If the CalculationThresholdType is set to threshold_by_number,
the values indicate the absolute number of children that have to
pass a certain severity. Because the Threshold properties are of
the type real, you must use 1.0, 2.0, 3.0, and so on.
If the CalculationThresholdType is set to
threshold_by_percentage, the values are between 0.0 and 1.0. For
example, a single threshold of 25% translates into a value of 0.25
(not 25.0).