Turn your clinical problem into a PICO question
Fill in the four parts and this writes the question your supervisor is asking for — and the PubMed search that goes with it.
What PICO is actually for
PICO is not a formatting exercise. It exists because a vague question cannot be searched and cannot be answered. “Does early mobilisation help?” has no population, no comparison and no outcome, so there is no set of papers that either supports or refutes it. Every appraisal you attempt afterwards inherits that vagueness.
The four parts do specific work. Population decides which studies are even eligible. Intervention and Comparison decide what the effect is measured against — and “usual care” is a real comparison that needs defining, because usual care differs between wards. Outcome decides what counts as success, and it must be something you can actually obtain from your records.
The question type matters more than most people are told. It determines which study design can answer you, and therefore which appraisal checklist applies later. A therapy question appraised with a diagnostic checklist produces a confident, wrong answer.
A practical warning about the search: databases index populations and interventions well and outcomes poorly. If your search returns nothing, the outcome term is usually the culprit, not the absence of evidence.
Frequently asked questions
Do I always need a comparison?
No. Prevalence and experience questions often have none, and forcing one in distorts the question. But for any therapy question, leaving the comparison blank usually means you have not yet decided what you are comparing against — and 'usual care' still needs defining, because it varies by ward.
My search returns thousands of results. What now?
Add the comparison term back, then restrict the population. Narrowing the outcome is the last thing to try, because outcome terms are inconsistently indexed and you will lose relevant papers before you lose irrelevant ones.
Is PICO the same as PICOT or PECO?
They are the same skeleton. PICOT adds an explicit timeframe, useful when the outcome is time-dependent, such as 30-day readmission. PECO swaps Intervention for Exposure and is used for aetiology and harm questions, where nobody assigned the exposure.
Can I use this for a service evaluation or audit?
Partly. An audit compares practice against an agreed standard rather than testing an intervention, so it needs a standard and a sample, not a comparison group. Build the population and outcome here, then move to the audit sample size tool.
The book behind this tool
The Evidence-Based Practice Project Workbook
Take a clinical question from PICO to an implemented, evaluated change in practice.