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Question of the week – Statistics

This table shows study results where MRI results where confirmed by arthroscopy:

In terms of this table (A,B,Cand D) please:

  1. Define sensitivity
  2. Define specificity
  3. Define PPV
  4. DefineNPV

Answer:

Be able to draw this table and talk examiner through it as you go. Ensure you leave no room for confusing double negatives.

Sensitivity = True Positive/ True Positive + False Negative

Specificity = True Negative/ True negative + False Positive

Positive Predictive Value = True Positives / True Positives + False Positives

Negative Preditive Value = True Negatives / True Negatives + False Negatives

Note: NPV = C/C+D – error on image

Answer


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FRCS Ortho Team

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