e-journal
Comments on number-needed-to-treat derived from ordinal scales
              A well-known effect size measure in evidence-based medicine is the number-needed-to-treat (NNT)
in order to get one more responder or one more patient with improvement. It is defined as the
reciprocal of the simple risk difference of the two groups being compared (test group with
innovation product and control group). The NNT effect size measure has been largely accepted
in the scientific community. It was thus desirable to develop the NNT for other well-known effect
size measures beyond pure risk differences. It was in this Journal that Kraemer1 advocated using the
Mann–Whitney difference superiority measure P(X            
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