Table 1.
Evidence base included in the review
| Category |
Number of records |
|
|---|---|---|
| Full papers | Abstracts | |
| Initial search | 121 | 26 |
| records excluded | 107 | 21 |
| records included | 14 | 5 |
| Additional studies identified | 1 | 1 |
| Total records included | 15 | 6 |
| Level 1 clinical evidence (systematic review, meta analysis) | 1 | 1 |
| Level 2 clinical evidence (RCT) | 13 | 1 |
| Level ≥3 clinical evidence | ||
| trials other than RCT | 0 | 3 |
| case reports | 1 | 0 |
| Economic evidence | 0 | 1 |
For definitions of levels of evidence, see Editorial Information on inside back cover.
RCT, randomized controlled trial.