patients' choice |
1 |
| Allocated by patients' economic status |
1 |
|
|
|
| Total |
36 |
Zhang et al. Trials 2008 9:22 doi:10.1186/1745-6215-9-22 |
|