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There are no absolute rules on reporting trial outcomes but there
should always be an attempt to present them in a clinically meaningful
way. This is partly dependent on baseline risk. Other perhaps more
intuitive outcome measures such as number-needed-to-treat or number-needed
-to-screen can be easily calculated by the reader (the reciprocal of
absolute risk reduction) but in itself do not present the full picture.
Ultimately service providers and commissioners want to know how many lives
will be saved by an itervention, how much morbidity will be prevented and
how much it will cost. Every outcome measure on its own can potentially be
misleading, even absolute risk reduction.