Level 2 Evidence: Prospective Cohort Study
In the hierarchy used to classify evidence-based research in medicine, level 2 evidence includes prospective cohort studies. A prospective cohort study includes a research question developed prior to patient enrollment. This research design is particularly useful for assessing patient outcomes following a specific treatment or for assessing a specific patient characteristic. Prospective cohort studies may be susceptible to selection bias and low rates of follow-up. Prospective cohort studies can be either controlled or uncontrolled.
KeywordsEvidence Prospective Cohort Therapeutic Prognostic Controlled Uncontrolled
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