Which example of best practice review would likely be assigned a Level I?
1. Information from the only existing study of an intervention.
2. Information from review of several randomized controlled trials of an intervention.
3. Information from the opinion of a person widely recognized as an expert in the use of the intervention.
4. Information from a non-randomized well-designed controlled trial of the intervention.
2
Explanation: 1. This is considered as level VI evidence.
2. Level I evidence is the highest or best level. It is evidence from a systematic review or meta-analysis of all relevant randomized controlled trials (RCTs) or evidence based clinical practice guidelines based on systematic reviews of RCTs.
3. Expert opinion is level VII evidence.
4. This type of evidence is categorized as level III.
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