Thus when I enter each marker into a logistic regression analysis I can determine the odds ratio for a 1 unit increase in marker levels.

For some markers a 1 unit increase is massive in proportion to the standard deviation whereas for other markers it is negligible.

Is anyone aware of a suitable way that I could transform my data in order to make the odds ratios more meaningful?

I have toyed with the following but each seems to have its limitations:

a). Divide biomarker levels into quintiles/tertiles (thus converting the variable to an ordinal scale)

b). Divide levels of all/selected biomarkers by 10

I noticed in the literature that one group used log-2 of their continuous variables but I wasn't sure how valid this approach would be.

I'd really appreciate any advice/suggestions!