|
Levels of evidence (adapted and modified from van Tulder et al [33]) |
|
| Strong |
Consistent findings among multiple high-quality RCTs |
| Moderate |
Consistent findings among multiple low-quality RCTs and/or one high-quality RCT |
| Limited |
One low-quality RCT |
| Conflicting |
Inconsistent findings among multiple trials |
| No evidence |
No RCTs |
Anttila et al. BMC Pediatrics 2008 8:14 doi:10.1186/1471-2431-8-14 |
|