1. A method for improving prediction of patient outcome for a specific patient comprising: obtaining a plurality of patient outcomes and of energy in frequency bands of ECGs for a plurality of prior patients into a database; determining an association of energy in each of the frequency bands with a patient outcome for each of the prior patients using a processor accessing the database; determining the strongest association between energy in one or more of the frequency bands and one of the patient outcomes for each of the prior patients using the processor accessing the database; defining the frequency band with energy with the strongest association with the patient outcome as a diagnostic band for that patient outcome; measuring the energy in the diagnostic frequency band of the specific patient using the processor; and predicting patient outcome for the specific patient in response to energy present in the diagnostic frequency band using the processor.