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Levels of evidence
Pronunciation
A ranking system used to describe the strength of the results measured in a clinical trial or research study. The design of the study (such as a case report for an individual patient or a randomized double-blinded controlled clinical trial) and the endpoints measured (such as survival or quality of life) affect the strength of the evidence. (NCI Dictionary)
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A question about an individual's level of support from their friends and family.
A question about an individual's level of social activity.
Opinion of respected authorities based on clinical experience, descriptive studies, or reports of expert committees.
Opinions of respected authorities based on clinical experience, consensus statements from expert committees, or authoritative reviews.
Prospective, nonrandomized, controlled trials; prospective cohort studies; prospective case series; and cross-sectional studies.
