Question

identify whether the listed descriptor/variable represents the patient/population, intervention, comparison, or outcome variable for a pico research question.

patient/population
inervention
comparison
outcome

possible answers

• age
• therapy
• no disease
• death
• accuracy of diagnosis
• risk of disease
• alternative therapy
• risk factor or behavior (e.g., smoking)
• absence of risk factor or behavior
• exposure
• sex
• pathology, disease, or disorder
• improvement in pathology/disease/disorder
• ethnicity
• treatment
• placebo

Explanation:

Define the PICO framework components

Using the Evidence-Based Practice knowledge point, we define the four elements of a PICO question:

• P (Patient/Population/Problem): Characteristics of the patients or population (e.g., demographics, clinical conditions).
• I (Intervention/Exposure): The therapeutic strategy, risk factor, or exposure being investigated.
• C (Comparison): The alternative control, placebo, or absence of the risk factor being compared.
• O (Outcome): The clinical effects, measurements, or consequences of interest.

Categorize Patient/Population variables

We identify descriptors representing patient characteristics or their underlying clinical state:

• age (demographic descriptor)
• sex (demographic descriptor)
• ethnicity (demographic descriptor)
• pathology, disease, or disorder (the baseline clinical problem)

Categorize Intervention variables

We identify active exposures, treatments, or risk factors applied to the population:

• therapy (active treatment)
• treatment (active treatment)
• exposure (active exposure)
• risk factor or behavior (e.g., smoking) (active baseline exposure)

Categorize Comparison variables

We identify the control conditions or alternative baselines compared against the intervention:

• placebo (standard control)
• alternative therapy (alternative active control)
• no disease (baseline control state)
• absence of risk factor or behavior (control exposure state)

Categorize Outcome variables

We identify the clinical endpoints, measurements, or consequences of interest:

• death (clinical endpoint)
• accuracy of diagnosis (diagnostic performance measure)
• risk of disease (epidemiological outcome measure)
• improvement in pathology/disease/disorder (clinical response measure)

Answer:

• Patient/Population: age, sex, ethnicity, pathology, disease, or disorder
• Intervention: therapy, treatment, exposure, risk factor or behavior (e.g., smoking)
• Comparison: placebo, alternative therapy, no disease, absence of risk factor or behavior
• Outcome: death, accuracy of diagnosis, risk of disease, improvement in pathology/disease/disorder