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Critical Appraisal

The Critical Appraisal section catches out clinical doctors more than any other part of the FRCEM SBA — not because it's hard, but because it's tested differently from the rest of the paper. This category gives you the focused, exam-ready stats and study-design knowledge needed to score full marks. Inside you'll find a structured guide to passing the FRCEM Critical Appraisal section, a plain-English explanation of p-values, confidence intervals, and the common biases tested, and a breakdown of the most common Critical Appraisal SBA questions with worked examples. You don't need to be a methodologist — you need to recognise study designs, interpret CIs and p-values correctly, spot the half-dozen biases the exam loves, and apply a small set of statistical concepts under time pressure. These guides give you exactly that.

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Critical Appraisal

Confounding

EM FINAL EXAMS Critical Appraisal · Bias & validity Confounding A third variable, linked to both the exposure and the outcome, that…

emfinalexams4 min
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Critical Appraisal

Effect Modification & Interaction

EM FINAL EXAMS Critical Appraisal · Bias & validity Effect Modification & Interaction When a treatment genuinely works differently across subgroups —…

emfinalexams4 min
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Critical Appraisal

Publication Bias & Small-Study Effects

EM FINAL EXAMS Critical Appraisal · Bias & validity Publication Bias & Small-Study Effects Positive trials get published and small trials over-estimate…

emfinalexams3 min
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Critical Appraisal

Risk of Bias Domains

EM FINAL EXAMS Critical Appraisal · Bias & validity Risk of Bias Domains The systematic ways an RCT result can be distorted…

emfinalexams3 min
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Critical Appraisal

Blinding

EM FINAL EXAMS Critical Appraisal · Trial methods Blinding (Masking) Keeping participants, clinicians, outcome assessors and/or analysts unaware of allocation, to stop…

emfinalexams3 min
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Critical Appraisal

Chance vs Bias vs Confounding

EM FINAL EXAMS Critical Appraisal · Bias & validity Chance vs Bias vs Confounding The three alternative explanations you must exclude before…

emfinalexams3 min
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Critical Appraisal

Sampling Methods

EM FINAL EXAMS Critical Appraisal · Trial methods Sampling Methods How participants are SELECTED from the target population — this drives who…

emfinalexams3 min
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Critical Appraisal

Allocation Concealment

EM FINAL EXAMS Critical Appraisal · Trial methods Allocation Concealment Hiding the UPCOMING allocation from whoever enrols and assigns patients, so they…

emfinalexams3 min
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Critical Appraisal

Randomisation Methods

EM FINAL EXAMS Critical Appraisal · Trial methods Randomisation Methods How the allocation sequence is generated — and why this is distinct…

emfinalexams3 min
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Critical Appraisal

Hierarchy of Designs by Question Type

EM FINAL EXAMS Critical Appraisal · Study design Hierarchy of Designs by Question Type The “best” study design is not fixed —…

emfinalexams3 min

Stop reading. Start revising.

Put the strategy into practice with 40,000 explained SBAs and 20 timed mocks.

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