Table 1

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

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