Select/filter blocks by scale?

I have a drawing with several thousand instances of a particular block, all of which are at a different scale (all scaled uniformly).

Is there a way that I can select or filter those blocks with a scale greater or less than a certain value?

All help appreciated!

Select the blocks (using Qselect or other means) => QSELECT again (applying the qselect to the 'current selection only') => Select 'block reference' => select scale (x, y, z; in the properties list) => select '>' etc (in the operator drop down list)

QSELECT the blocks by name, then by scale using greater than or less than.