SOLUTIONS GRADED A+.
Highest level of evidence #1 meta-analysis and systematic review
Lowest level of evidence #7 Background or "Expert" Opinion
Second level of evidence #2 Critically-Appraised Topics & Evidence Synthesis:
3rd level of evidence #3 Critically appraised individual articles:
Level 4 Evidence from Randomized Controlled Trials (RCT)
Level 5 Evidence from well-designed cohort study
Level 6 Evidence from a single descriptive or qualitative Case Study.
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