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Table 1 Levels of evidence (adapted and modified from van Tulder et al [33])

From: Effectiveness of physical therapy interventions for children with cerebral palsy: A systematic review

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