What is PICO in evidence-based practice and how is it used?

• A. Population, Intervention, Comparison, Outcome; used to formulate clinical questions and guide literature search and appraisal.
• B. People, Intervention, Condition, Outcome; used to write prescriptions.
• C. Patient, Identification, Control, Outcome; used to design experiments.
• D. Problem, Intervention, Comparison, Outcome; used to draft guidelines.

Answer: (A)

PICO is a framework that helps you structure a clinical question so you can search for and appraise evidence effectively. It breaks the question into four parts: Population (the patients or problem you care about), Intervention (the treatment, exposure, or test you’re considering), Comparison (the alternative to compare with, such as standard care or placebo), and Outcome (the results you want to know about).

By specifying these parts, you form a precise question and generate targeted search terms for databases, set clear criteria for which studies to include or exclude, and focus your appraisal on whether a study’s Population, Intervention, Comparison, and Outcomes match your question. This approach makes it easier to find relevant studies and judge whether their findings apply to your patient or scenario. The familiar phrasing in practice is to express questions like: In Population with condition, does Intervention versus Comparison affect Outcome?

Other wordings don’t capture the same search-and-appraisal structure, so they aren’t the standard PICO framework.