At our clinic we do the 6mwt during the initial intake for the outcome measure and AACVPR certification. I've noticed that some CR programs, respiratory therapists, and physical therapists note a 6mwt norm. For example, a patient would walk 400m and in the note a norm of 450m would be noted based off gender and age. Does anyone else look at 6mwt norms? If so, is there a citation or formula that is used?