Level 5 evidence is best described as which type?

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Level 5 evidence refers to statements based on expert opinion and consensus rather than data from controlled studies. In the usual evidence hierarchy, the strongest evidence comes from systematic reviews and randomized trials, followed by well-designed observational studies. Expert opinion sits at the bottom because it relies on clinical experience and judgment without the backing of rigorous data. The other options describe higher-quality study designs: systematic reviews of randomized trials synthesize multiple trials; case series are descriptive reports without controls; and case-controlled studies are observational but still involve data and analysis. Therefore, expert opinion best fits Level 5, as it captures informed clinical judgment in areas where robust research is lacking and signals where further high-quality studies are needed. In practice, use this guidance with awareness of its limitations and seek higher-level evidence to confirm or refine these recommendations.