Comment by saghm

On the other hand, if compressing to a single number is not possible, a doctor will just refuse to give a grade in that way. In my experience, most doctors tend to be very careful about trying to avoid saying anything definitive that they're not actually sure of, even if they're reasonably confident, in large part because part of their job involves understanding how patients react to how things are communicated to them. Being willing to confidently give a misleading answer to a bad question is itself as bad thing when it comes to health data because regular people aren't able to (and shouldn't be expected to) figure out what various interferences from health data happen to feasible from a given data set.