Probability scale and qualitative descriptors on which a priori InterVA probabilities are based and a demonstration of how original probabilities were modified to varying degrees.

*No probabilities were made to be “inevitable” or “impossible”.αWhere probabilities could not be increased they were decreased by an equivalent amount.βWhere probabilities could not be decreased they were increased by an equivalent amount.γWhere probabilities could not be increased by the full amount they were increased by as much as possible without violating *.δWhere probabilities could not be decreased by the full amount they were decreased by as much as possible without violating *.