Critically Appraising the Evidence

Evaluation a report of a study to determine whether it is valid, important and applicable to your question,

Critical Appraisal tools

Critical appraisal worksheets to help you appraise the reliability, importance and applicability of clinical evidence.

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CATMaker and EBM Calculators

Put the “like” into your likelihood ratios with the CEBM’s CATmaker and EBM calculators.

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Number Needed to Treat (NNT)

The Number Needed to Treat (NNT) is the number of patients you need to treat to prevent one additional bad outcome (death, stroke, etc.).

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SpPin and SnNout

To understand what is meant by the terms SpPin and SnNout, we need to understand the notions of sensitivity and specificity.

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Pretest Probability

Pretest Probability is defined as the probability of a patient having the target disorder before a diagnostic test result is known.

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Likelihood Ratios

The Likelihood Ratio (LR) is the likelihood that a given test result would be expected in a patient with the target disorder compared to the likelihood that that same result would be expected in a patient without the target disorder.

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