Nursing Research
Levels of Evidence Hierarchy
The hierarchy of evidence ranks research studies based on their clinical rigor and potential for bias to inform Evidence-Based Practice (EBP).
Hierarchy Tiers
- Level I: Systematic reviews or meta-analysis of randomized controlled trials (RCTs).
- Level II: Single well-designed randomized controlled trial.
- Level III: Controlled trials without randomization (quasi-experimental).
- Level IV: Case-control or cohort studies.
- Level V: Systematic reviews of descriptive or qualitative studies.
- Level VI: Single descriptive or qualitative study.
- Level VII: Expert opinion or consensus reports.
Clinical Application
- Use Level I-III evidence for clinical decision-making when possible.
- Higher levels of evidence provide the strongest recommendations for nursing interventions.
- Always evaluate the quality and currency of the source regardless of level.
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