Research question and medical perspective (Part 2)

We will explore how to formulate effective research questions and select the best study designs to answer them, following the principles of Evidence-Based Practice (EBP).

Key Steps in EBP:

1. Formulate an answerable question
2. Search for the best evidence
3. Critically appraise the evidence
4. Integrate findings with clinical expertise
5. Evaluate the outcomes

Once a research question is identified, it’s important to search for high-quality evidence, often represented in the hierarchy of evidence pyramid—with systematic reviews and meta-analyses at the top, followed by randomised controlled trials (RCTs), cohort studies, and case-control studies.

Medical research examines populations from four main perspectives:

• Healthy Population (At Risk): Studies identifying risk factors (etiological studies).

• Early Disease Detection: Research on the best diagnostic tools (diagnostic studies).

• Treatment: Determining the most effective interventions (therapeutic studies).

• Prognosis: Predicting disease outcomes (prognostic studies).

Each type of research question requires a specific study design:

• Therapy Questions → Best answered by RCTs.

• Diagnosis Questions → Require cross-sectional studies.

• Prognosis Questions → Best answered by cohort studies.

• Etiology (Cause) Questions → Also use cohort studies.

For example:

• An RCT is ideal to compare a new diabetes drug vs. a standard treatment.

• A cohort study is better for investigating whether a sedentary lifestyle increases diabetes risk over time.

The PICO framework not only structures the research question but also guides study design selection. For instance, in a question like:

“Does mindfulness therapy reduce anxiety in teenagers compared to medication?”

• P: Teenagers with anxiety

• I: Mindfulness therapy

• C: Medication

• O: Reduction in anxiety

A systematic review or meta-analysis of RCTs would provide the best evidence.

Using PICO and selecting the right study design is essential for strong, evidence-based medical research. High-quality studies help improve clinical decision-making and patient care, making research both effective and impactful.