The asymmetry index (AI) can be used to quantify the differences between measurements of an object on the left side versus its mirror image on the right side.


Measurements should be taken multiple times on each side with a reliable instrument to minimize measurment artifact.


asymmetry index =

= ABSOLUTE((left side measurement) - (right side measurement)) / MINIMUM(left side measurment, right side measuremnt)) * 100


This is equivalent to:


= (((larger of the two measurements) / (smaller of the two measurements)) - 1) * 100



• An asymmetry index of 0 indicates symmetry.

• The larger the index the greater the asymmetry.


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