In PICO questions, which component is optional?

In PICO questions, which component is optional?

• A. patient
• B. intervention
• C. outcome
• D. comparison

Answer: (D)

The comparison component is optional. In framing a question with the PICO structure, you typically define the Population, the Intervention, and the Outcome to know who you’re studying, what you’re doing to them, and what result you care about. The Comparison describes what the Intervention is being measured against, but not all questions have a natural or necessary comparator. For questions focused on whether an intervention can affect an outcome, or for prognosis/harm questions, you can omit the comparator and still formulate a useful question. Including a comparator sharpens the test of effect, but its absence doesn’t invalidate the question and can broaden the evidence you search for.

The comparison component is optional. In framing a question with the PICO structure, you typically define the Population, the Intervention, and the Outcome to know who you’re studying, what you’re doing to them, and what result you care about. The Comparison describes what the Intervention is being measured against, but not all questions have a natural or necessary comparator. For questions focused on whether an intervention can affect an outcome, or for prognosis/harm questions, you can omit the comparator and still formulate a useful question. Including a comparator sharpens the test of effect, but its absence doesn’t invalidate the question and can broaden the evidence you search for.